OpenNebula 5.2 Deployment guide Deployment guide
โฆษณา
โฆษณา
OpenNebula 5.2 Deployment guide
Release 5.2.1
OpenNebula Systems
Jan 09, 2017
This document is being provided by OpenNebula Systems under the Creative Commons Attribution-NonCommercial-
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Sunstone Installation & Configuration
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User Security and Authentication
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Configuring Sunstone for Large Deployments
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Raw Device Mapping (RDM) Datastore
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iii
CHAPTER
ONE
CLOUD DESIGN
1.1 Overview
The first step of building a reliable, useful and successful cloud is to decide a clear design. This design needs to be aligned with the expected use of the cloud, and it needs to describe which data center components are going to be part of the cloud. This comprises i) all the infrastructure components such as networking, storage, authorization and virtualization back-ends, as well as the ii) planned dimension of the cloud (characteristics of the workload, numbers of users and so on) and the iii) provisioning workflow, ie, how end users are going to be isolated and using the cloud.
In order to get the most out of a OpenNebula Cloud, we recommend that you create a plan with the features, performance, scalability, and high availability characteristics you want in your deployment. This Chapter provides information to plan an OpenNebula cloud based on
or
vCenter . With this information, you will be able to easily architect
and dimension your deployment, as well as understand the technologies involved in the management of virtualized resources and their relationship.
1.1.1 How Should I Read This Chapter
This is the first Chapter to read, as it introduces the needed concepts to correctly define a cloud architecture.
Within this Chapter, as first step a design of the cloud and its dimension should be drafted. For KVM clouds proceed to
and for vCenter clouds read
Then you could read the
to identify the wanted model to provision resources to end users. In a small installation with a few hosts, you can skip this provisioning model guide and use OpenNebula without giving much thought to infrastructure partitioning and provisioning. But for medium and large deployments you will probably want to provide some level of isolation and structure.
Once the cloud architecture has been designed the next step would be to learn how to install the
1.1.2 Hypervisor Compatibility
Section
Compatibility
This Section applies to KVM.
This Section applies to vCenter.
This Section applies to both KVM and vCenter.
1.2 Open Cloud Architecture
Enterprise cloud computing is the next step in the evolution of data center (DC) virtualization. OpenNebula is a simple but feature-rich and flexible solution to build and manage enterprise clouds and virtualized DCs, that combines existing
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OpenNebula 5.2 Deployment guide, Release 5.2.1
virtualization technologies with advanced features for multi-tenancy, automatic provision and elasticity. OpenNebula follows a bottom-up approach driven by sysadmins, devops and users real needs.
1.2.1 Architectural Overview
OpenNebula assumes that your physical infrastructure adopts a classical cluster-like architecture with a front-end, and a set of hosts where Virtual Machines (VM) will be executed. There is at least one physical network joining all the hosts with the front-end.
A cloud architecture is defined by three components: storage, networking and virtualization. Therefore, the basic components of an OpenNebula system are:
• Front-end that executes the OpenNebula services.
• Hypervisor-enabled hosts that provide the resources needed by the VMs.
• Datastores that hold the base images of the VMs.
• Physical networks used to support basic services such as interconnection of the storage servers and OpenNebula control operations, and VLANs for the VMs.
OpenNebula presents a highly modular architecture that offers broad support for commodity and enterprise-grade hypervisor, monitoring, storage, networking and user management services. This Section briefly describes the different choices that you can make for the management of the different subsystems. If your specific services are not supported we recommend to check the drivers available in the Add-on Catalog . We also provide information and support about how to develop new drivers.
1.2.2 Dimensioning the Cloud
The dimension of a cloud infrastructure can be directly inferred from the expected workload in terms of VMs that the cloud infrastructure must sustain. This workload is also tricky to estimate, but this is a crucial exercise to build an efficient cloud.
The main aspects to take into account at the time of dimensioning the OpenNebula cloud follows.
OpenNebula front-end
The minimum recommended specs are for the OpenNebula front-end are:
Resources Minimum Recommended configuration
Memory 2 GB
CPU 1 CPU (2 cores)
Disk Size
Network
100 GB
2 NICS
1.2. Open Cloud Architecture 2
OpenNebula 5.2 Deployment guide, Release 5.2.1
The maximum number of servers (virtualization hosts) that can be managed by a single OpenNebula instance strongly depends on the performance and scalability of the underlying platform infrastructure, mainly the storage subsystem.
The general recommendation is that no more than 500 servers managed by a single instance, but there are users with
1,000 servers in each zone. Related to this, read the section about
how to tune OpenNebula for large deployments .
KVM nodes
Regarding the dimensions of the KVM virtualization nodes:
• CPU: without overcommitment, each CPU core assigned to a VM must exists as a physical CPU core. By example, for a workload of 40 VMs with 2 CPUs, the cloud will need 80 physical CPUs. These 80 physical
CPUs can be spread among different hosts: 10 servers with 8 cores each, or 5 server of 16 cores each. With overcommitment, however, CPU dimension can be planned ahead, using the CPU and VCPU attributes: CPU states physical CPUs assigned to the VM, while VCPU states virtual CPUs to be presented to the guest OS.
• MEMORY: Planning for memory is straightforward, as by default there is no overcommitment of memory in
OpenNebula. It is always a good practice to count 10% of overhead by the hypervisor (this is not an absolute upper limit, it depends on the hypervisor). So, in order to sustain a VM workload of 45 VMs with 2GB of RAM each, 90GB of physical memory is needed. The number of hosts is important, as each one will incur a 10% overhead due to the hypervisors. For instance, 10 hypervisors with 10GB RAM each will contribute with 9GB each (10% of 10GB = 1GB), so they will be able to sustain the estimated workload. The rule of thumb is having at least 1GB per core, but this also depends on the expected workload.
Storage
It is important to understand how OpenNebula uses storage, mainly the difference between system and image datastore.
• The image datastore is where OpenNebula stores all the images registered that can be used to create VMs, so the rule of thumb is to devote enough space for all the images that OpenNebula will have registered.
• The system datastore is where the VMs that are currently running store their disks. It is trickier to estimate correctly since volatile disks come into play with no counterpart in the image datastore (volatile disks are created on the fly in the hypervisor).
One valid approach is to limit the storage available to users by defining quotas in the number of maximum VMs and also the Max Volatile Storage a user can demand, and ensuring enough system and image datastore space to comply with the limit set in the quotas. In any case, OpenNebula allows cloud administrators to add more system and images datastores if needed.
Dimensioning storage is a critical aspect, as it is usually the cloud bottleneck. It very much depends on the underlying technology. As an example, in Ceph for a medium size cloud at least three servers are needed for storage with 5 disks each of 1TB, 16Gb of RAM, 2 CPUs of 4 cores each and at least 2 NICs.
Network
Networking needs to be carefully designed to ensure reliability in the cloud infrastructure. The recommendation is having 2 NICs in the front-end (public and service) (or 3 NICs depending on the storage backend, access to the storage network may be needed) 4 NICs present in each virtualization node: private, public, service and storage networks.
Less NICs can be needed depending on the storage and networking configuration.
1.2.3 Front-End
The machine that holds the OpenNebula installation is called the front-end. This machine needs network connectivity to all the hosts, and possibly access to the storage Datastores (either by direct mount or network). The base installation of OpenNebula takes less than 150MB.
OpenNebula services include:
• Management daemon (oned) and scheduler (mm_sched)
• Web interface server (sunstone-server)
1.2. Open Cloud Architecture 3
OpenNebula 5.2 Deployment guide, Release 5.2.1
• Advanced components: OneFlow, OneGate, econe, ...
Note: Note that these components communicate through XML-RPC and may be installed in different machines for security or performance reasons
There are several certified platforms to act as front-end for each version of OpenNebula. Refer to the platform notes and chose the one that better fits your needs.
OpenNebula’s default database uses sqlite. If you are planning a production or medium to large scale deployment, you should consider using
If you are interested in setting up a high available cluster for OpenNebula, check the High Availability OpenNebula
Section.
If you need to federate several datacenters, with a different OpenNebula instance managing the resources but needing a common authentication schema, check the Federation Section.
1.2.4 Monitoring
The monitoring subsystem gathers information relative to the hosts and the virtual machines, such as the host status, basic performance indicators, as well as VM status and capacity consumption. This information is collected by executing a set of static probes provided by OpenNebula. The information is sent according to the following process: each host periodically sends monitoring data to the front-end which collects it and processes it in a dedicated module. This model is highly scalable and its limit (in terms of number of VMs monitored per second) is bounded to the performance of the server running oned and the database server.
Please check the
for more details.
1.2.5 Virtualization Hosts
The hosts are the physical machines that will run the VMs. There are several certified platforms to act as nodes for each version of OpenNebula. Refer to the platform notes and chose the one that better fits your needs. The Virtualization
Subsystem is the component in charge of talking with the hypervisor installed in the hosts and taking the actions needed for each step in the VM life-cycle.
OpenNebula natively supports one open source hypervisor, the
hypervisor, and OpenNebula is configured by default to interact with hosts running KVM.
Ideally, the configuration of the nodes will be homogeneous in terms of the software components installed, the oneadmin administration user, accessible storage and network connectivity. This may not always be the case, and homogeneous hosts can be grouped in OpenNebula clusters
If you are interested in fail-over protection against hardware and operating system outages within your virtualized IT environment, check the Virtual Machines High Availability Section.
1.2.6 Storage
OpenNebula uses Datastores to store VMs’ disk images. A datastore is any storage medium, typically backed by
SAN/NAS servers. In general, each datastore has to be accessible through the front-end using any suitable technology
NAS, SAN or direct attached storage.
1.2. Open Cloud Architecture 4
OpenNebula 5.2 Deployment guide, Release 5.2.1
When a VM is deployed, its images are transferred from the datastore to the hosts. Depending on the actual storage technology used, it can mean a real transfer, a symbolic link or setting up an LVM volume.
OpenNebula is shipped with 3 different datastore classes:
• System Datastores: to hold images for running VMs. Depending on the storage technology used, these temporal images can be complete copies of the original image, qcow deltas or simple filesystem links.
• Image Datastores: to store the disk images repository. Disk images are moved, or cloned to/from the System
Datastore when the VMs are deployed or shutdown, or when disks are attached or snapshotted.
•
ramdisks or context files.
Image datastores can be of different types, depending on the underlying storage technology:
•
Filesystem : to store disk images in a file form. There are three types: ssh, shared and qcow.
•
a file-system in place and thus increases performance.
•
Ceph : to store disk images using Ceph block devices.
Warning: Default: The default system and images datastores are configured to use a filesystem with the ssh transfer drivers.
Please check the
for more details.
1.2. Open Cloud Architecture 5
OpenNebula 5.2 Deployment guide, Release 5.2.1
1.2.7 Networking
OpenNebula provides an easily adaptable and customizable network subsystem in order to integrate the specific network requirements of existing datacenters. At least two different physical networks are needed:
• Service Network: used by the OpenNebula front-end daemons to access the hosts in order to manage and monitor the hypervisors, and move image files. It is highly recommended to install a dedicated network for this purpose;
• Instance Network: offers network connectivity to the VMs across the different hosts. To make an effective use of your VM deployments, you will probably need to make one or more physical networks accessible to them.
The OpenNebula administrator may associate one of the following drivers to each Host:
• dummy (default): doesn’t perform any network operation, and firewalling rules are also ignored.
• fw: firewalling rules are applied, but networking isolation is ignored.
•
: restrict network access through VLAN tagging, which requires support by the hardware switches.
•
: restrict network access through Ebtables rules. No special hardware configuration required.
•
ovswitch : restrict network access with
Open vSwitch Virtual Switch .
•
vxlan : segment a VLAN in isolated networks using the VXLAN encapsulation protocol.
Please check the
to find out more information about the networking technologies supported by
OpenNebula.
1.2.8 Authentication
The following authentication methods are supported to access OpenNebula:
• Built-in User/Password
•
•
•
(and Active Directory)
Warning: Default: OpenNebula comes by default with an internal built-in user/password authentication.
Please check the
to find out more information about the authentication technologies supported by OpenNebula.
1.2.9 Advanced Components
Once you have an OpenNebula cloud up and running, you can install the following advanced components:
• Multi-VM Applications and Auto-scaling: OneFlow allows users and administrators to define, execute and manage multi-tiered applications, or services composed of interconnected Virtual Machines with deployment dependencies between them. Each group of Virtual Machines is deployed and managed as a single entity, and is completely integrated with the advanced OpenNebula user and group management.
• Cloud Bursting: Cloud bursting is a model in which the local resources of a Private Cloud are combined with resources from remote Cloud providers. Such support for cloud bursting enables highly scalable hosting environments.
1.2. Open Cloud Architecture 6
OpenNebula 5.2 Deployment guide, Release 5.2.1
• Public Cloud: Cloud interfaces can be added to your Private Cloud if you want to provide partners or external users with access to your infrastructure, or to sell your overcapacity. The following interface provide a simple and remote management of cloud (virtual) resources at a high abstraction level: Amazon EC2 and EBS APIs.
• Application Insight: OneGate allows Virtual Machine guests to push monitoring information to OpenNebula.
Users and administrators can use it to gather metrics, detect problems in their applications, and trigger OneFlow auto-scaling rules.
1.3 VMware Cloud Architecture
OpenNebula is intended for companies willing to create a self-service cloud environment on top of their VMware infrastructure without having to abandon their investment in VMware and retool the entire stack. In these environments,
OpenNebula seamlessly integrates with existing vCenter infrastructures to leverage advanced features -such as vMotion, HA or DRS scheduling- provided by the VMware vSphere product family. OpenNebula exposes a multi-tenant, cloud-like provisioning layer on top of vCenter, including features like virtual data centers, data center federation or hybrid cloud computing to connect in-house vCenter infrastructures with public clouds.
OpenNebula over vCenter is intended for companies that want to keep VMware management tools, procedures and workflows. For these companies, throwing away VMware and retooling the entire stack is not the answer. However, as they consider moving beyond virtualization toward a private cloud, they can choose to either invest more in VMware, or proceed on a tactically challenging but strategically rewarding path of open.
1.3.1 Architectural Overview
OpenNebula assumes that your physical infrastructure adopts a classical cluster-like architecture with a front-end, and a set of vCenter instances grouping ESX hosts where Virtual Machines (VM) will be executed. There is at least one physical network joining all the vCenters and ESX hosts with the front-end. Connection from the front-end to vCenter is for management purposes, whereas the connection from the front-end to the ESX hosts is to support the
VNC connections.
The VMware vCenter drivers enable OpenNebula to access one or more vCenter servers that manages one or more
ESX Clusters. Each ESX Cluster is presented in OpenNebula as an aggregated hypervisor. Note that OpenNebula scheduling decisions are therefore made at ESX Cluster level, vCenter then uses the DRS component to select the actual ESX host and Datastore to deploy the Virtual Machine.
1.3. VMware Cloud Architecture 7
OpenNebula 5.2 Deployment guide, Release 5.2.1
A cloud architecture is defined by three components: storage, networking and virtualization. Therefore, the basic components of an OpenNebula cloud are:
• Front-end that executes the OpenNebula services.
• Hypervisor-enabled hosts that provide the resources needed by the VMs.
• Datastores that hold the base images of the VMs.
• Physical networks used to support basic services such as interconnection of the VMs.
OpenNebula presents a highly modular architecture that offers broad support for commodity and enterprise-grade hypervisor, monitoring, storage, networking and user management services. This Section briefly describes the different choices that you can make for the management of the different subsystems. If your specific services are not supported we recommend to check the drivers available in the Add-on Catalog . We also provide information and support about how to develop new drivers.
1.3.2 Dimensioning the Cloud
The dimension of a cloud infrastructure can be directly inferred from the expected workload in terms of VMs that the cloud infrastructure must sustain. This workload is also tricky to estimate, but this is a crucial exercise to build an efficient cloud.
OpenNebula front-end
The minimum recommended specs are for the OpenNebula front-end are:
1.3. VMware Cloud Architecture 8
OpenNebula 5.2 Deployment guide, Release 5.2.1
Resource Minimum Recommended configuration
Memory 2 GB
CPU 1 CPU (2 cores)
Disk Size 100 GB
Network 2 NICS
When running on a front-end with the minimums described in the above table, OpenNebula is able to manage a vCenter infrastructure of the following characteristics:
• Up to 4 vCenters
• Up to 40 ESXs managed by each vCenter
• Up to 1.000 VMs in total, each vCenter managing up to 250 VMs
ESX nodes
Regarding the dimensions of the ESX virtualization nodes:
• CPU: without overcommitment, each CPU core assigned to a VM must exists as a physical CPU core. By example, for a workload of 40 VMs with 2 CPUs, the cloud will need 80 physical CPUs. These 80 physical
CPUs can be spread among different hosts: 10 servers with 8 cores each, or 5 server of 16 cores each. With overcommitment, however, CPU dimension can be planned ahead, using the CPU and VCPU attributes: CPU states physical CPUs assigned to the VM, while VCPU states virtual CPUs to be presented to the guest OS.
• MEMORY: Planning for memory is straightforward, as by default there is no overcommitment of memory in
OpenNebula. It is always a good practice to count 10% of overhead by the hypervisor (this is not an absolute upper limit, it depends on the hypervisor). So, in order to sustain a VM workload of 45 VMs with 2GB of RAM each, 90GB of physical memory is needed. The number of hosts is important, as each one will incur a 10% overhead due to the hypervisors. For instance, 10 hypervisors with 10GB RAM each will contribute with 9GB each (10% of 10GB = 1GB), so they will be able to sustain the estimated workload. The rule of thumb is having at least 1GB per core, but this also depends on the expected workload.
Storage
Dimensioning storage is a critical aspect, as it is usually the cloud bottleneck. OpenNebula can manage any datastore that is mounted in the ESX and visible in vCenter. The datastore used by a VM can be fixed by the cloud admin or delegated to the cloud user. It is important to ensure that enough space is available for new VMs, otherwise its creation process will fail. One valid approach is to limit the storage available to users by defining quotas in the number of maximum VMs, and ensuring enough datastore space to comply with the limit set in the quotas. In any case,
OpenNebula allows cloud administrators to add more datastores if needed.
Network
Networking needs to be carefully designed to ensure reliability in the cloud infrastructure. The recommendation is having 2 NICs in the front-end (service and public network) 4 NICs present in each ESX node: private, public, service and storage networks. Less NICs can be needed depending on the storage and networking configuration.
1.3.3 Front-End
The machine that holds the OpenNebula installation is called the front-end. This machine needs network connectivity to all the vCenter and ESX hosts. The base installation of OpenNebula takes less than 150MB.
OpenNebula services include:
• Management daemon (oned) and scheduler (mm_sched)
• Web interface server (sunstone-server)
• Advanced components: OneFlow, OneGate, econe, ...
1.3. VMware Cloud Architecture 9
OpenNebula 5.2 Deployment guide, Release 5.2.1
Note: Note that these components communicate through XML-RPC and may be installed in different machines for security or performance reasons
There are several certified platforms to act as front-end for each version of OpenNebula. Refer to the platform notes and chose the one that better fits your needs.
OpenNebula’s default database uses sqlite. If you are planning a production or medium to large scale deployment, you should consider using
If you are interested in setting up a high available cluster for OpenNebula, check the High Availability OpenNebula
Section.
1.3.4 Monitoring
The monitoring subsystem gathers information relative to the hosts and the virtual machines, such as the host status, basic performance indicators, as well as VM status and capacity consumption. This information is collected by executing a set of probes in the front-end provided by OpenNebula.
Please check the
for more details.
1.3.5 Virtualization Hosts
The VMware vCenter drivers enable OpenNebula to access one or more vCenter servers that manages one or more ESX
Clusters. Each ESX Cluster is presented in OpenNebula as an aggregated hypervisor. The Virtualization Subsystem is the component in charge of talking with vCenter and taking the actions needed for each step in the VM life-cycle.
All the management operations are issued by the front-end to vCenter, except the VNC connection that is performed directly from the front-end to the ESX where a particular VM is running.
OpenNebula natively supports
hypervisor, vCenter drivers need to be configured in the OpenNebula front-end.
If you are interested in fail-over protection against hardware and operating system outages within your virtualized IT environment, check the Virtual Machines High Availability Section.
1.3.6 Storage
OpenNebula interacts as a consumer of vCenter storage, and as such, supports all the storage devices supported by
ESX . When a VM is instantiated from a VM Template, the datastore associated with the VM template is chosen. If
DRS is enabled, then vCenter will pick the optimal Datastore to deploy the VM. Alternatively, the datastore used by a
VM can be fixed by the cloud admin or delegated to the cloud user.
vCenter/ESX Datastores can be represented in OpenNebula to create, clone and/or upload VMDKs. The vCenter/ESX datastore representation in OpenNebula is described in the
1.3.7 Networking
Networking in OpenNebula is handled by creating or importing Virtual Network representations of vCenter Networks and Distributed vSwitches. In this way, new VMs with defined network interfaces will be bound by OpenNebula to these Networks and/or Distributed vSwitches. OpenNebula can create a new logical layer of these vCenter Networks and Distributed vSwitches, in particular three types of Address Ranges can be defined per Virtual Network representing the vCenter network resources: plain Ethernet, IPv4 and IPv6. This networking information can be passed to the VMs through the contextualization process.
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Please check the
to find out more information about the networking support in vCenter infrastructures by OpenNebula.
1.3.8 Authentication
The following authentication methods are supported to access OpenNebula:
• Built-in User/Password
•
•
•
(and Active Directory)
Warning: Default: OpenNebula comes by default with an internal built-in user/password authentication.
Please check the
to find out more information about the authentication technologies supported by OpenNebula.
1.3.9 Multi-Datacenter Deployments
OpenNebula interacts with the vCenter instances by interfacing with its SOAP API exclusively. This characteristic enables architectures where the OpenNebula instance and the vCenter environment are located in different datacenters.
A single OpenNebula instances can orchestrate several vCenter instances remotely located in different data centers.
Connectivity between data centers needs to have low latency in order to have a reliable management of vCenter from
OpenNebula.
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When administration domains need to be isolated or the interconnection between datacenters does not allow a single controlling entity, OpenNebula can be configured in a federation. Each OpenNebula instance of the federation is called a Zone, one of them configured as master and the others as slaves. An OpenNebula federation is a tightly coupled integration, all the instances will share the same user accounts, groups, and permissions configuration. Federation allows end users to consume resources allocated by the federation administrators regardless of their geographic location. The integration is seamless, meaning that a user logged into the Sunstone web interface of a Zone will not have to log out and enter the address of another Zone. Sunstone allows to change the active Zone at any time, and it will automatically redirect the requests to the right OpenNebula at the target Zone. For more information, check the Federation Section.
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1.3.10 Advanced Components
Once you have an OpenNebula cloud up and running, you can install the following advanced components:
• Multi-VM Applications and Auto-scaling: OneFlow allows users and administrators to define, execute and manage services composed of interconnected Virtual Machines with deployment dependencies between them.
Each group of Virtual Machines is deployed and managed as a single entity, and is completely integrated with the advanced OpenNebula user and group management.
• Cloud Bursting: Cloud bursting is a model in which the local resources of a Private Cloud are combined with resources from remote Cloud providers. Such support for cloud bursting enables highly scalable hosting environments.
• Public Cloud: Cloud interfaces can be added to your Private Cloud if you want to provide partners or external users with access to your infrastructure, or to sell your overcapacity. The following interface provide a simple and remote management of cloud (virtual) resources at a high abstraction level: Amazon EC2 and EBS APIs.
• Application Insight: OneGate allows Virtual Machine guests to push monitoring information to OpenNebula.
Users and administrators can use it to gather metrics, detect problems in their applications, and trigger OneFlow auto-scaling rules.
1.4 OpenNebula Provisioning Model
In a small installation with a few hosts, you can use OpenNebula without giving much thought to infrastructure partitioning and provisioning. But for medium and large deployments you will probably want to provide some level of isolation and structure.
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This Section is meant for cloud architects, builders and administrators, to help them understand the OpenNebula model for managing and provisioning virtual resources. This model is a result of our collaboration with our user community throughout the life of the project.
1.4.1 The Infrastructure Perspective
Common large IT shops have multiple Data Centers (DCs), each one running its own OpenNebula instance and consisting of several physical Clusters of infrastructure resources (Hosts, Networks and Datastores). These Clusters could present different architectures and software/hardware execution environments to fulfill the needs of different workload profiles. Moreover, many organizations have access to external public clouds to build hybrid cloud scenarios where the private capacity of the Data Centers is supplemented with resources from external clouds, like Amazon
AWS, to address peaks of demand.
For example, you could have two Data Centers in different geographic locations, Europe and USA West Coast, and an agreement for cloudbursting with a public cloud provider, such as Amazon, and/or Azure. Each Data Center runs its own zone or full OpenNebula deployment. Multiple OpenNebula Zones can be configured as a federation, and in this case they will share the same user accounts, groups, and permissions across Data Centers.
1.4.2 The Organizational Perspective
Users are organized into Groups (similar to what other environments call Projects, Domains, Tenants...). A Group is an authorization boundary that can be seen as a business unit if you are considering it as a private cloud or as a complete new company if it is a public cloud. While Clusters are used to group Physical Resources according to common characteristics such as networking topology or physical location, Virtual Data Centers (VDCs) allow to create
“logical” pools of Physical Resources (which could belong to different Clusters and Zones) and allocate them to user
Groups.
A VDC is a fully-isolated virtual infrastructure environment where a Group of users (or optionally several Groups of users), under the control of a Group admin, can create and manage compute and storage capacity. The users in the
Group, including the Group admin, would only see the virtual resources and not the underlying physical infrastructure. The Physical Resources allocated to the Group are managed by the cloud administrator through a VDC. These resources grouped in the VDC can be dedicated exclusively to the Group, providing isolation at the physical level too.
The privileges of the Group users and the admin regarding the operations over the virtual resources created by other users can be configured. For example, in the Advanced Cloud Provisioning Case described below, the users can instantiate virtual machine templates to create their machines, while the admins of the Group have full control over other users’ resources and can also create new users in the Group.
Users can access their resources through any of the existing OpenNebula interfaces, such as the CLI, Sunstone Cloud
View, OCA, or the AWS APIs. Group admins can manage their Groups through the CLI or the Group Admin View in
Sunstone. Cloud administrators can manage the Groups through the CLI or Sunstone.
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The Cloud provisioning model based on VDCs enables an integrated, comprehensive framework to dynamically provision the infrastructure resources in large multi-datacenter environments to different customers, business units or groups. This brings several benefits:
• Partitioning of cloud Physical Resources between Groups of users
• Complete isolation of Users, organizations or workloads
• Allocation of Clusters with different levels of security, performance or high availability
• Containers for the execution of software-defined data centers
• Way of hiding Physical Resources from Group members
• Simple federation, scalability and cloudbursting of private cloud infrastructures beyond a single cloud instance and data center
1.4.3 Examples of Provisioning Use Cases
The following are common enterprise use cases in large cloud computing deployments:
• On-premise Private Clouds Serving Multiple Projects, Departments, Units or Organizations. On-premise private clouds in large organizations require powerful and flexible mechanisms to manage the access privileges to the virtual and physical infrastructure and to dynamically allocate the available resources. In these scenarios, the Cloud Administrator would define a VDC for each Department, dynamically allocating resources according to their needs, and delegating the internal administration of the Group to the Department IT Administrator.
• Cloud Providers Offering Virtual Private Cloud Computing. Cloud providers providing customers with a fullyconfigurable and isolated environment where they have full control and capacity to administer its users and resources. This combines a public cloud with the control usually seen in a personal private cloud system.
For example, you can think Web Development, Human Resources, and Big Data Analysis as business units represented by Groups in a private OpenNebula cloud, and allocate them resources from your DCs and public clouds in order to create three different VDCs.
• VDC BLUE: VDC that allocates (ClusterA-DC_West_Coast + Cloudbursting) to Web Development
• VDC RED: VDC that allocates (ClusterB-DC_West_Coast + ClusterA-DC_Europe + Cloudbursting) to Human
Resources
• VDC GREEN: VDC that allocates (ClusterC-DC_West_Coast + ClusterB-DC_Europe) to Big Data Analysis
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1.4.4 Cloud Provisioning Scenarios
OpenNebula has three predefined User roles to implement three typical enterprise cloud scenarios:
• Data center infrastructure management
• Simple cloud provisioning model
• Advanced cloud provisioning model
In these three scenarios, Cloud Administrators manage the physical infrastructure, creates Users and VDCs, prepares base templates and images for Users, etc
Cloud Administrators typically access the cloud using the CLI or the Admin View of Sunstone.
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Role
Cloud Admin.
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Capabilities
• Operates the Cloud infrastructure (i.e. computing nodes, networking fabric, storage servers)
• Creates and manages OpenNebula infrastructure resources: Hosts, Virtual Networks, Datastores
• Creates and manages Multi-VM Applications
(Services)
• Creates new Groups and VDCs
• Assigns Groups and physical resources to a VDC and sets quota limits
• Defines base instance types to be used by the users. These types define the capacity of the VMs
(memory, cpu and additional storage) and connectivity.
• Prepare VM images to be used by the users
• Monitor the status and health of the cloud
• Generate activity reports
Data Center Infrastructure Management
This model is used to manage data center virtualization and to integrate and federate existing IT assets that can be in different data centers. In this usage model, Users are familiar with virtualization concepts. Except for the infrastructure resources, the web interface offers the same operations available to the Cloud Admin. These are “Advanced Users” that could be considered also as “Limited Cloud Administrators”.
Users can use the templates and images pre-defined by the cloud administrator, but usually are also allowed to create their own templates and images. They are also able to manage the life-cycle of their resources, including advanced features that may harm the VM guests, like hot-plugging of new disks, resize of Virtual Machines, modify boot parameters, etc.
Groups are used by the Cloud Administrator to isolate users, which are combined with VDCs to have allocated resources, but are not offered on-demand.
These “Advanced Users” typically access the cloud by using the CLI or the User View of Sunstone. This is not the default model configured for the group Users.
Role
Advanced User
Capabilities
• Instantiates VMs using their own templates
• Creates new templates and images
• Manages their VMs, including advanced lifecycle features
• Creates and manages Multi-VM Application
(Services)
• Check their usage and quotas
• Upload SSH keys to access the VMs
Simple Cloud Provisioning
In the simple infrastructure provisioning model, the Cloud offers infrastructure as a service to individual Users. Users are considered as “Cloud Users” or “Cloud Consumers”, being much more limited in their operations. These Users access a very intuitive simplified web interface that allows them to launch Virtual Machines from predefined Templates.
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They can access their VMs, and perform basic operations like shutdown. The changes made to a VM disk can be saved back, but new Images cannot be created from scratch.
Groups are used by the Cloud Administrator to isolate users, which are combined with VDCs to have allocated resources, but are not offered on-demand.
These “Cloud Users” typically access the cloud by using the Cloud View of Sunstone. This is the default model configured for the group Users.
Role
Cloud User
Capabilities
• Instantiates VMs using the templates defined by the Cloud Admins and the images defined by the
Cloud Admins or Group Admins.
• Instantiates VMs using their own Images saved from a previous running VM
• Manages their VMs, including
– reboot
– power off/on (short-term switching-off)
– delete
– save a VM into a new Template
– obtain basic monitor information and status
(including IP addresses)
• Delete any previous VM template and disk snapshot
• Check user account usage and quotas
• Upload SSH keys to access the VMs
Advanced Cloud Provisioning
The advanced provisioning model is an extension of the previous one where the cloud provider offers VDCs on demand to Groups of Users (projects, companies, departments or business units). Each Group can define one or more users as
Group Admins. These admins can create new users inside the Group, and also manage the resources of the rest of the users. A Group Admin may, for example, shutdown a VM from other user to free group quota usage.
These Group Admins typically access the cloud by using the Group Admin View of Sunstone.
The Group Users have the capabilities described in the previous scenario and typically access the cloud by using the
Cloud View of Sunstone.
Role
Group Admin.
Capabilities
• Creates new users in the Group
• Operates on the Group’s virtual machines and disk images
• Share Saved Templates with the members of the
Group
• Checks Group usage and quotas
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CHAPTER
TWO
OPENNEBULA INSTALLATION
2.1 Overview
The Front-end is the central part of an OpenNebula installation. This is the machine where the server software is installed and where you connect to manage your cloud. It can be a physical node or a Virtual Machine.
2.1.1 How Should I Read This Chapter
Before reading this chapter make sure you have read and understood the
chapter.
The aim of this chapter is to give you a quick-start guide to deploy OpenNebula. This is the simplest possible installation, but it is also the foundation for a more complex setup, with Advanced Components (like Host and VM High
Availability, Cloud Bursting, etc...).
First you should read the
section. Note that by default it uses a SQLite database that is not recommended for production so, if this is not a small proof of concept, while following the Installation section, you should enable
After reading this chapter, read the
chapter next in order to add hypervisors to your cloud.
2.1.2 Hypervisor Compatibility
Section Compatibility
This Section applies to both KVM and vCenter.
Scheduler
This Section applies to both KVM and vCenter.
This Section applies to both KVM and vCenter.
2.2 Front-end Installation
This page shows you how to install OpenNebula from the binary packages.
Using the packages provided in our site is the recommended method, to ensure the installation of the latest version and to avoid possible packages divergences of different distributions. There are two alternatives here: you can add our package repositories to your system, or visit the software menu to download the latest package for your Linux distribution.
If there are no packages for your distribution, head to the Building from Source Code guide.
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2.2.1 Step 1. Disable SElinux in CentOS/RHEL 7
SElinux can cause some problems, like not trusting oneadmin user’s SSH credentials. You can disable it changing in the file /etc/selinux/config this line:
SELINUX = disabled
After this file is changed reboot the machine.
2.2.2 Step 2. Add OpenNebula Repositories
CentOS/RHEL 7
To add OpenNebula repository execute the following as root:
# cat << EOT > /etc/yum.repos.d/opennebula.repo
[opennebula] name=opennebula baseurl=http://downloads.opennebula.org/repo/5.2/CentOS/7/x86_64 enabled=1 gpgcheck=0
EOT
Debian/Ubuntu
To add OpenNebula repository on Debian/Ubuntu execute as root:
# wget -q -O- http://downloads.opennebula.org/repo/Debian/repo.key | apt-key add -
Debian 8
# echo "deb http://downloads.opennebula.org/repo/5.2/Debian/8 stable opennebula" > /etc/apt/sources.list.d/opennebula.list
Ubuntu 14.04
# echo "deb http://downloads.opennebula.org/repo/5.2/Ubuntu/14.04 stable opennebula" > /etc/apt/sources.list.d/opennebula.list
Ubuntu 16.04
# echo "deb http://downloads.opennebula.org/repo/5.2/Ubuntu/16.04 stable opennebula" > /etc/apt/sources.list.d/opennebula.list
2.2.3 Step 3. Installing the Software
Installing on CentOS/RHEL 7
Before installing:
• Activate the EPEL repo. In CentOS this can be done with the following command:
# yum install epel-release
There are packages for the Front-end, distributed in the various components that conform OpenNebula, and packages for the virtualization host.
To install a CentOS/RHEL OpenNebula Front-end with packages from our repository, execute the following as root.
# yum install opennebula-server opennebula-sunstone opennebula-ruby opennebula-gate
˓→ opennebula-flow
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CentOS/RHEL Package Description
These are the packages available for this distribution:
• opennebula: Command Line Interface.
• opennebula-server: Main OpenNebula daemon, scheduler, etc.
• opennebula-sunstone:
(the GUI) and the EC2 API.
• opennebula-ruby: Ruby Bindings.
• opennebula-java: Java Bindings.
• opennebula-gate: OneGate server that enables communication between VMs and OpenNebula.
• opennebula-flow: OneFlow manages services and elasticity.
• opennebula-node-kvm: Meta-package that installs the oneadmin user, libvirt and kvm.
• opennebula-common: Common files for OpenNebula packages.
Note: The files located in /etc/one and /var/lib/one/remotes are marked as configuration files.
Installing on Debian/Ubuntu
To install OpenNebula on a Debian/Ubuntu Front-end using packages from our repositories execute as root:
# apt-get update
# apt-get install opennebula opennebula-sunstone opennebula-gate opennebula-flow
Debian/Ubuntu Package Description
These are the packages available for these distributions:
• opennebula-common: Provides the user and common files.
• ruby-opennebula: Ruby API.
• libopennebula-java: Java API.
• libopennebula-java-doc: Java API Documentation.
• opennebula-node: Prepares a node as an opennebula-node.
• opennebula-sunstone:
(the GUI).
• opennebula-tools: Command Line interface.
• opennebula-gate: OneGate server that enables communication between VMs and OpenNebula.
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• opennebula-flow: OneFlow manages services and elasticity.
• opennebula: OpenNebula Daemon.
Note: Besides /etc/one, the following files are marked as configuration files:
• /var/lib/one/remotes/datastore/ceph/ceph.conf
• /var/lib/one/remotes/vnm/OpenNebulaNetwork.conf
2.2.4 Step 4. Ruby Runtime Installation
Some OpenNebula components need Ruby libraries. OpenNebula provides a script that installs the required gems as well as some development libraries packages needed.
As root execute:
# /usr/share/one/install_gems
The previous script is prepared to detect common Linux distributions and install the required libraries. If it fails to find the packages needed in your system, manually install these packages:
• sqlite3 development library
• mysql client development library
• curl development library
• libxml2 and libxslt development libraries
• ruby development library
• gcc and g++
• make
If you want to install only a set of gems for an specific component read Building from Source Code where it is explained in more depth.
2.2.5 Step 5. Enabling MySQL/MariaDB (Optional)
You can skip this step if you just want to deploy OpenNebula as quickly as possible. However if you are deploying this for production or in a more serious environment, make sure you read the
section.
Note that it is possible to switch from SQLite to MySQL, but since it’s more cumbersome to migrate databases, we suggest that if in doubt, use MySQL from the start.
2.2.6 Step 6. Starting OpenNebula
Log in as the oneadmin user follow these steps:
The /var/lib/one/.one/one_auth fill will have been created with a randomly-generated password. It should contain the following: oneadmin:<password>. Feel free to change the password before starting OpenNebula.
For example:
$ echo "oneadmin:mypassword" > ~/.one/one_auth
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Warning: This will set the oneadmin password on the first boot. From that point, you must use the oneuser passwd command to change oneadmin’s password.
You are ready to start the OpenNebula daemons. You can use systemctl for Linux distributions which have adopted systemd:
# systemctl start opennebula
# systemctl start opennebula-sunstone
Or use service in older Linux systems:
# service opennebula start
# service opennebula-sunstone start
2.2.7 Step 7. Verifying the Installation
After OpenNebula is started for the first time, you should check that the commands can connect to the OpenNebula daemon. You can do this in the Linux CLI or in the graphical user interface: Sunstone.
Linux CLI
In the Front-end, run the following command as oneadmin:
$ oneuser show
USER 0 INFORMATION
ID : 0
NAME : oneadmin
GROUP
PASSWORD
AUTH_DRIVER
ENABLED
: oneadmin
: 3bc15c8aae3e4124dd409035f32ea2fd6835efc9
: core
: Yes
USER TEMPLATE
TOKEN_PASSWORD = "ec21d27e2fe4f9ed08a396cbd47b08b8e0a4ca3c"
RESOURCE USAGE & QUOTAS
If you get an error message, then the OpenNebula daemon could not be started properly:
$ oneuser show
Failed to open TCP connection to localhost:2633 ( Connection refused - connect ( 2 )
for
˓→
"localhost" port 2633 )
The OpenNebula logs are located in /var/log/one, you should have at least the files oned.log and sched.
log
, the core and scheduler logs. Check oned.log for any error messages, marked with [E].
Sunstone
Now you can try to log in into Sunstone web interface.
To do this point your browser to http://
<fontend_address>:9869 . If everything is OK you will be greeted with a login page. The user is oneadmin and the password is the one in the file /var/lib/one/.one/one_auth in your Front-end.
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If the page does not load, make sure you check /var/log/one/sunstone.log and /var/log/one/ sunstone.error
. Also, make sure TCP port 9869 is allowed through the firewall.
Directory Structure
The following table lists some notable paths that are available in your Front-end after the installation:
Path
/etc/one/
/var/log/one/
Description
Configuration Files
Log files, notably: oned.log, sched.log, sunstone.log and
/var/lib/one/
/var/lib/one/datastores/
<dsid>/
Storage for the datastores
/var/lib/one/vms/<vmid>/
Action files for VMs (deployment file, transfer manager scripts, etc...)
/var/lib/one/.one/one_auth oneadmin credentials
/var/lib/one/remotes/
/var/lib/one/remotes/ hooks/
<vmid>.log
oneadmin home directory
Probes and scripts that will be synced to the Hosts
Hook scripts
/var/lib/one/remotes/vmm/ Virtual Machine Manager Driver scripts
/var/lib/one/remotes/auth/
Authentication Driver scripts
/var/lib/one/remotes/im/
/var/lib/one/remotes/ market/
Information Manager (monitoring) Driver scripts
MarketPlace Driver scripts
/var/lib/one/remotes/ datastore/
Datastore Driver scripts
/var/lib/one/remotes/vnm/
/var/lib/one/remotes/tm/
Networking Driver scripts
Transfer Manager Driver scripts
2.2.8 Step 8. Next steps
Now that you have successfully started your OpenNebula service, head over to the
chapter in order to add hypervisors to your cloud.
2.3 MySQL Setup
The MySQL/MariaDB back-end is an alternative to the default SQLite back-end. In this guide and in the rest of Open-
Nebula’s documentation and configuration files we will refer to this database as the MySQL, however OpenNebula you can use either MySQL or MariaDB.
The two back-ends cannot coexist (SQLite and MySQL), and you will have to decide which one is going to be used while planning your OpenNebula installation.
Note: If you are planning to install OpenNebula with MySQL back-end, please follow this guide prior to start
OpenNebula the first time to avoid problems with oneadmin and serveradmin credentials.
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2.3.1 Installation
First of all, you need a working MySQL server. You can either deploy one for the OpenNebula installation or reuse any existing MySQL already deployed and accessible by the Front-end.
Configuring MySQL
You need to add a new user and grant it privileges on the opennebula database. This new database doesn’t need to exist, OpenNebula will create it the first time you run it.
Assuming you are going to use the default values, log in to your MySQL server and issue the following commands:
$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor. [...] mysql> GRANT ALL PRIVILEGES ON opennebula.* TO 'oneadmin' IDENTIFIED BY '<thepassword>
˓→
';
Query OK, 0 rows affected (0.00 sec)
Visit the MySQL documentation to learn how to manage accounts.
Now configure the transaction isolation level: mysql > SET GLOBAL TRANSACTION ISOLATION LEVEL READ COMMITTED;
Configuring OpenNebula
Before you run OpenNebula for the first time, you need to set in
the connection details, and the database you have granted privileges on.
# Sample configuration for MySQL
DB = [ backend = "mysql" , server = "localhost" , port = 0 , user = "oneadmin" , passwd = "<thepassword>" , db_name = "opennebula" ]
Fields:
• server: URL of the machine running the MySQL server.
• port: port for the connection to the server. If set to 0, the default port is used.
• user: MySQL user-name.
• passwd: MySQL password.
• db_name: Name of the MySQL database OpenNebula will use.
2.3.2 Using OpenNebula with MySQL
After this installation and configuration process you can use OpenNebula as usual.
2.3. MySQL Setup 25
CHAPTER
THREE
NODE INSTALLATION
3.1 Overview
After OpenNebula Front-end is correctly setup the next step is preparing the hosts where the VMs are going to run.
3.1.1 How Should I Read This Chapter
Make sure you have properly
before reading this chapter.
This chapter focuses on the minimal node installation you need to follow in order to finish deploying OpenNebula.
Concepts like storage and network have been simplified. Therefore feel free to follow the other specific chapters in order to configure other subsystems like networking and storage.
Note that you can follow this chapter without reading any other guides and you will be ready, by the end of it, to deploy a Virtual Machine. If in the future you want to switch to other storage or networking technologies you will be able to do so.
After installing the nodes and
verifying your installation , you can either start using your cloud or configure more
components:
•
. (Optional) For integrating OpenNebula with LDAP/AD, or securing it further with other authen-
tication technologies.
•
about specific enhanced configurations for Sunstone.
If your cloud is KVM based you should also follow:
•
•
•
Otherwise, if it’s VMware based:
• Head over to the
chapter.
3.1.2 Hypervisor Compatibility
Section
Compatibility
This Section applies to KVM.
This Section applies to vCenter.
This Section applies to both vCenter and KVM.
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3.2 KVM Node Installation
This page shows you how to install OpenNebula from the binary packages.
Using the packages provided in our site is the recommended method, to ensure the installation of the latest version and to avoid possible packages divergences of different distributions. There are two alternatives here: you can add our package repositories to your system, or visit the software menu to download the latest package for your Linux distribution.
3.2.1 Step 1. Add OpenNebula Repositories
CentOS/RHEL 7
To add OpenNebula repository execute the following as root:
# cat << EOT > /etc/yum.repos.d/opennebula.repo
[opennebula] name=opennebula baseurl=http://downloads.opennebula.org/repo/5.2/CentOS/7/x86_64 enabled=1 gpgcheck=0
EOT
Debian/Ubuntu
To add OpenNebula repository on Debian/Ubuntu execute as root:
# wget -q -O- http://downloads.opennebula.org/repo/Debian/repo.key | apt-key add -
Debian 8
# echo "deb http://downloads.opennebula.org/repo/5.2/Debian/8 stable opennebula" > /etc/apt/sources.list.d/opennebula.list
Ubuntu 14.04
# echo "deb http://downloads.opennebula.org/repo/5.2/Ubuntu/14.04 stable opennebula" > /etc/apt/sources.list.d/opennebula.list
Ubuntu 16.04
# echo "deb http://downloads.opennebula.org/repo/5.2/Ubuntu/16.04 stable opennebula" > /etc/apt/sources.list.d/opennebula.list
3.2.2 Step 2. Installing the Software
Installing on CentOS/RHEL
Execute the following commands to install the node package and restart libvirt to use the OpenNebula provided configuration file:
$ sudo yum install opennebula-node-kvm
$ sudo service libvirtd restart
For further configuration, check the specific guide:
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Installing on Debian/Ubuntu
Execute the following commands to install the node package and restart libvirt to use the OpenNebula provided configuration file:
$ sudo apt-get install opennebula-node
$ sudo service libvirtd restart # debian
$ sudo service libvirt-bin restart # ubuntu
For further configuration check the specific guide:
3.2.3 Step 3. Disable SElinux in CentOS/RHEL 7
SElinux can cause some problems, like not trusting oneadmin user’s SSH credentials. You can disable it changing in the file /etc/selinux/config this line:
SELINUX = disabled
After this file is changed reboot the machine.
3.2.4 Step 4. Configure Passwordless SSH
OpenNebula Front-end connects to the hypervisor Hosts using SSH. You must distribute the public key of oneadmin user from all machines to the file /var/lib/one/.ssh/authorized_keys in all the machines. There are many methods to achieve the distribution of the SSH keys, ultimately the administrator should choose a method (the recommendation is to use a configuration management system). In this guide we are going to manually scp the SSH keys.
When the package was installed in the Front-end, an SSH key was generated and the authorized_keys populated.
We will sync the id_rsa, id_rsa.pub and authorized_keys from the Front-end to the nodes. Additionally we need to create a known_hosts file and sync it as well to the nodes. To create the known_hosts file, we have to execute this command as user oneadmin in the Front-end with all the node names and the Front-end name as parameters:
$ ssh-keyscan <frontend> <node1> <node2> <node3> ... >> /var/lib/one/.ssh/known_hosts
Now we need to copy the directory /var/lib/one/.ssh to all the nodes. The easiest way is to set a temporary password to oneadmin in all the hosts and copy the directory from the Front-end:
$ scp -rp /var/lib/one/.ssh <node1>:/var/lib/one/
$ scp -rp /var/lib/one/.ssh <node2>:/var/lib/one/
$ scp -rp /var/lib/one/.ssh <node3>:/var/lib/one/
$ ...
You should verify that connecting from the Front-end, as user oneadmin, to the nodes and the Front-end itself, and from the nodes to the Front-end, does not ask password:
$ ssh <frontend>
$ exit
$ ssh <node1>
$ ssh <frontend>
$ exit
$ exit
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$ ssh <node2>
$ ssh <frontend>
$ exit
$ exit
$ ssh <node3>
$ ssh <frontend>
$ exit
$ exit
3.2.5 Step 5. Networking Configuration
OpenNebula 5.2 Deployment guide, Release 5.2.1
A network connection is needed by the OpenNebula Front-end daemons to access the hosts to manage and monitor the Hosts, and to transfer the Image files. It is highly recommended to use a dedicated network for this purpose.
There are various network models (please check the
chapter to find out the networking technologies supported by OpenNebula).
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You may want to use the simplest network model that corresponds to the
drivers. For this driver, you will need to setup a linux bridge and include a physical device to the bridge. Later on, when defining the network in
OpenNebula, you will specify the name of this bridge and OpenNebula will know that it should connect the VM to this bridge, thus giving it connectivity with the physical network device connected to the bridge. For example, a typical host with two physical networks, one for public IP addresses (attached to an eth0 NIC for example) and the other for private virtual LANs (NIC eth1 for example) should have two bridges:
$ brctl show bridge name bridge id br0
STP enabled interfaces
8000.001e682f02ac no eth0 br1 8000.001e682f02ad no eth1
Note: Remember that this is only required in the Hosts, not in the Front-end. Also remember that it is not important the exact name of the resources (br0, br1, etc...), however it’s important that the bridges and NICs have the same name in all the Hosts.
3.2.6 Step 6. Storage Configuration
You can skip this step entirely if you just want to try out OpenNebula, as it will come configured by default in such a way that it uses the local storage of the Front-end to store Images, and the local storage of the hypervisors as storage for the running VMs.
However, if you want to set-up another storage configuration at this stage, like Ceph, NFS, LVM, etc, you should read the
chapter.
3.2.7 Step 8. Adding a Host to OpenNebula
In this step we will register the node we have installed in the OpenNebula Front-end, so OpenNebula can launch VMs in it. This step can be done in the CLI or in Sunstone, the graphical user interface. Follow just one method, not both, as they accomplish the same.
To learn more about the host subsystem, read this guide.
Adding a Host through Sunstone
Open the Sunstone as documented
here . In the left side menu go to Infrastructure -> Hosts. Click on the + button.
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The fill-in the fqdn of the node in the Hostname field.
Finally, return to the Hosts list, and check that the Host switch to ON status. It should take somewhere between 20s to
1m. Try clicking on the refresh button to check the status more frequently.
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If the host turns to err state instead of on, check the /var/log/one/oned.log. Chances are it’s a problem with the SSH!
Adding a Host through the CLI
To add a node to the cloud, run this command as oneadmin in the Front-end:
$ onehost create <node01> -i kvm -v kvm
$ onehost list
ID NAME
1 localhost
CLUSTER default
# After some time (20s - 1m)
$ onehost list
ID NAME
0 node01
CLUSTER default
RVM
0
RVM
0
ALLOCATED_CPU
-
ALLOCATED_CPU
0 / 400 ( 0% )
ALLOCATED_MEM STAT
- init
ALLOCATED_MEM STAT
0K / 7.7G
( 0% ) on
If the host turns to err state instead of on, check the /var/log/one/oned.log. Chances are it’s a problem with the SSH!
3.2.8 Step 8. Import Currently Running VMs (Optional)
You can skip this step as importing VMs can be done at any moment, however, if you wish to see your previously deployed VMs in OpenNebula you can use the import VM functionality.
3.2.9 Step 9. Next steps
You can now jump to the optional
section in order to get to launch a test VM.
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Otherwise, you are ready to start using your cloud or you could configure more components:
•
tication technologies.
•
learn about specific enhanced configurations for Sunstone.
If your cloud is KVM based you should also follow:
•
•
•
If it’s VMware based:
• Head over to the
chapter.
3.3 vCenter Node Installation
This Section lays out the requirements configuration needed in the vCenter and ESX instances in order to be managed by OpenNebula.
The VMware vCenter drivers enable OpenNebula to access one or more vCenter servers that manages one or more
ESX Clusters. Each ESX Cluster is presented in OpenNebula as an aggregated hypervisor, i.e. as an OpenNebula
Host. This means that the representation is one OpenNebula Host per ESX Cluster.
Note that OpenNebula scheduling decisions are therefore made at ESX Cluster level, vCenter then uses the DRS component to select the actual ESX host and Datastore to deploy the Virtual Machine, although the datastore can be explicitly selected from OpenNebula.
3.3.1 Requirements
The following must be met for a functional vCenter environment:
• vCenter 5.5 and/or 6.0, with at least one cluster aggregating at least one ESX 5.5 and/or 6.0 host.
• VMware tools are needed in the guestOS to enable several features (contextualization and networking feedback).
Please install VMware Tools (for Windows) or Open Virtual Machine Tools (for *nix) in the guestOS.
• Define a vCenter user for OpenNebula. This vCenter user (let’s call her oneadmin) needs to have access to the
ESX clusters that OpenNebula will manage. In order to avoid problems, the hassle free approach is to declare this oneadmin user as Administrator.
• Alternatively, in some enterprise environments declaring the user as Administrator is not allowed, in that case, you will need to grant these permissions (please note that the following permissions related to operations are related to the use that OpenNebula does with this operations):
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vCenter
Operation
Privileges Notes
Recon-
PowerOffVM_Task
Destroy_Task
VirtualMachine.Interact.DeviceConnection
VirtualMachine.Config.Rename VirtualMachine.Config.Annotation
VirtualMachine.Config.AddExistingDisk VirtualMachine.Config.AddNewDisk
VirtualMachine.Config.RemoveDisk VirtualMachine.Config.CPUCount
VirtualMachine.Config.Memory VirtualMachine.Config.RawDevice
VirtualMachine.Config.AddRemoveDevice VirtualMachine.Config.Settings
VirtualMachine.Config.AdvancedConfig VirtualMachine.Config.SwapPlacement
VirtualMachine.Config.HostUSBDevice VirtualMachine.Config.DiskExtend
VirtualMachine.Config.ChangeTracking
VirtualMachine.Provisioning.ReadCustSpecs
VirtualMachine.Inventory.CreateFromExisting
VirtualMachine.Inventory.CreateNew VirtualMachine.Inventory.Move
VirtualMachine.Inventory.Register VirtualMachine.Inventory.Remove
VirtualMachine.Inventory.Unregister DVSwitch.CanUse DVPortgroup.CanUse
Datastore.AllocateSpace Datastore.BrowseDatastore
Datastore.LowLevelFileOperations Datastore.RemoveFile Network.Assign
Resource.AssignVirtualMachineToResourcePool
Creates a clone of a particular VM
Reconfigures a particular virtual machine.
VirtualMachine.Interact.PowerOff
VirtualMachine.Inventory.Delete
SusVirtualMachine.Interact.Suspend
pendVM_Task
RebootGuest
VirtualMachine.Interact.Reset
Powers on a virtual machine
Powers off a virtual machine
Deletes a VM
(including disks)
Suspends a VM
Renapshot_Task
RemoveSnapshot_Task
Revert-
ToSnapshot_Task
VirtualMachine.Interact.Reset
setVM_Task
ShutdownGuest
VirtualMachine.Interact.PowerOff
CreateS-
VirtualMachine.State.CreateSnapshot
VirtualMachine.State.RemoveSnapshot
VirtualMachine.State.RevertToSnapshot
Reboots VM’s guest Operating
System
Resets power on a virtual machine
Shutdown guest
Operating System
Creates a new snapshot of a virtual machine.
Removes a snapshot form a virtual machine
Create-
VirtualDisk_Task
CopytualDisk_Task
Delete-
VirtualDisk_Task
Datastore.FileManagement
Datastore.FileManagement
Datastore.FileManagement
Revert a virtual machine to a particular snapshot
On all VMFS datastores represented by
OpenNebula
On all VMFS datastores represented by
OpenNebula
On all VMFS datastores represented by
OpenNebula
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Note: For security reasons, you may define different users to access different ESX Clusters. A different user can be defined in OpenNebula per ESX cluster, which is encapsulated in OpenNebula as an OpenNebula host.
• All ESX hosts belonging to the same ESX cluster to be exposed to OpenNebula must share at least one datastore among them.
• The ESX cluster should have DRS enabled. DRS is not required but it is recommended. OpenNebula does not schedule to the granularity of ESX hosts, DRS is needed to select the actual ESX host within the cluster, otherwise the VM will be launched in the ESX where the VM template has been created.
• Save as VM Templates those VMs that will be instantiated through the OpenNebula provisioning portal
• To enable VNC functionality, repeat the following procedure for each ESX:
– In the vSphere client proceed to Home -> Inventory -> Hosts and Clusters
– Select the ESX host, Configuration tab and select Security Profile in the Software category
– In the Firewall section, select Edit. Enable GDB Server, then click OK
– Make sure that the ESX hosts are reachable from the OpenNebula Front-end
Important: OpenNebula will NOT modify any vCenter configuration.
3.3.2 Configuration
There are a few simple steps needed to configure OpenNebula so it can interact with vCenter:
Step 1: Check connectivity
The OpenNebula Front-end needs network connectivity to all the vCenters that it is supposed to manage.
Additionally, to enable VNC access to the spawned Virtual Machines, the Front-end also needs network connectivity to all the ESX hosts
Step 2: Enable the drivers in the Front-end (oned.conf)
In order to configure OpenNebula to work with the vCenter drivers, the following sections need to be uncommented or added in the /etc/one/oned.conf file:
#-------------------------------------------------------------------------------
# vCenter Information Driver Manager Configuration
#
#
-r number of retries when monitoring a host
-t number of threads, i.e. number of hosts monitored at the same time
#-------------------------------------------------------------------------------
IM_MAD = [
NAME = "vcenter" ,
SUNSTONE_NAME = "VMWare vCenter" ,
EXECUTABLE = "one_im_sh" ,
ARGUMENTS = "-c -t 15 -r 0 vcenter" ]
#-------------------------------------------------------------------------------
#-------------------------------------------------------------------------------
# vCenter Virtualization Driver Manager Configuration
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#
#
#
#
-r number of retries when monitoring a host
-t number of threads, i.e. number of hosts monitored at the same time
-p more than one action per host in parallel, needs support from hypervisor
-s <shell> to execute commands, bash by default
#
#
-d default snapshot strategy. It can be either 'detach' or 'suspend'. It defaults to 'suspend'.
#-------------------------------------------------------------------------------
VM_MAD = [
NAME = "vcenter" ,
SUNSTONE_NAME = "VMWare vCenter" ,
EXECUTABLE
ARGUMENTS default
=
=
=
"one_vmm_sh" ,
"-p -t 15 -r 0 vcenter -s sh" ,
"vmm_exec/vmm_exec_vcenter.conf" ,
TYPE = "xml" ,
IMPORTED_VMS_ACTIONS = "terminate, terminate-hard, hold, release, suspend, resume, delete, reboot, reboot hard, resched, unresched, poweroff, poweroff hard, disk attach, disk detach, nic attach, nic detach, snap create, snap delete "
]
#-------------------------------------------------------------------------------
As a Virtualization driver, the vCenter driver accept a series of parameters that control their execution. The parameters allowed are: parameter description
-r <num> number of retries when executing an action
-t <num number of threads, i.e. number of actions done at the same time
See the Virtual Machine drivers reference for more information about these parameters, and how to customize and extend the drivers.
OpenNebula needs to be restarted afterwards, this can be done with the following command:
$ sudo service opennebula restart
Step 3: Importing vCenter Clusters
OpenNebula ships with a powerful CLI tool to import vCenter clusters, VM Templates, Networks and running VMs.
The tools is self-explanatory, just set the credentials and FQDN/IP to access the vCenter host and follow on screen instructions. A sample section follows:
$ onehost list
ID NAME CLUSTER RVM ALLOCATED_CPU ALLOCATED_MEM STAT
$ onevcenter hosts --vcenter <vcenter-host> --vuser <vcenter-username> --vpass
˓→
<vcenter-password>
Connecting to vCenter: <vcenter-host>...done!
Exploring vCenter resources...done!
Do you want to process datacenter Development [ y/n ] ? y
* Import cluster clusterA
[ y/n ] ? y
OpenNebula host clusterA with id 0 successfully created.
* Import cluster clusterB
[ y/n ] ? y
OpenNebula host clusterB with id 1 successfully created.
$ onehost list
ID NAME CLUSTER RVM ALLOCATED_CPU ALLOCATED_MEM STAT
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0 clusterA
1 clusterB
$ onehost list
ID NAME
0 clusterA
1 clusterB
$ onehost list
ID NAME
0 clusterA
1 clusterB
-
-
CLUSTER
-
-
CLUSTER
-
-
RVM
0
0
0
0
RVM
0
0
ALLOCATED_CPU
0 / 800 ( 0% )
-
-
-
ALLOCATED_CPU
0 / 800 ( 0% )
0 / 1600 ( 0% )
- init
- init
ALLOCATED_MEM STAT
0K / 16G ( 0% ) on
- init
ALLOCATED_MEM STAT
0K / 16G ( 0% ) on
0K / 16G ( 0% ) on
The following variables are added to the OpenNebula hosts representing ESX clusters:
Operation
VCENTER_HOST
VCENTER_USER
Note hostname or IP of the vCenter host
Name of the vCenter user
VCENTER_PASSWORD Password of the vCenter user
Once the vCenter cluster is monitored, OpenNebula will display any existing VM as Wild. These VMs can be
and managed through OpenNebula.
Note: OpenNebula will create a special key at boot time and save it in /var/lib/one/.one/one_key. This key will be used as a private key to encrypt and decrypt all the passwords for all the vCenters that OpenNebula can access. Thus, the password shown in the OpenNebula host representing the vCenter is the original password encrypted with this special key.
Note:
OpenNebula will add by default a one-<vid>- prefix to the name of the vCenter VMs it spawns, where
<vid> is the id of the VM in OpenNebula. This value can be changed using a special attribute set in the vCenter cluster representation in OpenNebula, ie, the OpenNebula host. This attribute is called VM_PREFIX (which can be set in the OpenNebula host template), and will evaluate one variable, $i, to the id of the VM. A value of one-$iin that parameter would have the same behavior as the default.
After this guide, you may want to
or learn how to setup the
vmware-based cloud infrastructure .
Step 4: Next Steps
Jump to the
section in order to get to launch a test VM.
3.4 Verify your Installation
This chapter ends with this optional section, where you will be able to test your cloud by launching a virtual machine and test that everything is working correctly.
You should only follow the specific subsection for your hypervisor.
3.4.1 KVM based Cloud Verification
The goal of this subsection is to launch a small Virtual Machine, in this case a TTYLinux (which is a very small Virtual
Machine just for testing purposes).
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Requirements
To complete this section, you must have network connectivity to the Internet from the Front-end, in order to import an appliance from http://marketplace.opennebula.systems
.
Step 1. Check that the Hosts are on
The Hosts that you have registered should be in ON status.
Step 2. Import an appliance from the MarketPlace.
We need to add an Image to our Cloud. To do so we can do so by navigating to Storage -> Apps in the left side menu
(1). You will see a list of Appliances, you can filter by tty kvm (2) in order to find the one we are going to use in this guide. After that select it (3) and click to button with an arrow pointing to OpenNebula (4) in order to import it.
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A dialog with the information of the appliance you have selected will pop up. You will need to select the datastore under the “Select the Datastore to store the resource” (1) and then click on the “Download” button (2)
Navigate now to the Storage -> Images tab and refresh until the Status of the Image switches to READY.
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Step 3. Instantiate a VM
Navigate to Templates -> VMs, then select the ttylinux - kvm template that has been created and click on the
“Instantiate”.
In this dialog simply click on the “Instantiate” button.
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Step 4. Test VNC access
Navigate to Instances -> VMs. You will see that after a while the VM switches to Status RUNNING (you might need to click on the refresh button). Once it does, you can click on the VNC icon (at the right side of the image below).
If the VM fails, click on the VM and then in the Log tab to see why it failed. Alternatively, you can look at the log file /var/log/one/<vmid>.log.
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Step 5. Adding Network connectivity to your VM
As you might have noticed, this VM does not have networking yet, this is because it depends a lot in your network technology. You would need to follow these steps in order to add Networking to the template.
1. Read the
chapter to choose a network technology, unless you have chosen to use the dummy driver explained in the
section and you have configured the bridges properly.
2. Create a new Network in the Network -> Virtual Networks dialog, and fill in the details of your network: like the Bridge, or the Physical Device, the IP ranges, etc.
3. Select the ttylinux - kvm template and update it. In the Network section of the template, select the network that you created in the previous step.
4. Instantiate and connect to the VM.
3.4.2 vCenter based Cloud Verification
In order to verify the correct installation of your OpenNebua cloud, follow the next steps. The following assumes that
Sunstone is up and running, as explained in the
front-end installation Section . To access Sunstone, point your browser
to http://<fontend_address>:9869.
Step 1. Import a VM Template
You will need a VM Template defined in vCenter, and then import it using the steps described in the
Step 2. Instantiate the VM Template
You can easily instantiate the template to create a new VM from it using Sunstone. Proceed to the Templates tab of the left side menu, VMs Section, select the imported template and click on the Instantiate button.
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Step 3. Check the VM is Running
The scheduler should place the VM in the vCenter cluster imported as part of the
Section.
After a few minutes (depending on the size of the disks defined by the VM Template), the sate of the VM should be
RUNNING
. You can check the process in Sunstone in the Instances tab of the left side menu, VMs Section.
Once the VM is running, click on the VNC blue icon, and if you can see a console to the VM, congratulations! You have a fully functional OpenNebula cloud.
The next step would be to further configure the OpenNebula cloud to suits your needs. You can learn more in the
guide.
3.4.3 Next steps
After this chapter, you are ready to start using your cloud or you could configure more components:
•
tication technologies.
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•
about specific enhanced configurations for Sunstone.
If your cloud is KVM based you should also follow:
•
•
•
Otherwise, if it’s VMware based:
• Head over to the
chapter.
3.4. Verify your Installation 44
CHAPTER
FOUR
AUTHENTICATION SETUP
4.1 Overview
OpenNebula comes by default with an internal user/password authentication system, see the Users & Groups Subsystem guide for more information. You can enable an external Authentication driver.
4.1.1 Authentication
In the figure to the right of this text you can see three authentication configurations you can customize in OpenNebula.
a) CLI/API Authentication
You can choose from the following authentication drivers to access OpenNebula from the command line:
• Built-in User/Password and token authentication
•
•
•
b) Sunstone Authentication
By default any authentication driver configured to work with OpenNebula can be used out-of-the-box with Sunstone.
Additionally you can add SSL security to Sunstone as described in the
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c) Servers Authentication
This method is designed to delegate the authentication process to high level tools interacting with OpenNebula. You’ll be interested in this method if you are developing your own servers.
By default, OpenNebula ships with two servers:
and EC2. When a user interacts with one of them, the server authenticates the request and then forwards the requested operation to the OpenNebula daemon.
The forwarded requests are encrypted by default using a Symmetric Key mechanism. The following guide shows how to strengthen the security of these requests using x509 certificates. This is specially relevant if you are running your server in a machine other than the front-end.
•
4.1.2 How Should I Read This Chapter
When designing the architecture of your cloud you will have to choose where to store user’s credentials. Different authentication methods can be configured at the same time and selected per user basis. One big distinction between the different authentication methods is the ability to be used by API, CLI and/or only Sunstone (web interface).
Can be used with API, CLI and Sunstone:
• Built-in User/Password
• LDAP
Can be used only with API and CLI:
• SSH
Can be used only with Sunstone:
• X509
The following sections are self-contained so you can directly go to the guide that describes the configuration for the chosen auth method.
4.1.3 Hypervisor Compatibility
Section Compatibility
Built-in User/Password and token authentication This Section applies to both KVM and vCenter.
This Section applies to both KVM and vCenter.
This Section applies to both KVM and vCenter.
This Section applies to both KVM and vCenter.
This Section applies to both KVM and vCenter.
4.2 SSH Authentication
This guide will show you how to enable and use the SSH authentication for the OpenNebula CLI. Using this authentication method, users login to OpenNebula with a token encrypted with their private ssh keys.
4.2.1 Requirements
You don’t need to install any additional software.
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4.2.2 Considerations & Limitations
With the current release, this authentication method is only valid to interact with OpenNebula using the CLI.
4.2.3 Configuration
OpenNebula Configuration
The Auth MAD and ssh authentication is enabled by default. In case it does not work make sure that the authentication method is in the list of enabled methods.
AUTH_MAD = [ executable = "one_auth_mad" , authn = "ssh,x509,ldap,server_cipher,server_x509"
]
There is an external plain user/password authentication driver, and existing accounts will keep working as usual.
4.2.4 Usage
Create New Users
This authentication method uses standard ssh RSA key pairs for authentication. Users can create these files if they don’t exist using this command:
$ ssh-keygen -t rsa
OpenNebula commands look for the files generated at the standard location ($HOME/.ssh/id_rsa) so it is a good idea not to change the default path. It is also a good idea to protect the private key with a password.
The users requesting a new account have to generate a public key and send it to the administrator. The way to extract it is the following:
$ oneuser key
Enter PEM pass phrase:
MIIBCAKCAQEApUO+JISjSf02rFVtDr1yar/34EoUoVETx0n+RqWNav+5wi+gHiPp3e03AfEkXzjDYi8F voS4a4456f1OUQlQddfyPECn59OeX8Zu4DH3gp1VUuDeeE8WJWyAzdK5hg6F+RdyP1pT26mnyunZB8Xd bll8seoIAQiOS6tlVfA8FrtwLGmdEETfttS9ukyGxw5vdTplse/fcam+r9AXBR06zjc77x+DbRFbXcgI
1XIdpVrjCFL0fdN53L0aU7kTE9VNEXRxK8sPv1Nfx+FQWpX/HtH8ICs5WREsZGmXPAO/IkrSpMVg5taS jie9JAQOMesjFIwgTWBUh6cNXuYsQ/5wIwIBIw ==
The string written to the console must be sent to the administrator, so the can create the new user in a similar way as the default user/password authentication users.
The following command will create a new user with username ‘newuser’, assuming that the previous public key is saved in the text file /tmp/pub_key:
$ oneuser create newuser --ssh --read-file /tmp/pub_key
Instead of using the --read-file option, the public key could be specified as the second parameter.
If the administrator has access to the user’s private ssh key, he can create new users with the following command:
$ oneuser create newuser --ssh --key /home/newuser/.ssh/id_rsa
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Update Existing Users to SSH
You can change the authentication method of an existing user to SSH with the following commands:
$ oneuser chauth <id|name> ssh
$ oneuser passwd <id|name> --ssh --read-file /tmp/pub_key
As with the create command, you can specify the public key as the second parameter, or use the user’s private key with the --key option.
User Login
Users must execute the ‘oneuser login’ command to generate a login token.
The token will be stored in the
$ONE_AUTH environment variable. The command requires the OpenNebula username, and the authentication method (--ssh in this case).
$ oneuser login newuser --ssh
The default ssh key is assumed to be in ~/.ssh/id_rsa, otherwise the path can be specified with the --key option.
The generated token has a default expiration time of 10 hour. You can change that with the --time option.
4.3 x509 Authentication
This guide will show you how to enable and use the x509 certificates authentication with OpenNebula. The x509 certificates can be used in two different ways in OpenNebula.
The first option that is explained in this guide enables us to use certificates with the CLI. In this case the user will generate a login token with his private key, OpenNebula will validate the certificate and decrypt the token to authenticate the user.
The second option enables us to use certificates with Sunstone and the Public Cloud servers included in OpenNebula.
In this case the authentication is leveraged to Apache or any other SSL capable HTTP proxy that has to be configured by the administrator. If this certificate is validated the server will encrypt those credentials using a server certificate and will send the token to OpenNebula.
4.3.1 Requirements
If you want to use the x509 certificates with Sunstone or one of the Public Clouds, you must deploy a SSL capable
HTTP proxy on top of them in order to handle the certificate validation.
4.3.2 Considerations & Limitations
The X509 driver uses the certificate DN as user passwords. The x509 driver will remove any space in the certificate
DN. This may cause problems in the unlikely situation that you are using a CA signing certificate subjects that only differ in spaces.
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4.3.3 Configuration
The following table summarizes the available options for the x509 driver (/etc/one/auth/x509_auth.conf):
VARI-
ABLE
VALUE
:ca_dir Path to the trusted CA directory. It should contain the trusted CA’s for the server, each CA certificate should be name CA_hash.0
them. You can enforce CRL checking by defining :check_crl, i.e. authentication will fail if no CRL file is found. You can always disable this feature by moving or renaming .r0 files
Follow these steps to change oneadmin’s authentication method to x509:
Warning: You should have another account in the oneadmin group, so you can revert these steps if the process fails.
•
to the oneadmin certificate DN.
$ oneuser chauth 0 x509 --x509 --cert /tmp/newcert.pem
•
to the certificates directory
$ openssl x509 -noout -hash -in cacert.pem
78d0bbd8
$ sudo cp cacert.pem /etc/one/auth/certificates/78d0bbd8.0
•
for oneadmin using the –x509 option. This token has a default expiration time set to 1 hour, you can change this value using the option –time.
$ oneuser login oneadmin --x509 --cert newcert.pem --key newkey.pem
Enter PEM pass phrase: export ONE_AUTH = /home/oneadmin/.one/one_x509
• Set ONE_AUTH to the x509 login file
$ export ONE_AUTH = /home/oneadmin/.one/one_x509
4.3.4 Usage
Add and Remove Trusted CA Certificates
You need to copy all trusted CA certificates to the certificates directory, renaming each of them as <CA_hash>.0.
The hash can be obtained with the openssl command:
$ openssl x509 -noout -hash -in cacert.pem
78d0bbd8
$ sudo cp cacert.pem /etc/one/auth/certificates/78d0bbd8.0
To stop trusting a CA, simply remove its certificate from the certificates directory.
This process can be done without restarting OpenNebula, the driver will look for the certificates each time an authentication request is made.
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Create New Users
The users requesting a new account have to send their certificate, signed by a trusted CA, to the administrator. The following command will create a new user with username ‘newuser’, assuming that the user’s certificate is saved in the file /tmp/newcert.pem:
$ oneuser create newuser --x509 --cert /tmp/newcert.pem
This command will create a new user whose password contains the subject DN of his certificate. Therefore if the subject DN is known by the administrator the user can be created as follows:
$ oneuser create newuser --x509 "user_subject_DN"
Update Existing Users to x509 & Multiple DN
You can change the authentication method of an existing user to x509 with the following command:
• Using the user certificate:
$ oneuser chauth <id|name> x509 --x509 --cert /tmp/newcert.pem
• Using the user certificate subject DN:
$ oneuser chauth <id|name> x509 --x509 "user_subject_DN"
You can also map multiple certificates to the same OpenNebula account. Just add each certificate DN separated with
‘|’ to the password field.
$ oneuser passwd <id|name> --x509 "/DC=es/O=one/CN=user|/DC=us/O=two/CN=user"
User Login
Users must execute the ‘oneuser login’ command to generate a login token.
The token will be stored in the
$ONE_AUTH environment variable. The command requires the OpenNebula username, and the authentication method (--x509 in this case).
newuser@frontend $ oneuser login newuser --x509 --cert newcert.pem --key newkey.pem
Enter PEM pass phrase:
The generated token has a default expiration time of 10 hours. You can change that with the --time option.
4.3.5 Tuning & Extending
The x509 authentication method is just one of the drivers enabled in AUTH_MAD. All drivers are located in /var/ lib/one/remotes/auth
.
OpenNebula is configured to use x509 authentication by default. You can customize the enabled drivers in the
AUTH_MAD attribute of
. More than one authentication method can be defined:
AUTH_MAD = [ executable = "one_auth_mad" , authn = "ssh,x509,ldap,server_cipher,server_x509"
]
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4.3.6 Enabling x509 auth in Sunstone
Update the /etc/one/sunstone-server.conf :auth parameter to use the x509 auth:
:auth: x509
4.4 LDAP Authentication
The LDAP Authentication add-on permits users to have the same credentials as in LDAP, so effectively centralizing authentication. Enabling it will let any correctly authenticated LDAP user to use OpenNebula.
4.4.1 Prerequisites
Warning: This Add-on requires the ‘net/ldap’ ruby library provided by the ‘net-ldap’ gem.
This Add-on will not install any Ldap server or configure it in any way. It will not create, delete or modify any entry in the Ldap server it connects to. The only requirement is the ability to connect to an already running Ldap server and being able to perform a successful ldapbind operation and have a user able to perform searches of users, therefore no special attributes or values are required in the LDIF entry of the user authenticating.
4.4.2 Configuration
Configuration file for auth module is located at /etc/one/auth/ldap_auth.conf. This is the default configuration: server 1:
# Ldap user able to query, if not set connects as anonymous. For
# Active Directory append the domain name. Example:
#:user: 'admin'
#:password: 'password'
# Ldap authentication method
:auth_method: :simple
# Ldap server
:host: localhost
:port: 389
# Uncomment this line for tls connections
#:encryption: :simple_tls
# base hierarchy where to search for users and groups
:base: 'dc=domain'
# group the users need to belong to. If not set any user will do
#:group: 'cn=cloud,ou=groups,dc=domain'
# field that holds the user name, if not set 'cn' will be used
:user_field: 'cn'
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# for Active Directory use this user_field instead
#:user_field: 'sAMAccountName'
# field name for group membership, by default it is 'member'
#:group_field: 'member'
# user field that that is in in the group group_field, if not set 'dn' will be
˓→ used
#:user_group_field: 'dn'
# Generate mapping file from group template info
:mapping_generate: true
# Seconds a mapping file remain untouched until the next regeneration
:mapping_timeout: 300
# Name of the mapping file in OpenNebula var directory
:mapping_filename: server1.yaml
# Key from the OpenNebula template to map to an AD group
:mapping_key: GROUP_DN
# Default group ID used for users in an AD group not mapped
:mapping_default: 1
# this example server wont be called as it is not in the :order list server 2:
:auth_method: :simple
:host: localhost
:port: 389
:base: 'dc=domain'
#:group: 'cn=cloud,ou=groups,dc=domain'
:user_field: 'cn'
# List the order the servers are queried
:order:
- server 1
#- server 2
The structure is a hash where any key different to :order will contain the configuration of one ldap server we want to query. The special key :order holds an array with the order we want to query the configured servers. Any server not listed in :order wont be queried.
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VARIABLE
:user
DESCRIPTION
Name of the user that can query ldap. Do not set it if you can perform queries anonymously
Password for the user defined in :user. Do not set if anonymous access is enabled
:password
:auth_method Can be set to :simple_tls if SSL connection is needed
:encryption
Can be set to :simple_tls if SSL connection is needed
:host
:port
Host name of the ldap server
Port of the ldap server
:base
:group
Base leaf where to perform user searches
If set the users need to belong to this group
:user_field
Field in ldap that holds the user name
:mapping_key
Key in the group template used to generate the mapping file. It should hold the DN of the mapped group user to be authorized if it does not belong to a mapped group
To enable ldap authentication the described parameters should be configured. OpenNebula must be also configured to enable external authentication. Add this line in /etc/one/oned.conf
DEFAULT_AUTH = "ldap"
4.4.3 User Management
Using LDAP authentication module the administrator doesn’t need to create users with oneuser command as this will be automatically done.
Users can store their credentials into $ONE_AUTH file (usually $HOME/.one/one_auth) in this fashion:
<user_dn>:ldap_password where
• <user_dn> the DN of the user in the LDAP service
• ldap_password is the password of the user in the LDAP service
Alternatively a user can generate an authentication token using the oneuser login command, so there is no need to keep the ldap password in a plain file. Simply input the ldap_password when requested. More information on the management of login tokens and $ONE_AUTH file can be found in Managing Users Guide.
DN’s With Special Characters
When the user dn or password contains blank spaces the LDAP driver will escape them so they can be used to create
OpenNebula users. Therefore, users needs to set up their $ONE_AUTH file accordingly.
Users can easily create escaped $ONE_AUTH tokens with the command oneuser encode <user>
[<password>] , as an example:
$ oneuser encode 'cn=First Name,dc=institution,dc=country' 'pass word' cn = First%20Name,dc = institution,dc = country:pass%20word
The output of this command should be put in the $ONE_AUTH file.
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4.4.4 Active Directory
LDAP Auth drivers are able to connect to Active Directory. You will need:
• Active Directory server with support for simple user/password authentication.
• User with read permissions in the Active Directory user’s tree.
You will need to change the following values in the configuration file (/etc/one/auth/ldap_auth.conf):
• :user: the Active Directory user with read permissions in the user’s tree plus the domain. For example for user
Administrator at domain win.opennebula.org you specify it as [email protected].
org
• :password: password of this user
• :host: hostname or IP of the Domain Controller
• :base: base DN to search for users.
You need to decompose the full domain name and use each part as DN component.
Example, for win.opennebula.org you will get the base DN:
DN=win,DN=opennebula,DN=org
• :user_field: set it to sAMAccountName
:group parameter is still not supported for Active Directory, leave it commented.
4.4.5 Group Mapping
You can make new users belong to an specific group or groups. To do this a mapping is generated from the LDAP group to an existing OpenNebula group. This system uses a mapping file specified by :mapping_file parameter and resides in OpenNebula var directory. The mapping file can be generated automatically using data in the group template that tells which LDAP group maps to that specific group. For example we can add in the group template this line:
GROUP_DN = "CN=technicians,CN=Groups,DC=example,DC=com"
And in the ldap configuration file we set the :mapping_key to GROUP_DN. This tells the driver to look for the group
DN in that template parameter. This mapping expires the number of seconds specified by :mapping_timeout.
This is done so the authentication is not continually querying OpenNebula.
You can also disable the automatic generation of this file and do the mapping manually. The mapping file is in YAML format and contains a hash where the key is the LDAP’s group DN and the value is the ID of the OpenNebula group.
For example:
CN=technicians,CN=Groups,DC=example,DC=com: '100'
CN=Domain Admins,CN=Users,DC=example,DC=com: '101'
When several servers are configured you should have different :mapping_key and :mapping_file values for each one so they don’t collide. For example: internal:
:mapping_file: internal.yaml
:mapping_key: INTERNAL_GROUP_DN external:
:mapping_file: external.yaml
:mapping_key: EXTERNAL_GROUP_DN
And in the OpenNebula group template you can define two mappings, one for each server:
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INTERNAL_GROUP_DN = "CN=technicians,CN=Groups,DC=internal,DC=com"
EXTERNAL_GROUP_DN = "CN=staff,DC=other-company,DC=com"
Note: If the map is updated (e.g. you change the LDAP DB) the user groups will be updated next time the user is authenticated. Also note that a user maybe using a login token that needs to expire to this changes to take effect.
The max. life time of a token can be set in oned.conf per each driver. If you want the OpenNebula core not to update user groups (and control group assigment from OpenNebula) update DRIVER_MANAGED_GROUPS in the ldap AUTH_MAD_CONF configuration attribute.
4.4.6 Enabling LDAP auth in Sunstone
Update the /etc/one/sunstone-server.conf :auth parameter to use the opennebula:
:auth: opennebula
Using this method the credentials provided in the login screen will be sent to the OpenNebula core and the authentication will be delegated to the OpenNebula auth system, using the specified driver for that user. Therefore any
OpenNebula auth driver can be used through this method to authenticate the user (i.e: LDAP).
To automatically encode credentials as explained in
section also add this parameter to sunstone configuration:
:encode_user_password: true
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CHAPTER
FIVE
SUNSTONE SETUP
5.1 Overview
OpenNebula Sunstone is a Graphical User Interface (GUI) intended for both end users and administrators that simplifies the typical management operations in private and hybrid cloud infrastructures. OpenNebula Sunstone allows to easily manage all OpenNebula resources and perform typical operations on them.
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5.1.1 How Should I Read this Chapter
The
Sunstone Installation & Configuration
section describes the configuration and customization options for Sunstone
After Sunstone is running, you can define different sunstone behaviors for each user role in the
section.
For more information on how to customize and extend you Sunstone deployment use the following links:
•
Security & Authentication Methods , improve security with x509 authentication and SSL
•
•
Advanced Deployments , improving scalability and isolating the server
5.1.2 Hypervisor Compatibility
Sunstone is available for all the hypervisors.
When using vCenter, the cloud admin should enable the admin_vcenter
, groupadmin_vcenter and cloud_vcenter
5.2 Sunstone Installation & Configuration
5.2.1 Requirements
You must have an OpenNebula site properly configured and running to use OpenNebula Sunstone, be sure to check the OpenNebula Installation and Configuration Guides to set up your private cloud first. This section also assumes that you are familiar with the configuration and use of OpenNebula.
OpenNebula Sunstone was installed during the OpenNebula installation. If you followed the
then you already have all ruby gem requirements. Otherwise, run the install_gem script as root:
# /usr/share/one/install_gems sunstone
The Sunstone Operation Center offers the possibility of starting a VNC/SPICE session to a Virtual Machine. This is done by using a VNC/SPICE websocket-based client (noVNC) on the client side and a VNC proxy translating and redirecting the connections on the server-side.
Warning: The SPICE Web client is a prototype and is limited in function. More information of this component can be found in the following link
Warning: Make sure that there is free space in sunstone’s log directory or it will die silently. By default the log directory is /var/log/one.
Requirements:
• Websockets-enabled browser (optional): Firefox and Chrome support websockets. In some versions of Firefox manual activation is required. If websockets are not enabled, flash emulation will be used.
• Installing the python-numpy package is recommended for a better vnc performance.
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5.2.2 Considerations & Limitations
OpenNebula Sunstone supports Chrome, Firefox and Internet Explorer 11. Other browsers are not supported and may not work well.
Note: Internet Explorer is not supported with the Compatibility Mode enabled, since it emulates IE7 which is not supported.
5.2.3 Configuration sunstone-server.conf
The Sunstone configuration file can be found at /etc/one/sunstone-server.conf. It uses YAML syntax to define some options:
Available options are:
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Option
:tmpdir
Description
Uploaded images will be temporally stored in this folder before being copied to OpenNebula
:one_xmlrpc OpenNebula daemon host and port
:host
:port
:sessions
IP address on which the server will listen on. 0.0.0.0 by default.
Port on which the server will listen. 9869 by default.
:memcache_host
Method of keeping user sessions. It can be memory or memcache. For server that spawn more than one process (like Passenger or Unicorn) memcache should be used
Host where memcached server resides
:memcache_port
:mem-
Port of memcached server memcache namespace where to store sessions. Useful when memcached server is used by more
:debug_level
:env
Log debug level: 0 = ERROR, 1 = WARNING, 2 = INFO, 3 = DEBUG
Execution environment for Sunstone. dev, Instead of pulling the minified js all the files will be pulled (app/main.js). Check the Building from Source guide in the docs, for details on how to run
Sunstone in development. prod, the minified js will be used (dist/main.js)
:auth Authentication driver for incoming requests. Possible values are sunstone, opennebula, remote and x509. Check
for more info
:core_auth Authentication driver to communicate with OpenNebula core. Possible values are x509 or cipher
. Check
for more information
:enFor external authentication drivers, such as LDAP. Performs a URL encoding on the credentials sent
:lang Default language for the Sunstone interface. This is the default language that will be used if user has not defined a variable LANG with a different valid value its user template
29876 by default.
websockets. If set to only the proxy will only accept encrypted connections, otherwise it will accept both encrypted or unencrypted ones.
:table_order
Default table order, resources get ordered by ID in asc or desc order.
:marketUsername credential to connect to the Marketplace.
place_username
:marketPassword to connect to the Marketplace.
place_password
:marketplace_url
Endpoint to connect to the Marketplace. If commented, a 503 service unavailable error will be returned to clients.
Endpoint to connect to the OneFlow server.
:oneflow_server
:routes List of files containing custom routes to be loaded. Check server plugins for more info.
Starting Sunstone
To start Sunstone just issue the following command as oneadmin
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# service opennebula-sunstone start
You can find the Sunstone server log file in /var/log/one/sunstone.log. Errors are logged in /var/log/ one/sunstone.error
.
5.2.4 Commercial Support Integration
We are aware that in production environments, access to professional, efficient support is a must, and this is why we have introduced an integrated tab in Sunstone to access OpenNebula Systems (the company behind OpenNebula, formerly C12G) professional support. In this way, support ticket management can be performed through Sunstone, avoiding disruption of work and enhancing productivity.
This tab and can be disabled in each one of the
enabled_tabs:
[ ...
]
#- support-tab
5.2.5 Troubleshooting
Cannot connect to OneFlow server
The Service instances and templates tabs may show the following message:
Cannot connect to OneFlow server
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You need to start the OneFlow component following this section, or disable the Service and Service Templates menu entries in the
VNC Troubleshooting
When clicking the VNC icon, the process of starting a session begins:
• A request is made and if a VNC session is possible, Sunstone server will add the VM Host to the list of allowed vnc session targets and create a random token associated to it.
• The server responds with the session token, then a noVNC dialog pops up.
• The VNC console embedded in this dialog will try to connect to the proxy either using websockets (default) or emulating them using Flash. Only connections providing the right token will be successful. The token expires and cannot be reused.
There can be multiple reasons that may prevent noVNC from correctly connecting to the machines. Here’s a checklist of common problems:
• noVNC requires Python >= 2.5 for the websockets proxy to work. You may also need additional modules as python2<version>-numpy
.
• You can retrieve useful information from /var/log/one/novnc.log
• You must have a GRAPHICS section in the VM template enabling VNC, as stated in the documentation. Make sure the attribute IP is set correctly (0.0.0.0 to allow connections from everywhere), otherwise, no connections will be allowed from the outside.
• Your browser must support websockets, and have them enabled. This is the default in current Chrome and
Firefox, but former versions of Firefox (i.e. 3.5) required manual activation. Otherwise Flash emulation will be used.
• Make sure there are not firewalls blocking the connections. The proxy will redirect the websocket data from the VNC proxy port to the VNC port stated in the template of the VM. The value of the proxy port is defined in sunstone-server.conf
.
• Make sure that you can connect directly from Sunstone frontend to the VM using a normal VNC client tools such as vncviewer.
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• When using secure websockets, make sure that your certificate and key (if not included in certificate) are correctly set in Sunstone configuration files. Note that your certificate must be valid and trusted for the wss connection to work. If you are working with a certicificate that it is not accepted by the browser, you can manually add it to the browser trust-list visiting https://sunstone.server.address:vnc_proxy_port. The browser will warn that the certificate is not secure and prompt you to manually trust it.
• If your connection is very, very, very slow, there might be a token expiration issue. Please try the manual proxy launch as described below to check it.
• Doesn’t work yet? Try launching Sunstone, killing the websockify proxy and relaunching the proxy manually in a console window with the command that is logged at the beginning of /var/log/one/novnc.log.
You must generate a lock file containing the PID of the python process in /var/lock/one/.novnc.lock
Leave it running and click on the VNC icon on Sunstone for the same VM again. You should see some output from the proxy in the console and hopefully the cause of why the connection does not work.
• Please contact the support forum only when you have gone through the suggestion above and provide full sunstone logs, shown errors and any relevant information of your infrastructure (if there are Firewalls etc)
• The message “SecurityError: The operation is insecure.” is usually related to a Same-Origin-Policy problem. If you have Sunstone TLS secured and try to connect to an insecure websocket for VNC, Firefox blocks that. For
Firefox, you need to have both connections secured to not get this error. And don’t use a self-signed certificate for the server, this would raise the error again (you can setup your own little CA, that works, but don’t use a self-signed server certificate). The other option would be to go into the Firefox config (about:config) and set
“network.websocket.allowInsecureFromHTTPS” to “true”.
5.2.6 Tuning & Extending
Internationalization and Languages
Sunstone supports multiple languages. If you want to contribute a new language, make corrections or complete a translation, you can visit our:
• Transifex poject page
Translating through Transifex is easy and quick. All translations should be submitted via Transifex.
Users can update or contribute translations anytime. Prior to every release, normally after the beta release, a call for translations will be made in the forum. Then the source strings will be updated in Transifex so all the translations can be updated to the latest OpenNebula version. Translation with an acceptable level of completeness will be added to the final OpenNebula release.
Customize the VM Logos
The VM Templates have an image logo to identify the guest OS. To modify the list of available logos, or to add new ones, edit /etc/one/sunstone-logos.yaml.
- { 'name' : "Arch Linux" ,
- { 'name' : "CentOS" ,
- { 'name' : "Debian" ,
- { 'name' : "Fedora" ,
- { 'name' : "Linux" ,
- { 'name' : "Redhat" ,
- { 'name' : "Ubuntu" ,
- { 'name' : "Windows XP/2003" ,
- { 'name' : "Windows 8" ,
'path' : "images/logos/arch.png" }
'path' : "images/logos/centos.png" }
'path' : "images/logos/debian.png" }
'path' : "images/logos/fedora.png" }
'path' : "images/logos/linux.png" }
'path' : "images/logos/redhat.png" }
'path' : "images/logos/ubuntu.png" }
'path' : "images/logos/windowsxp.png" }
'path' : "images/logos/windows8.png" }
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Branding the Sunstone Portal
You can easily add you logos to the login and main screens by updating the logo: attribute as follows:
• The login screen is defined in the /etc/one/sunstone-views.yaml.
• The logo of the main UI screen is defined for each view in
sunstone-views.yaml
OpenNebula Sunstone can be adapted to different user roles. For example, it will only show the resources the users have access to. Its behavior can be customized and extended via
The preferred method to select which views are available to each group is to update the group configuration from
Sunstone; as described in
Sunstone Views section . There is also the /etc/one/sunstone-views.yaml file that
defines an alternative method to set the view for each user or group.
Sunstone will calculate the views available to each user using:
• From all the groups the user belongs to, the views defined inside each group are combined and presented to the user
• If no views are available from the user’s group, the defaults would be fetched from /etc/one/ sunstone-views.yaml
. Here, views can be defined for:
– Each user (users: section), list each user and the set of views available for her.
– Each group (groups: section), list the set of views for the group.
– The default view, if a user is not listed in the users: section, nor its group in the groups: section, the default views will be used.
– The default views for group admins, if a group admin user is not listed in the users: section, nor its group in the groups: section, the default_groupadmin views will be used.
By default users in the oneadmin group have access to all views, and users in the users group can use the coud view.
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The following /etc/one/sunstone-views.yaml example enables the user (user.yaml) and the cloud
(cloud.yaml) views for helen and the cloud (cloud.yaml) view for group cloud-users. If more than one view is available for a given user the first one is the default.
---
logo: images/opennebula-sunstone-v4.0.png
users: helen:
- cloud
- user groups: cloud-users:
- cloud default:
- user default_groupadmin:
- groupadmin
- cloud
A Different Endpoint for Each View
OpenNebula
can be adapted to deploy a different endpoint for each kind of user. For example if you want an endpoint for the admins and a different one for the cloud users. You will just have to deploy a
and set a default view for each sunstone instance:
# Admin sunstone cat / etc / one / sunstone server .
conf
...
:host: admin .
sunstone .
com
...
cat / etc / one / sunstone views .
yaml
...
users: groups: default:
admin
# Users sunstone cat / etc / one / sunstone server .
conf
...
:host: user .
sunstone .
com
...
cat / etc / one / sunstone views .
yaml
...
users: groups: default:
user
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5.3 Sunstone Views
Using the OpenNebula Sunstone Views you will be able to provide a simplified UI aimed at end-users of an Open-
Nebula cloud. The OpenNebula Sunstone Views are fully customizable, so you can easily enable or disable specific information tabs or action buttons. You can define multiple views for different user groups. Each view defines a set of
UI components so each user just accesses and views the relevant parts of the cloud for her role.
The OpenNebula Sunstone Views can be grouped into two different layouts. On one hand, the classic Sunstone layout exposes a complete view of the cloud, allowing administrators and advanced users to have full control of any physical or virtual resource of the cloud. On the other hand, the cloud layout exposes a simplified version of the cloud where end-users will be able to manage any virtual resource of the cloud, without taking care of the physical resources management.
5.3.1 Default Views
Admin View
This view provides full control of the cloud. Details can be configured in the /etc/one/sunstone-views/ admin.yaml
file.
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Admin vCenter View
Based on the Admin View. It is designed to present the valid operations against a vCenter infrastructure to a cloud administrator. Details can be configured in the /etc/one/sunstone-views/admin_vcenter.yaml file.
Group Admin View
Based on the Admin View. It provides control of all the resources belonging to a group, but with no access to resources outside that group, that is, restricted to the physical and virtual resources of the group. This view features the ability to create new users within the group as well as set and keep track of user quotas. For more information on how to configure this scenario see this section
Cloud View
This is a simplified view mainly intended for end-users that just require a portal where they can provision new virtual machines easily from pre-defined Templates. For more information about this view, please check the /etc/one/ sunstone-views/cloud.yaml
file.
In this scenario the cloud administrator must prepare a set of templates and images and make them available to the cloud users. These Templates must be ready to be instantiated. Before using them, users can optionally customize the
VM capacity, add new network interfaces and provide values required by the template. Thereby, the user doesn’t have to know any details of the infrastructure such as networking or storage. For more information on how to configure this scenario see this section
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vCenter Cloud View
Based on the Cloud View, this view is designed to present the valid operations against a vCenter infrastructure to a cloud end-user.
User View
Based on the Admin View, it is an advanced user view. It is intended for users that need access to more actions that the limited set available in the cloud view. Users will not be able to manage nor retrieve the hosts and clusters of the cloud. They will be able to see Datastores and Virtual Networks in order to use them when creating a new
Image or Virtual Machine, but they will not be able to create new ones. Details can be configured in the /etc/one/ sunstone-views/user.yaml
file.
5.3.2 Configuring Access to the Views
By default, the admin view is only available to the oneadmin group. New users will be included in the users group and will use the default cloud view. The views assigned to a given group can be defined in the group creation form or updating an existing group to implement different OpenNebula models. For more information on the different
OpenNebula models please check the
Understanding OpenNebula documentation .
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5.3.3 Usage
Sunstone users can change their current view from the top-right drop-down menu:
They can also configure several options from the settings tab:
• Views: change between the different available views
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• Language: select the language that they want to use for the UI.
• Use secure websockets for VNC: Try to connect using secure websockets when starting VNC sessions.
• Display Name: If the user wishes to customize the username that is shown in Sunstone it is possible to so by adding a special parameter named SUNSTONE/DISPLAY_NAME with the desired value. It is worth noting that
Cloud Administrators may want to automate this with a hook on user create in order to fetch the user name from outside OpenNebula.
These options are saved in the user template, as well as other hidden settings like for instance the attribute that lets
Sunstone remember the number of items displayed in the datatables per user. If not defined, defaults from /etc/ one/sunstone-server.conf
are taken.
5.3.4 Defining a New OpenNebula Sunstone View or Customizing an Existing one
View definitions are placed in the /etc/one/sunstone-views directory. Each view is defined by a configuration file, in the form:
< view_name >.
yaml
The name of the view will be the filename without the yaml extension.
/etc/one/
...
|-- sunstone-views/
| |-- admin.yaml
| `-- cloud.yaml
`-- sunstone-views.yaml
...
<--- the admin view
<--- the cloud view
Note: The easiest way to create a custom view is to copy the admin.yaml or cloud.yaml file and then harden it
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as needed.
Admin View Customization
The contents of a view file specifies the enabled features, visible tabs, and enabled actions
For the dashboard, the following widgets can be configured:
# The following widgets can be used inside any of the '_per_row' settings
# bellow. As the name suggest, the widgets will be scaled to fit one,
# two, or three per row. The footer uses the widgets at full size, i.e.
# one per row.
#
# - storage
# - users
# - network
# - hosts
# - vms
# - groupquotas
# - quotas panel_tabs: actions:
Dashboard.refresh: false
Sunstone.toggle_top: false widgets_one_per_row:
- vms
- hosts
- users widgets_three_per_row: widgets_two_per_row:
- storage
- network widgets_one_footer:
Inside features there are two settings:
• showback: When this is false, all Showback features are hidden. The monthly report tables, and the cost for new VMs in the create VM wizard.
• secgroups: If true, the create VM wizard will allow to add security groups to each network interface.
features:
# True to show showback monthly reports, and VM cost showback: true
# Allows to change the security groups for each network interface
# on the VM creation dialog secgroups: true
This file also defines the tabs available in the view (note: tab is one of the main sections of the UI, those in the left-side menu). Each tab can be enabled or disabled by updating the enabled_tabs: attribute. For example to disable the
Clusters tab, comment the clusters-tab entry: enabled_tabs:
- dashboard-tab
- instances-top-tab
- vms-tab
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- oneflow-services-tab
- templates-top-tab
- templates-tab
- oneflow-templates-tab
- storage-top-tab
- datastores-tab
- images-tab
- files-tab
- marketplaces-tab
- marketplaceapps-tab
- network-top-tab
- vnets-tab
- vrouters-tab
- vnets-topology-tab
- secgroups-tab
- infrastructure-top-tab
#- clusters-tab
- hosts-tab
- zones-tab
- system-top-tab
- users-tab
- groups-tab
- vdcs-tab
- acls-tab
- settings-tab
- support-tab
Each tab can be tuned by selecting:
• The individual resource tabs available (panel_tabs: attribute) in the tab, these are the tabs activated when an object is selected (e.g. the information, or capacity tabs in the Virtual Machines tab).
• The columns shown in the main information table (table_columns: attribute).
• The action buttons available to the view (actions: attribute).
The attributes in each of the above sections should be self-explanatory. As an example, the following section defines a simplified datastore tab, without the info panel_tab and no action buttons: datastores-tab: panel_tabs: datastore_info_tab: false datastore_image_tab: true datastore_clusters_tab: false table_columns:
- 0 # Checkbox
- 1
- 2
- 3
# ID
# Owner
# Group
- 4
- 5
- 6
#- 7
#- 8
#- 9
- 10
- 11
#- 12 actions:
# Name
# Capacity
# Cluster
# Basepath
# TM
# DS
# Type
# Status
# Labels
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Datastore.refresh: true
Datastore.create_dialog: false
Datastore.import_dialog: false
Datastore.addtocluster: false
Datastore.rename: false
Datastore.chown: false
Datastore.chgrp: false
Datastore.chmod: false
Datastore.delete: false
Datastore.enable: false
Datastore.disable: false
Cloud View Customization
The cloud layout can also be customized by changing the corresponding /etc/one/sunstone-views/ yaml files. In this file you can customize the options available when instantiating a new template, the dashboard setup or the resources available for cloud users.
Features
• showback: When this is false, all Showback features are hidden. The monthly report tables, and the cost for new VMs in the create VM wizard.
• secgroups: If true, the create VM wizard will allow to add security groups to each network interface.
features:
# True to show showback monthly reports, and VM cost showback: true
# Allows to change the security groups for each network interface
# on the VM creation dialog secgroups: true
Resources
The list of VMs is always visible.
The list of VM Templates and OneFlow Services can be hidden with the provision_tabs setting.
tabs: provision-tab: provision_tabs: flows: true templates: true
Dashboard
The dashboard can be configured to show user’s quotas, group quotas, overview of user VMs, overview of group VMs tabs: dashboard:
# Connected user's quotas
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quotas: true
# Overview of connected user's VMs vms: true
# Group's quotas vdcquotas: false
# Overview of group's VMs vdcvms: false
Create VM Wizard
The create VM wizard can be configured with the following options: tabs: create_vm:
# True to allow capacity (CPU, MEMORY, VCPU) customization capacity_select: true
# True to allow NIC customization network_select: true
# True to allow DISK size customization disk_resize: true
Actions
The actions available for a given VM can be customized and extended by modifying the yaml file. You can even insert
VM panels from the admin view into this view, for example to use the disk snapshots or scheduled actions.
• Hiding the delete button tabs: provision-tab:
...
actions:
&provisionactions
...
VM.shutdown_hard: false
VM.delete: false
• Using undeploy instead of power off tabs: provision-tab:
...
actions:
&provisionactions
...
VM.poweroff: false
VM.poweroff_hard: false
VM.undeploy: true
VM.undeploy_hard: true
• Adding panels from the admin view, for example the disk snapshots tab tabs: provision-tab: panel_tabs:
...
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vm_snapshot_tab: true
...
...
actions:
&provisionactions
...
VM.disk_snapshot_create: true
VM.disk_snapshot_revert: true
VM.disk_snapshot_delete: true
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5.4 User Security and Authentication
By default Sunstone works with the core authentication method (user and password) although you can configure any authentication mechanism supported by OpenNebula. In this section you will learn how to enable other authentication methods and how to secure the Sunstone connections through SSL.
5.4.1 Authentication Methods
Authentication is two-folded:
• Web client and Sunstone server. Authentication is based on the credentials stored in the OpenNebula database for the user. Depending on the type of this credentials the authentication method can be: sunstone, x509 and opennebula (supporting LDAP or other custom methods).
• Sunstone server and OpenNebula core. The requests of a user are forwarded to the core daemon, including the original user name. Each request is signed with the credentials of an special server user. This authentication
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mechanism is based either in symmetric key cryptography (default) or x509 certificates. Details on how to configure these methods can be found in the
Cloud Authentication section .
The following sections details the client-to-Sunstone server authentication methods.
Basic Auth
In the basic mode, username and password are matched to those in OpenNebula’s database in order to authorize the user at the time of login. Rack cookie-based sessions are then used to authenticate and authorize the requests.
To enable this login method, set the :auth: option of /etc/one/sunstone-server.conf to sunstone:
:auth: sunstone
OpenNebula Auth
Using this method the credentials included in the header will be sent to the OpenNebula core and the authentication will be delegated to the OpenNebula auth system, using the specified driver for that user. Therefore any OpenNebula auth driver can be used through this method to authenticate the user (i.e: LDAP). The sunstone configuration is:
:auth: opennebula
x509 Auth
This method performs the login to OpenNebula based on a x509 certificate DN (Distinguished Name). The DN is extracted from the certificate and matched to the password value in the user database.
The user password has to be changed running one of the following commands:
$ oneuser chauth new_user x509 "/C=ES/O=ONE/OU=DEV/CN=clouduser" or the same command using a certificate file:
$ oneuser chauth new_user --x509 --cert /tmp/my_cert.pem
New users with this authentication method should be created as follows:
$ oneuser create new_user "/C=ES/O=ONE/OU=DEV/CN=clouduser" --driver x509 or using a certificate file:
$ oneuser create new_user --x509 --cert /tmp/my_cert.pem
To enable this login method, set the :auth: option of /etc/one/sunstone-server.conf to x509:
:auth: x509
The login screen will not display the username and password fields anymore, as all information is fetched from the user certificate:
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Note that OpenNebula will not verify that the user is holding a valid certificate at the time of login: this is expected to be done by the external container of the Sunstone server (normally Apache), whose job is to tell the user’s browser that the site requires a user certificate and to check that the certificate is consistently signed by the chosen Certificate
Authority (CA).
Warning: Sunstone x509 auth method only handles the authentication of the user at the time of login. Authentication of the user certificate is a complementary setup, which can rely on Apache.
Remote Auth
This method is similar to x509 auth. It performs the login to OpenNebula based on a Kerberos REMOTE_USER. The
USER@DOMAIN is extracted from REMOTE_USER variable and matched to the password value in the user database.
To use Kerberos authentication users needs to be configured with the public driver. Note that this will prevent users to authenticate through the XML-RPC interface, only Sunstone access will be granted to these users.
To update existing users to use the Kerberos authentication change the driver to public and update the password as follows:
$ oneuser chauth new_user public "new_user@DOMAIN"
New users with this authentication method should be created as follows:
$ oneuser create new_user "new_user@DOMAIN" --driver public
To enable this login method, set the :auth: option of /etc/one/sunstone-server.conf to remote:
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:auth: remote
The login screen will not display the username and password fields anymore, as all information is fetched from
Kerberos server or a remote authentication service.
Note that OpenNebula will not verify that the user is holding a valid Kerberos ticket at the time of login: this is expected to be done by the external container of the Sunstone server (normally Apache), whose job is to tell the user’s browser that the site requires a valid ticket to login.
Warning: Sunstone remote auth method only handles the authentication of the user at the time of login. Authentication of the remote ticket is a complementary setup, which can rely on Apache.
5.4.2 Configuring a SSL Proxy
OpenNebula Sunstone runs natively just on normal HTTP connections. If the extra security provided by SSL is needed, a proxy can be set up to handle the SSL connection that forwards the petition to the Sunstone server and takes back the answer to the client.
This set up needs:
• A server certificate for the SSL connections
• An HTTP proxy that understands SSL
• OpenNebula Sunstone configuration to accept petitions from the proxy
If you want to try out the SSL setup easily, you can find in the following lines an example to set a self-signed certificate to be used by a web server configured to act as an HTTP proxy to a correctly configured OpenNebula Sunstone.
Let’s assume the server where the proxy is going to be started is called cloudserver.org. Therefore, the steps are:
Step 1: Server Certificate (Snakeoil)
We are going to generate a snakeoil certificate. If using an Ubuntu system follow the next steps (otherwise your milleage may vary, but not a lot):
• Install the ssl-cert package
# apt-get install ssl-cert
• Generate the certificate
# /usr/sbin/make-ssl-cert generate-default-snakeoil
• As we are using lighttpd, we need to append the private key with the certificate to obtain a server certificate valid to lighttpd
# cat /etc/ssl/private/ssl-cert-snakeoil.key /etc/ssl/certs/ssl-cert-snakeoil.pem > /
˓→ etc/lighttpd/server.pem
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Step 2: SSL HTTP Proxy lighttpd
You will need to edit the /etc/lighttpd/lighttpd.conf configuration file and
• Add the following modules (if not present already)
– mod_access
– mod_alias
– mod_proxy
– mod_accesslog
– mod_compress
• Change the server port to 443 if you are going to run lighttpd as root, or any number above 1024 otherwise: server.port
= 8443
• Add the proxy module section:
#### proxy module
## read proxy.txt for more info proxy.server
= ( "" =>
("" =>
(
"host" => "127.0.0.1",
"port" => 9869
)
)
)
#### SSL engine ssl.engine
ssl.pemfile
= "enable"
= "/etc/lighttpd/server.pem"
The host must be the server hostname of the computer running the Sunstone server, and the port the one that the
Sunstone Server is running on.
nginx
You will need to configure a new virtual host in nginx.
Depending on the operating system and the method of installation, nginx loads virtual host configurations from either /etc/nginx/conf.d or /etc/nginx/ sites-enabled
.
• A sample cloudserver.org virtual host is presented next:
#### OpenNebula Sunstone upstream upstream sunstone { server 127.0.0.1:9869;
}
#### cloudserver.org HTTP virtual host server { listen 80;
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server_name cloudserver.org;
### Permanent redirect to HTTPS (optional) return 301 https://$server_name:8443;
}
#### cloudserver.org HTTPS virtual host server { listen 8443; server_name cloudserver.org;
### SSL Parameters ssl on; ssl_certificate /etc/ssl/certs/ssl-cert-snakeoil.pem; ssl_certificate_key /etc/ssl/private/ssl-cert-snakeoil.key;
### Proxy requests to upstream location / { proxy_pass http://sunstone;
}
}
The IP address and port number used in upstream must be the one of the server Sunstone is running on. On typical installations the nginx master process is run as user root so you don’t need to modify the HTTPS port.
Step 3: Sunstone Configuration
Edit /etc/one/sunstone-server.conf to listen at localhost:9869.
:host: 127.0.0.1
:port: 9869
Once the proxy server is started, OpenNebula Sunstone requests using HTTPS URIs can be directed to https:/
/cloudserver.org:8443
, that will then be unencrypted, passed to localhost, port 9869, satisfied (hopefully), encrypted again and then passed back to the client.
5.5 Cloud Servers Authentication
Todo
Mention oneflow
OpenNebula ships with two servers:
and EC2. When a user interacts with one of them, the server authenticates the request and then forwards the requested operation to the OpenNebula daemon.
The forwarded requests between the servers and the core daemon include the original user name, and are signed with the credentials of an special server user.
In this guide this request forwarding mechanism is explained, and how it is secured with a symmetric-key algorithm or x509 certificates.
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5.5.1 Server Users
The
and EC2 services communicate with the core using a server user. OpenNebula creates the serveradmin account at bootstrap, with the authentication driver server_cipher (symmetric key).
This server user uses a special authentication mechanism that allows the servers to perform an operation on behalf of other user.
You can strengthen the security of the requests from the servers to the core daemon changing the serveruser’s driver to server_x509. This is specially relevant if you are running your server in a machine other than the frontend.
Please note that you can have as many users with a server_* driver as you need. For example, you may want to have
Sunstone configured with a user with server_x509 driver, and EC2 with server_cipher.
5.5.2 Symmetric Key
Enable
This mechanism is enabled by default, you will have a user named serveradmin with driver server_cipher.
To use it, you need a user with the driver server_cipher. Enable it in the relevant configuration file in /etc/one:
•
Sunstone : /etc/one/sunstone-server.conf
• EC2: /etc/one/econe.conf
:core_auth: cipher
Configure
You must update the configuration files in /var/lib/one/.one if you change the serveradmin’s password, or create a different user with the server_cipher driver.
$ ls -1 /var/lib/one/.one
ec2_auth sunstone_auth
$ cat /var/lib/one/.one/sunstone_auth serveradmin:1612b78a4843647a4b541346f678f9e1b43bbcf9
Warning: serveradmin password is hashed in the database. You can use the --sha1 flag when issuing oneuser passwd command for this user.
Warning: When Sunstone is running in a different machine than oned you should use an SSL connection. This can be archived with an SSL proxy like stunnel or apache/nginx acting as proxy. After securing OpenNebula
XMLRPC connection configure Sunstone to use https with the proxy port:
:one_xmlrpc: https://frontend:2634/RPC2
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5.5.3 x509 Encryption
Enable
To enable it, change the authentication driver of the serveradmin user, or create a new user with the driver server_x509:
$ oneuser chauth serveradmin server_x509
$ oneuser passwd serveradmin --x509 --cert usercert.pem
The serveradmin account should look like:
$ oneuser list
ID GROUP NAME
˓→
PASSWORD
0 oneadmin oneadmin
AUTH core
˓→ c24783ba96a35464632a624d9f829136edc0175e
1 oneadmin serveradmin server_x
˓→
CN = server
/C = ES/O = ONE/OU = DEV/
You need to edit /etc/one/auth/server_x509_auth.conf and uncomment all the fields. The defaults should work:
# User to be used for x509 server authentication
:srv_user: serveradmin
# Path to the certificate used by the OpenNebula Services
# Certificates must be in PEM format
:one_cert: "/etc/one/auth/cert.pem"
:one_key: "/etc/one/auth/pk.pem"
Copy the certificate and the private key to the paths set in :one_cert: and :one_key:, or simply update the paths.
Then edit the relevant configuration file in /etc/one:
•
Sunstone : /etc/one/sunstone-server.conf
• EC2: /etc/one/econe.conf
:core_auth: x509
Configure
To trust the serveradmin certificate, /etc/one/auth/cert.pem if you used the default path, the CA’s certificate must be added to the ca_dir defined in /etc/one/auth/x509_auth.conf. See the
x509 Authentication guide for more information .
$ openssl x509 -noout -hash -in cacert.pem
78d0bbd8
$ sudo cp cacert.pem /etc/one/auth/certificates/78d0bbd8.0
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5.5.4 Tuning & Extending
Files
You can find the drivers in these paths:
• /var/lib/one/remotes/auth/server_cipher/authenticate
• /var/lib/one/remotes/auth/server_server/authenticate
Authentication Session String
OpenNebula users with the driver server_cipher or server_x509 use a special authentication session string (the first parameter of the XML-RPC calls). A regular authentication token is in the form: username:secret
Whereas a user with a server_* driver must use this token format: username:target_username:secret
The core daemon understands a request with this authentication session token as “perform this operation on behalf of target_user”. The secret part of the token is signed with one of the two mechanisms explained before.
5.6 Configuring Sunstone for Large Deployments
Low to medium enterprise clouds will typically deploy Sunstone in a single machine a long with the OpenNebula daemons. However this simple deployment can be improved by:
• Isolating the access from Web clients to the Sunstone server. This can be achieved by deploying the Sunstone server in a separated machine.
• Improve the scalability of the server for large user pools. Usually deploying sunstone in a separate application container in one or more hosts.
Check also the
as these of the tips also have an impact on Sunstone performance.
5.6.1 Deploying Sunstone in a Different Machine
By default the Sunstone server is configured to run in the frontend, but you are able to install the Sunstone server in a machine different from the frontend.
• You will need to install only the sunstone server packages in the machine that will be running the server. If you are installing from source use the -s option for the install.sh script.
• Make sure :one_xmlprc: variable in sunstone-server.conf points to the right place where Open-
Nebula frontend is running, You can also leave it undefined and export ONE_XMLRPC environment variable.
• Provide the serveradmin credentials in the following file /var/lib/one/.one/sunstone_auth. If you changed the serveradmin password please check the
Cloud Servers Authentication guide .
• If you want to upload files to OpenNebula, you will have to share the upload directory (/var/tmp by default
) between sunstone and oned. Some server do not take into account the TMPDIR env var and this directory must be defined in the configuration file, for example in Passenger (client_body_temp_path)
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$ cat /var/lib/one/.one/sunstone_auth serveradmin:1612b78a4843647a4b541346f678f9e1b43bbcf9
Using this setup the VirtualMachine logs will not be available. If you need to retrieve this information you must deploy the server in the frontend
5.6.2 Running Sunstone Inside Another Webserver
Self contained deployment of Sunstone (using sunstone-server script) is ok for small to medium installations.
This is no longer true when the service has lots of concurrent users and the number of objects in the system is high
(for example, more than 2000 simultaneous virtual machines).
Sunstone server was modified to be able to run as a rack server. This makes it suitable to run in any web server that supports this protocol. In ruby world this is the standard supported by most web servers. We now can select web servers that support spawning multiple processes like unicorn or embedding the service inside apache or nginx web servers using the Passenger module. Another benefit will be the ability to run Sunstone in several servers and balance the load between them.
Warning: Deploying Sunstone behind a proxy in a federated environment requires some specific configuration to properly handle the Sunstone headers required by the Federation.
• nginx: enable underscores_in_headers on; and proxy_pass_request_headers on;
Configuring memcached
When using one on these web servers the use of a memcached server is necessary. Sunstone needs to store user sessions so it does not ask for user/password for every action. By default Sunstone is configured to use memory sessions, that is, the sessions are stored in the process memory. Thin and webrick web servers do not spawn new processes but new threads an all of them have access to that session pool. When using more than one process to server
Sunstone there must be a service that stores this information and can be accessed by all the processes. In this case we will need to install memcached. It comes with most distributions and its default configuration should be ok. We will also need to install ruby libraries to be able to access it. The rubygem library needed is memcache-client. If there is no package for your distribution with this ruby library you can install it using rubygems:
$ sudo gem install memcache-client
Then you will have to change in sunstone configuration (/etc/one/sunstone-server.conf) the value of
:sessions to memcache.
If you want to use novcn you need to have it running. You can start this service with the command:
$ novnc-server start
Another thing you have to take into account is the user on which the server will run. The installation sets the permissions for oneadmin user and group and files like the Sunstone configuration and credentials can not be read by other users. Apache usually runs as www-data user and group so to let the server run as this user the group of these files must be changed, for example:
$ chgrp www-data /etc/one/sunstone-server.conf
$ chgrp www-data /etc/one/sunstone-plugins.yaml
$ chgrp www-data /var/lib/one/.one/sunstone_auth
$ chmod a+x /var/lib/one
$ chmod a+x /var/lib/one/.one
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$ chgrp www-data /var/log/one/sunstone*
$ chmod g+w /var/log/one/sunstone*
We advise to use Passenger in your installation but we will show you how to run Sunstone inside unicorn web server as an example.
For more information on web servers that support rack and more information about it you can check the rack documentation page. You can alternatively check a list of ruby web servers .
Running Sunstone with Unicorn
To get more information about this web server you can go to its web page . It is a multi process web server that spawns new processes to deal with requests.
The installation is done using rubygems (or with your package manager if it is available):
$ sudo gem install unicorn
In the directory where Sunstone files reside (/usr/lib/one/sunstone or /usr/share/opennebula/ sunstone ) there is a file called config.ru. This file is specific for rack applications and tells how to fun the application. To start a new server using unicorn you can run this command from that directory:
$ unicorn -p 9869
Default unicorn configuration should be ok for most installations but a configuration file can be created to tune it. For example, to tell unicorn to spawn 4 processes and write stderr to /tmp/unicorn.log we can create a file called unicorn.conf
that contains: worker_processes 4 logger debug stderr_path '/tmp/unicorn.log' and start the server and daemonize it using:
$ unicorn -d -p 9869 -c unicorn.conf
You can find more information about the configuration options in the unicorn documentation .
Running Sunstone with Passenger in Apache
Phusion Passenger is a module for Apache and Nginx web servers that runs ruby rack applications. This can be used to run Sunstone server and will manage all its life cycle. If you are already using one of these servers or just feel comfortable with one of them we encourage you to use this method. This kind of deployment adds better concurrency and lets us add an https endpoint.
We will provide the instructions for Apache web server but the steps will be similar for nginx following Passenger documentation .
First thing you have to do is install Phusion Passenger. For this you can use pre-made packages for your distribution or follow the installation instructions from their web page. The installation is self explanatory and will guide you in all the process, follow them an you will be ready to run Sunstone.
Next thing we have to do is configure the virtual host that will run our Sunstone server. We have to point to the public directory from the Sunstone installation, here is an example:
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< VirtualHost
*
: 80 >
ServerName sunstone server
PassengerUser oneadmin
# !!! Be sure to point DocumentRoot to 'public'!
DocumentRoot / usr / lib / one / sunstone / public
< Directory / usr / lib / one / sunstone / public >
# This relaxes Apache security settings.
AllowOverride all
# MultiViews must be turned off.
Options MultiViews
# Uncomment this if you're on Apache >= 2.4:
#Require all granted
</ Directory >
</ VirtualHost >
Note: When you’re experiencing login problems you might want to set PassengerMaxInstancesPerApp 1 in your passenger configuration or try memcached since Sunstone does not support sessions across multiple server instances.
Now the configuration should be ready, restart -or reload apache configuration- to start the application and point to the virtual host to check if everything is running.
Running Sunstone behind nginx SSL Proxy
How to set things up with nginx ssl proxy for sunstone and encrypted vnc.
# No squealing.
server_tokens off;
# OpenNebula Sunstone upstream upstream sunstone { server 127.0.0.1:9869;
}
# HTTP virtual host, redirect to HTTPS server { listen 80 default_server; return 301 https://$server_name:443;
}
# HTTPS virtual host, proxy to Sunstone server { listen 443 ssl default_server; ssl_certificate /etc/ssl/certs/opennebula-certchain.pem; ssl_certificate_key /etc/ssl/private/opennebula-key.pem; ssl_stapling on;
}
And this is the changes that have to be made to sunstone-server.conf:
UI Settings
:vnc_proxy_port: 29876
:vnc_proxy_support_wss: only
:vnc_proxy_cert: / etc / one / ssl / opennebula certchain .
pem
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:vnc_proxy_key: / etc / one / ssl / opennebula key .
pem
:vnc_proxy_ipv6: false
If using a selfsigned cert, the connection to VNC window in Sunstone will fail, either get a real cert, or manually accept the selfsigned cert in your browser before trying it with Sunstone. Now, VNC sessions should show “encrypted” in the title. You will need to have your browser trust that certificate, in both 443 and 29876 ports in the OpenNebula IP or FQDN.
Running Sunstone with Passenger using FreeIPA/Kerberos auth in Apache
It is also possible to use Sunstone remote authentication with Apache and Passenger. The configuration in this case is quite similar to Passenger configuration but we must include the Apache auth module line. How to configure freeIPA server and Kerberos is outside of the scope of this document, you can get more info in FreeIPA Apache setup example
As example to include Kerberos authentication we can use two different modules: mod_auth_gssapi or mod_authnz_pam And generate the keytab for http service, here is an example with Passenger:
LoadModule auth_gssapi_module modules / mod_auth_gssapi .
so
< VirtualHost
*
: 80 >
ServerName sunstone server
PassengerUser oneadmin
# !!! Be sure to point DocumentRoot to 'public'!
DocumentRoot / usr / lib / one / sunstone / public
< Directory / usr / lib / one / sunstone / public >
# Only is possible to access to this dir using a valid ticket
AuthType GSSAPI
AuthName "EXAMPLE.COM login"
GssapiCredStore keytab: / etc / http .
keytab
Require valid user
ErrorDocument 401 '<html><meta http-equiv="refresh" content="0; URL=https://
˓→ yourdomain"><body>Kerberos authentication did not pass.</body></html>'
AllowOverride all
# MultiViews must be turned off.
Options MultiViews
</ Directory >
</ VirtualHost >
Note: User must generate a valid ticket running kinit to get acces to Sunstone service. You can also set a custom
401 document to warn users about any authentication failure.
Now our configuration is ready to use Passenger and Kerberos, restart -or reload apache configuration- and point to the virtual host using a valid ticket to check if everything is running.
Running Sunstone in Multiple Servers
You can run Sunstone in several servers and use a load balancer that connects to them. Make sure you are using memcache for sessions and both Sunstone servers connect to the same memcached server. To do this change the parameter :memcache_host in the configuration file. Also make sure that both Sunstone instances connect to the same OpenNebula server.
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MarketPlace
If you plan on using the MarketPlaceApp download functionality the Sunstone server(s) will need access to the MarketPlace backends.
If you are using Phusion Passenger , take the following recommendations into account:
• Set PassengerResponseBufferHighWatermark to 0.
• Increase PassengerMaxPoolSize . Each MarketPlaceApp download will take one of this application processes.
• If Passenger Enterprise is available, set PassengerConcurrencyModel to thread.
If you are using another backend than Passenger, please port these recommendations to your backend.
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CHAPTER
SIX
VMWARE INFRASTRUCTURE SETUP
6.1 Overview
After configuring the OpenNebula front-end and the vCenter nodes, the next step is to learn what capabilities can be leveraged from the vCenter infrastructure and fine tune the OpenNebula cloud to make use of them.
The Virtualization Subsystem is the component in charge of talking with the hypervisor and taking the actions needed for each step in the VM life-cycle. This Chapter gives a detailed view of the vCenter drivers, the resources it manages and how to setup OpenNebula to leverage different vCenter features.
6.1.1 How Should I Read This Chapter
You should be reading this chapter after performing the
This Chapter is organized in the
vCenter Node Section , which introduces the vCenter integration approach under
the point of view of OpenNebula, with description of how to import, create and use VM Templates, resource pools, limitations and so on; the
section that glosses over the network consumption and usage and then the
which introduces the concepts of OpenNebula datastores as related to vCenter datastores, and the VMDK image management made by OpenNebula.
After reading this Chapter, you can delve on advanced topics like OpenNebula upgrade, logging, scalability in the
. The next step should be proceeding to the Operations guide to learn how the Cloud users can
consume the cloud resources that have been set up.
6.1.2 Hypervisor Compatibility
All this Chapter applies exclusively to vCenter hypervisor.
6.2 vCenter Node
The vCenter driver for OpenNebula enables the interaction with vCenter to control the life-cycle of vCenter resources such as Virtual Machines, Templates, Networks and VMDKs.
6.2.1 OpenNebula approach to vCenter interaction
OpenNebula consumes resources from vCenter, and with exceptions (VMs and VMDKs) does not create these resources, but rather offers mechanisms to import them into OpenNebula to be controlled.
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Virtual Machines are deployed from VMware VM Templates that must exist previously in vCenter. There is a oneto-one relationship between each VMware VM Template and the equivalent OpenNebula Template. Users will then instantiate the OpenNebula Templates where you can easily build from any provisioning strategy (e.g. access control, quota...).
Networking is handled by creating Virtual Network representations of the vCenter networks. OpenNebula additionally can handle on top of these networks three types of Address Ranges: Ethernet, IPv4 and IPv6. This networking information can be passed to the VMs through the contextualization process.
Therefore there is no need to convert your current Virtual Machines or import/export them through any process; once ready just save them as VM Templates in vCenter, following this procedure .
There are different behavior of the vCenter resources when deleted in OpenNebula. The following resources are NOT deleted in vCenter when deleted in OpenNebula:
• VM Templates
• Networks
• Datastores
The following resource are deleted in vCenter when deleted in OpenNebula:
• Images
• Virtual Machines
Note: After a VM Template is cloned and booted into a vCenter Cluster it can access VMware advanced features and it can be managed through the OpenNebula provisioning portal -to control the life-cycle, add/remove NICs, make snapshots- or through vCenter (e.g. to move the VM to another datastore or migrate it to another ESX). OpenNebula will poll vCenter to detect these changes and update its internal representation accordingly.
6.2.2 Considerations & Limitations
• Unsupported Operations: The following operations are NOT supported on vCenter VMs managed by Open-
Nebula, although they can be performed through vCenter:
Operation Note migrate VMs cannot be migrated between ESX clusters disk snapshots Only system snapshots are available for vCenter VMs
• No Security Groups: Firewall rules as defined in Security Groups cannot be enforced in vCenter VMs.
• OpenNebula treats snapshots a tad different than VMware. OpenNebula assumes that they are independent, whereas VMware builds them incrementally. This means that OpenNebula will still present snapshots that are no longer valid if one of their parent snapshots are deleted, and thus revert operations applied upon them will fail.
• No files in context: Passing entire files to VMs is not supported, but all the other CONTEXT sections will be honored.
• Cluster names cannot contain spaces.
• Image names cannot contain spaces.
• Datastore names cannot contain spaces.
• vCenter credential password cannot have more than 22 characters.
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• If you are running Sunstone using nginx/apache you will have to forward the following headers to be able to interact with vCenter, HTTP_X_VCENTER_USER, HTTP_X_VCENTER_PASSWORD and
HTTP_X_VCENTER_HOST (or, alternatively, X_VCENTER_USER, X_VCENTER_PASSWORD and
X_VCENTER_HOST). For example in nginx you have to add the following attrs to the server section of your nginx file: (underscores_in_headers on; proxy_pass_request_headers on;).
• Attaching a new CDROM ISO will add a new (or change the existing) ISO to an already existing CDROM drive that needs to be present in the VM.
6.2.3 Configuring
The vCenter virtualization driver configuration file is located in /etc/one/vmm_exec/vmm_exec_vcenter.
conf . This file is home for default values for OpenNebula VM templates.
It is generally a good idea to place defaults for the vCenter-specific attributes, that is, attributes mandatory in the vCenter driver that are not mandatory for other hypervisors. Non mandatory attributes for vCenter but specific to them are also recommended to have a default.
6.2.4 Importing vCenter VM Templates and running VMs
The onevcenter tool can be used to import existing VM templates from the ESX clusters:
$ onevcenter templates --vcenter <vcenter-host> --vuser <vcenter-username> --vpass
˓→
<vcenter-password>
Connecting to vCenter: <vcenter-host>...done!
Looking
for
VM Templates...done!
Do you want to process datacenter Development [ y/n ] ? y
* VM Template found:
- Name : ttyTemplate
- UUID : 421649f3-92d4-49b0-8b3e-358abd18b7dc
- Cluster: clusterA
Import this VM template [ y/n ] ? y
OpenNebula template 4 created!
* VM Template found:
- Name : Template test
- UUID : 4216d5af-7c51-914c-33af-1747667c1019
- Cluster: clusterB
Import this VM template [ y/n ] ? y
OpenNebula template 5 created!
$ onetemplate list
ID USER
4 oneadmin
5 oneadmin
GROUP oneadmin oneadmin
NAME ttyTemplate
Template test
$ onetemplate show 5
TEMPLATE 5 INFORMATION
ID
NAME
: 5
: Template test
USER
GROUP
: oneadmin
: oneadmin
REGTIME
09/22 11:54:33
09/22 11:54:35
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REGISTER TIME : 09/22 11:54:35
PERMISSIONS
OWNER
GROUP
OTHER
: um-
: ---
: ---
TEMPLATE CONTENTS
CPU = "1"
MEMORY = "512"
PUBLIC_CLOUD =[
TYPE = "vcenter" ,
VM_TEMPLATE = "4216d5af-7c51-914c-33af-1747667c1019" ]
SCHED_REQUIREMENTS = "NAME=\"devel\""
VCPU = "1"
After a vCenter VM Template is imported as a OpenNebula VM Template, it can be modified to change the capacity in terms of CPU and MEMORY, the name, permissions, etc. It can also be enriched to add:
• New disks
• New network interfaces
• Context information
Before using your OpenNebula cloud you may want to read about the vCenter specifics.
To import existing VMs, the ‘onehost importvm’ command can be used. VMs in running state can be imported, and also VMs defined in vCenter that are not in power.on state (this will import the VMs in OpenNebula as in the poweroff state).
$ onehost show 0
HOST 0 INFORMATION
ID
NAME
CLUSTER
[ ....
]
: 0
: MyvCenterHost
: -
WILD VIRTUAL MACHINES
NAME IMPORT_ID CPU
RunningVM 4223cbb1-34a3-6a58-5ec7-a55db235ac64 1
[ ....
]
$ onehost importvm 0 RunningVM
$ onevm list
ID USER GROUP NAME
3 oneadmin oneadmin RunningVM
STAT UCPU runn 0
UMEM HOST
MEMORY
1024
TIME
590M MyvCenterHost 0d 01h02
After a Virtual Machine is imported, their life-cycle (including creation of snapshots) can be controlled through Open-
Nebula. The following operations cannot be performed on an imported VM:
• Recover –recreate
• Undeploy (and Undeploy –hard)
• Migrate (and Migrate –live)
• Stop
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Running VMs with open VNC ports are imported with the ability to establish VNC connection to them via OpenNebula. To activate the VNC ports, you need to right click on the VM in vCenter while it is shut down and click on “Edit
Settings”, and set the following remotedisplay.* settings:
• remotedisplay.vnc.enabled must be set to TRUE.
• remotedisplay.vnc.ip must be set to 0.0.0.0 (or alternatively, the IP of the OpenNebula front-end).
• remotedisplay.vnc.port must be set to a available VNC port number.
Also, network management operations are present like the ability to attach/detach network interfaces, as well as capacity (CPU and MEMORY) resizing operations and VNC connections if the ports are opened before hand. The same import mechanism is available graphically through Sunstone for hosts, networks, templates and running VMs.
vCenter hosts can be imported using the vCenter host create dialog.
Networks and VM Templates can be imported through the Import button in the Networks -> Virtual Networks and
Templates -> VM menu entries respectively.
Note:
The Import button will be available once the one_vcenter view is enabled in Sunstone. To do so, click on your user’s name (Sunstone’s top-right). A drop-down menu will be shown. Then click on views and finally click on admin_vcenter.
Running and Powered Off VMs can be imported through the WILDS tab in the Host info tab.
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Note: Running VMS can only be imported after the vCenter host has been successfully acquired.
6.2.5 Resource Pool
OpenNebula can place VMs in different Resource Pools. There are two approaches to achieve this, fixed per Cluster basis or flexible per VM Template basis.
In the fixed per Cluster basis approach, the vCenter credentials that OpenNebula use can be confined into a Resource
Pool, to allow only a fraction of the vCenter infrastructure to be used by OpenNebula users. The steps to confine
OpenNebula users into a Resource Pool are:
• Create a new vCenter user
• Create a Resource Pool in vCenter and assign the subset of Datacenter hardware resources wanted to be exposed through OpenNebula
• Give vCenter user Resource Pool Administration rights over the Resource Pool
• Give vCenter user Resource Pool Administration (or equivalent) over the Datastores the VMs are going to be running on
Afterwards, these credentials can be used to add to OpenNebula the host representing the vCenter cluster. Add a new tag called VCENTER_RESOURCE_POOL to the host template representing the vCenter cluster (for instance, in the info tab of the host, or in the CLI), with the name of the Resource Pool.
The second approach is more flexible in the sense that all Resource Pools defined in vCenter can be used, and the mechanism to select which one the VM is going to reside into can be defined using the attribute RESOURCE_POOL
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in the OpenNebula VM Template:
Nested Resource Pools can be represented using ‘/’. For instance, a Resource Pool “RPChild” nested under “RPAncestor” can be represented both in VCENTER_RESOURCE_POOL and RESOURCE_POOL attributes as “RPAncestor/RPChild”.
RESOURCE_POOL = "RPAncestor/RPChild"
PUBLIC_CLOUD = [
HOST = "Cluster" ,
TYPE = "vcenter" ,
VM_TEMPLATE = "4223067b-ed9b-8f73-82ba-b1a98c3ff96e" ]
6.3 vCenter Datastore
The vCenter datastore allows the representation in OpenNebula of VMDK images available in vCenter datastores. It is a persistent only datastore, meaning that VMDK images are not cloned automatically by OpenNebula when a VM is instantiated. vCenter handles the VMDK image copies, so no system datastore is needed in OpenNebula, and only vCenter image datastores are allowed.
No system datastore is needed since the vCenter support in OpenNebula does not rely on transfer managers to copy
VMDK images, but rather this is delegated to vCenter. When a VM Template is instantiated, vCenter performs the
VMDK copies, and deletes them after the VM ends its life-cycle. The OpenNebula vCenter datastore is a purely persistent images datastore to allow for VMDK cloning and enable disk attach/detach on running VMs.
The vCenter datastore in OpenNebula is tied to a vCenter OpenNebula host in the sense that all operations to be performed in the datastore are going to be performed through the vCenter instance associated to the OpenNebula host, which happens to hold the needed credentials to access the vCenter instance.
Creation of empty datablocks and VMDK image cloning are supported, as well as image deletion.
6.3.1 Limitations
• No support for snapshots in the vCenter datastore.
• Only one disk is allowed per directory in the vCenter datastores.
• Datastore names cannot contain spaces.
• Image names and paths cannot contain spaces.
6.3.2 Requirements
In order to use the vCenter datastore, the following requirements need to be met:
• All the ESX servers controlled by vCenter need to mount the same VMFS datastore with the same name.
• The ESX servers need to be part of the Cluster controlled by OpenNebula
6.3.3 Configuration
In order to create a OpenNebula vCenter datastore that represents a vCenter VMFS datastore, a new OpenNebula datastore needs to be created with the following attributes:
• The OpenNebula vCenter datastore name needs to be exactly the same as the vCenter VMFS datastore available in the ESX hosts.
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• The specific attributes for this datastore driver are listed in the following table:
Attribute Description
DS_MAD
Must be set to vcenter
TM_MAD
Must be set vcenter mount the represented VMFS datastore is inherited by images and can be overwritten if specified explicitly in the image. Possible values
(careful with the case): lsiLogic, ide, busLogic. More information in the VMware documentation .
Known as “Bus adapter controller” in Sunstone.
DISK_TYPE
Type of disk to be created when a DATABLOCK is requested. This value is inherited from the datastore to the image but can be explicitly overwritten. The type of disk has implications on performance and occupied space. Values (careful with the case): delta,eagerZeroedThick,flatMonolithic,preallocated,raw,rdm,rdmp,seSparse,sparse2Gb,sparseMonolithic,thick,thick2Gb,thin.
More information in the VMware documentation . Known as “Disk Provisioning Type” in Sunstone.
vCenter datastores can be represented in OpenNebula to achieve the following VM operations:
• Choose a different datastore for VM deployment
• Clone VMDKs images
• Create empty datablocks
• Delete VMDK images
All OpenNebula datastores are actively monitoring, and the scheduler will refuse to deploy a VM onto a vCenter datastore with insufficient free space.
The onevcenter tool can be used to import vCenter datastores:
$ onevcenter datastores --vuser <VCENTER_USER> --vpass <VCENTER_PASS> --vcenter
˓→
<VCENTER_FQDN>
Connecting to vCenter: vcenter.vcenter3...done!
Looking
for
Datastores...done!
Do you want to process datacenter Datacenter [ y/n ] ? y
* Datastore found:
- Name : datastore2
- Total MB : 132352
- Free MB : 130605
- Cluster : Cluster
Import this Datastore [ y/n ] ? y
OpenNebula datastore 100 created!
6.3.4 Storage DRS and datastore cluster
Storage DRS allows you to manage the aggregated resources of a datastore cluster. A StoragePod data object aggregates the storage resources of associated Datastores in a datastore cluster managed by Storage DRS.
In OpenNebula, a StoragePod can be imported as a datastore using Sunstone or CLI’s onevcenter datastore command.
The StoragePod will be imported as a SYSTEM datastore so it won’t be possible to use it to store images but it will be possible to deploy VMs on it.
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Datastores which are member of the cluster, represented by the StoragePod, can be imported as individual IMAGE datastores where VMs can be deployed and images can be stored.
Current support has the following limitations:
• Images in StoragePods can’t be imported through Sunstone or CLI’s onevcenter command though it’s possible to import them from a datastore, which is a member of a storage cluster, if it has been imported previously as an individual datastore.
• New images like VMDK files cannot be created or uploaded to the StoragePod as it’s set as a SYSTEM datastore.
However, it’s possible to create an image and upload it to a datastore which is a member of a storage cluster it has been imported previously as an individual datastore.
Warning: When a VM is deployed, a cloning operation is involved. The moveAllDisksBackingsAndDisallow-
Sharing move type is used when target datastore is a StoragePod. According to VMWare’s documentation all of the virtual disk’s backings should be moved to the new datastore. It is not acceptable to attach to a disk backing with the same content ID on the destination datastore. During a clone operation any delta disk backings will be consolidated. The moveChildMostDiskBacking is used for datastores which are not StoragePods in the cloning operation.
Warning: If you import a StorageDRS cluster you must edit /etc/one/oned.conf and add vcenter the -s argument list in the DATASTORE_MAD section so the StorageDRS cluster can be monitored as a SYSTEM datastore:
DATASTORE_MAD = [
EXECUTABLE = "one_datastore" ,
]
ARGUMENTS = "-t 15 -d dummy,fs,lvm,ceph,dev,iscsi_libvirt,vcenter -s shared,ssh,
˓→ ceph,fs_lvm,qcow2,vcenter"
6.3.5 Tuning and Extending
Drivers can be easily customized please refer to the specific guide for each datastore driver or to the Storage subsystem developer’s guide.
However you may find the files you need to modify here:
• /var/lib/one/remotes/datastore/vcenter
• /var/lib/one/remotes/tm/vcenter
6.4 vCenter Networking
Virtual Networks from vCenter can be represented using OpenNebula networks, taking into account that the BRIDGE of the Virtual Network needs to match the name of the Network defined in vCenter. OpenNebula supports both “Port
Groups” and “Distributed Port Groups”, and as such can consume any vCenter defined network resource (even those created by other networking components like for instance NSX).
Virtual Networks in vCenter can be created using the vCenter web client, with any specific configuration like for instance VLANs. OpenNebula will use these networks with the defined characteristics, but it cannot create new Virtual
Networks in vCenter, but rather only OpenNebula representations of such Virtual Networks. OpenNebula additionally can handle on top of these networks three types of Address Ranges: Ethernet, IPv4 and IPv6.
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vCenter VM Templates can define their own NICs, and OpenNebula will not manage them. However, any NIC added in the OpenNebula VM Template, or through the attach_nic operation, will be handled by OpenNebula, and as such it is subject to be detached and its information (IP, MAC, etc) is known by OpenNebula.
vCenter VM Templates with already defined NICs that reference Networks in vCenter will be imported without this information in OpenNebula. These NICs will be invisible for OpenNebula, and therefore cannot be detached from the VMs. The imported VM Templates in OpenNebula can be updated to add NICs from Virtual Networks imported from vCenter (being Networks or Distributed vSwitches). We recommend therefore to use VM Templates in vCenter without defined NICs, to add them later on in the OpenNebula VM Templates
6.4.1 Importing vCenter Networks
The onevcenter tool can be used to import existing Networks and distributed vSwitches from the ESX clusters:
$ onevcenter networks --vcenter <vcenter-host> --vuser <vcenter-username> --vpass
˓→
<vcenter-password>
Connecting to vCenter: <vcenter-host>...done!
Looking
for
vCenter networks...done!
Do you want to process datacenter vOneDatacenter [ y/n ] ? y
* Network found:
- Name : MyvCenterNetwork
- Type : Port Group
Import this Network [ y/n ] ? y
How many VMs are you planning to fit into this network [ 255 ] ? 45
What type of Virtual Network
do
you want to create ( IPv [ 4 ] ,IPv [ 6 ] , [ E ] thernet ) ? E
Please input the first MAC in the range [ Enter
for
default ] :
OpenNebula virtual network 29 created with size 45!
$ onevnet list
ID USER
29 oneadmin
GROUP oneadmin
$ onevnet show 29
VIRTUAL NETWORK 29 INFORMATION
ID
NAME
: 29
: MyvCenterNetwork
USER
GROUP
CLUSTER
BRIDGE
VLAN
USED LEASES
: oneadmin
: oneadmin
: -
: MyvCenterNetwork
: No
: 0
NAME
MyvCenterNetwork
PERMISSIONS
OWNER
GROUP
OTHER
: um-
: ---
: ---
VIRTUAL NETWORK TEMPLATE
BRIDGE = "MyvCenterNetwork"
PHYDEV = ""
VCENTER_TYPE = "Port Group"
VLAN = "NO"
CLUSTER
-
BRIDGE
MyFakeNe
LEASES
0
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VLAN_ID = ""
ADDRESS RANGE POOL
AR TYPE
0 ETHER
SIZE LEASES
45
MAC
0 02:00:97:7f:f0:87
LEASES
AR OWNER MAC IP
The same import mechanism is available graphically through Sunstone
IP
-
GLOBAL_PREFIX
-
IP6_GLOBAL
6.4.2 Network monitoring
OpenNebula gathers network monitoring info for each VM. Real-time data is retrieved from vCenter thanks to the
Performance Manager which collects data every 20 seconds and maintains it for one hour. Real-time samples are used so no changes have to be applied to vCenter’s Statistics setings. Network metrics for transmitted and received traffic are provided as an average using KB/s unit.
The graphs provided by Sunstone are different from those found in vCenter under the Monitor -> Performance Tab when selecting Realtime in the Time Range drop-down menu or in the Advanced view selecting the Network View.
The reason is that Sunstone uses polling time as time reference while vCenter uses sample time on their graphs, so an approximation to the real values aggregating vCenter’s samples between polls is needed. As a result, upload and download peaks will be different in value and different peaks between polls won’t be depicted. Sunstone’s graphs will provide a useful information about networking behaviour which can be examined on vCenter later with greater detail.
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CHAPTER
SEVEN
OPEN CLOUD HOST SETUP
7.1 Overview
The Hosts are servers with a hypervisor installed (KVM) which execute the running Virtual Machines. These Hosts are managed by the KVM Driver, which will perform the actions needed to manage the VM and its life-cycle. This chapter analyses the KVM driver in detail, and will give you, amongst other things, the tools to configure and add
KVM hosts into the OpenNebula Cloud.
7.1.1 How Should I Read This Chapter
Before reading this chapter, you should have already installed your
and have an OpenNebula cloud up and running with at least one virtualization node.
This chapter will focus on the configuration options for the Hosts.
• Read the
section in order to understand the procedure of configuring and managing kvm Hosts.
• In the
section, you can find information about how OpenNebula is monitoring its Hosts and Virtual
Machines, and changes you can make in the configuration of that subsystem.
• You can read this section if you are interested in performing
After reading this chapter, you should read the
chapter.
7.1.2 Hypervisor Compatibility
This chapter applies only to KVM.
Follow the
section for a similar guide for vCenter.
7.2 KVM Driver
KVM (Kernel-based Virtual Machine) is the hypervisor for OpenNebula’s
plete virtualization system for Linux. It offers full virtualization, where each Virtual Machine interacts with its own virtualized hardware. This guide describes the use of the KVM with OpenNebula.
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7.2.1 Requirements
The Hosts will need a CPU with Intel VT or AMD’s AMD-V features, in order to support virtualization. KVM’s
Preparing to use KVM guide will clarify any doubts you may have regarding if your hardware supports KVM.
KVM will be installed and configured after following the
section.
7.2.2 Considerations & Limitations
Try to use
whenever possible, both for networks and disks. Using emulated hardware, both for networks and disks, will have an impact in performance and will not expose all the available functionality. For instance, if you don’t use virtio for the disk drivers, you will not be able to exceed a small number of devices connected to the controller, meaning that you have a limit when attaching disks, and it will not work while the VM is running (live disk-attach).
7.2.3 Configuration
KVM Configuration
The OpenNebula packages will configure KVM automatically, therefore you don’t need to take any extra steps.
Drivers
The KVM driver is enabled by default in OpenNebula:
#-------------------------------------------------------------------------------
# KVM Virtualization Driver Manager Configuration
#
#
#
-r number of retries when monitoring a host
-t number of threads, i.e. number of hosts monitored at the same time
-l <actions[=command_name]> actions executed locally, command can be
#
#
#
# overridden for each action.
Valid actions: deploy, shutdown, cancel, save, restore, migrate, poll
An example: "-l migrate=migrate_local,save"
-p more than one action per host in parallel, needs support from hypervisor
-s <shell> to execute remote commands, bash by default #
#
# Note: You can use type = "qemu" to use qemu emulated guests, e.g. if your
# CPU does not have virtualization extensions or use nested Qemu-KVM hosts
#-------------------------------------------------------------------------------
VM_MAD = [
NAME = "kvm" ,
SUNSTONE_NAME = "KVM" ,
EXECUTABLE = "one_vmm_exec" ,
ARGUMENTS
DEFAULT
TYPE
= "-t 15 -r 0 kvm" ,
= "vmm_exec/vmm_exec_kvm.conf" ,
= "kvm" ,
KEEP_SNAPSHOTS = "no" ,
IMPORTED_VMS_ACTIONS = "terminate, terminate-hard, hold, release, suspend, resume, delete, reboot, reboot-hard, resched, unresched, disk-attach, disk-detach, nic-attach, nic-detach, snap-create, snap-delete"
]
The configuration parameters: -r, -t, -l, -p and -s are already preconfigured with sane defaults. If you change them you will need to restart OpenNebula.
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Read the Virtual Machine Drivers Reference for more information about these parameters, and how to customize and extend the drivers.
Driver Defaults
There are some attributes required for KVM to boot a VM. You can set a suitable defaults for them so, all the VMs get needed values. These attributes are set in /etc/one/vmm_exec/vmm_exec_kvm.conf. The following can be set for KVM:
• EMULATOR: path to the kvm executable.
• OS: attributes KERNEL, INITRD, BOOT, ROOT, KERNEL_CMD, MACHINE and ARCH.
• VCPU
• FEATURES: attributes ACPI, PAE.
• DISK: attributes DRIVER and CACHE. All disks will use that driver and caching algorithm.
• NIC: attribute FILTER.
• RAW: to add libvirt attributes to the domain XML file.
• HYPERV: to enable hyperv extensions.
• SPICE: to add default devices for SPICE.
For example:
OS = [ ARCH = "x86_64" ]
FEATURES = [ PAE = "no" , ACPI = "yes" , APIC = "no" , HYPERV = "no" , GUEST_AGENT = "no"
˓→
]
DISK = [ DRIVER = "raw" , CACHE = "none" ]
HYPERV_OPTIONS = "<relaxed state='on'/><vapic state='on'/><spinlocks state='on' retries=
˓→
'4096'/>"
SPICE_OPTIONS = "
< video >
< model type = 'qxl' heads = '1' />
</ video >
< sound model = 'ich6' />
< channel type = 'spicevmc' >
< target type = 'virtio' name = 'com.redhat.spice.0' />
</ channel >
< redirdev bus = 'usb' type = 'spicevmc' />
< redirdev bus = 'usb' type = 'spicevmc' />
< redirdev bus = 'usb' type = 'spicevmc' /> "
Note: These values can be overriden in the VM Template
Live-Migration for Other Cache settings
In case you are using disks with a cache setting different to none you may have problems with live migration depending on the libvirt version. You can enable the migration adding the --unsafe parameter to the virsh command.
The file to change is /var/lib/one/remotes/vmm/kvm/kvmrc. Uncomment the following line, and execute onehost sync --force afterwards:
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MIGRATE_OPTIONS = --unsafe
Configure the Timeouts (Optional)
Optionally, you can set a timeout for the VM Shutdown operation can be set up. This feature is useful when a VM gets stuck in Shutdown (or simply does not notice the shutdown command). By default, after the timeout time the VM will return to Running state but is can also be configured so the VM is destroyed after the grace time. This is configured in
/var/lib/one/remotes/vmm/kvm/kvmrc :
# Seconds to wait after shutdown until timeout export SHUTDOWN_TIMEOUT = 300
# Uncomment this line to force VM cancellation after shutdown timeout
#export FORCE_DESTROY=yes
Working with cgroups (Optional)
Warning: This section outlines the configuration and use of cgroups with OpenNebula and libvirt/KVM. Please refer to the cgroups documentation of your Linux distribution for specific details.
Cgroups is a kernel feature that allows you to control the amount of resources allocated to a given process (among other things). This feature can be used to enforce the amount of CPU assigned to a VM, as defined in its template. So, thanks to cgroups a VM with CPU=0.5 will get half of the physical CPU cycles than a VM with CPU=1.0.
Cgroups can be also used to limit the overall amount of physical RAM that the VMs can use, so you can leave always a fraction to the host OS.
The following outlines the steps need to configure cgroups, this should be performed in the hosts, not in the frontend:
• Define where to mount the cgroup controller virtual file systems, at least memory and cpu are needed.
• (Optional) You may want to limit the total memory devoted to VMs. Create a group for the libvirt processes
(VMs) and the total memory you want to assign to them. Be sure to assign libvirt processes to this group, e.g.
wih CGROUP_DAEMON or in cgrules.conf. Example:
# /etc/cgconfig.conf
group virt { memory { memory .
limit_in_bytes = 5120 M;
}
} mount { cpu = / mnt / cgroups / cpu; memory = / mnt / cgroups / memory; cpuset = / mnt / cgroups / cpuset; devices = / mnt / cgroups / devices; blkio = / mnt / cgroups / blkio; cpuacct = / mnt / cgroups / cpuacct;
}
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# /etc/cgrules.conf
*
:libvirtd memory virt /
• Enable cgroups support in libvirt by adding this configuration to /etc/libvirt/qemu.conf:
# /etc/libvirt/qemu.conf
cgroup_controllers = [ "cpu" , "devices" , "memory" , "blkio" , "cpuset" , "cpuacct" ] cgroup_device_acl = [
"/dev/null" , "/dev/full" , "/dev/zero" ,
"/dev/random" , "/dev/urandom" ,
"/dev/ptmx" , "/dev/kvm" , "/dev/kqemu" ,
"/dev/rtc" , "/dev/hpet" , "/dev/vfio/vfio"
]
• After configuring the hosts start/restart the cgroups service then restart the libvirtd service.
• (Optional) If you have limited the amount of memory for VMs, you may want to set RESERVED_MEM parameter in host or cluster templates.
That’s it. OpenNebula automatically generates a number of CPU shares proportional to the CPU attribute in the VM template. For example, consider a host running 2 VMs (73 and 74, with CPU=0.5 and CPU=1) respectively. If everything is properly configured you should see:
/mnt/cgroups/cpu/sysdefault/libvirt/qemu/
|-- cgroup.event_control
...
|-- cpu.shares
|-- cpu.stat
|-- notify_on_release
|-- one-73
| |-- cgroup.clone_children
| |-- cgroup.event_control
| |-- cgroup.procs
| |-- cpu.shares
| ...
| `-- vcpu0
|
|
|-- cgroup.clone_children
...
|-- one-74
| |-- cgroup.clone_children
| |-- cgroup.event_control
| |-- cgroup.procs
| |-- cpu.shares
| ...
| `-- vcpu0
|
|
|-- cgroup.clone_children
...
`-- tasks and the cpu shares for each VM:
> cat / mnt / cgroups / cpu / sysdefault / libvirt / qemu / one 73 / cpu .
shares
512
> cat / mnt / cgroups / cpu / sysdefault / libvirt / qemu / one 74 / cpu .
shares
1024
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VCPUs are not pinned so most probably the virtual process will be changing the core it is using. In an ideal case where the VM is alone in the physical host the total amount of CPU consumed will be equal to VCPU plus any overhead of virtualization (for example networking). In case there are more VMs in that physical node and is heavily used then the
VMs will compete for physical CPU time. In this case cgroups will do a fair share of CPU time between VMs (a VM with CPU=2 will get double the time as a VM with CPU=1).
In case you are not overcommiting (CPU=VCPU) all the virtual CPUs will have one physical CPU (even if it’s not pinned) so they could consume the number of VCPU assigned minus the virtualization overhead and any process running in the host OS.
7.2.4 Usage
KVM Specific Attributes
The following are template attributes specific to KVM, please refer to the template reference documentation for a complete list of the attributes supported to define a VM.
DISK
• TYPE: This attribute defines the type of the media to be exposed to the VM, possible values are: disk (default), cdrom or floppy. This attribute corresponds to the media option of the -driver argument of the kvm command.
• DRIVER: specifies the format of the disk image; possible values are raw, qcow2... This attribute corresponds to the format option of the -driver argument of the kvm command.
• CACHE: specifies the optional cache mechanism, possible values are default, none, writethrough and writeback .
• IO: set IO policy possible values are threads and native.
NIC
• TARGET: name for the tun device created for the VM. It corresponds to the ifname option of the ‘-net’ argument of the kvm command.
• SCRIPT: name of a shell script to be executed after creating the tun device for the VM. It corresponds to the script option of the ‘-net’ argument of the kvm command.
• MODEL: ethernet hardware to emulate. You can get the list of available models with this command:
$ kvm -net nic,model = ? -nographic /dev/null
• FILTER to define a network filtering rule for the interface. Libvirt includes some predefined rules (e.g. cleantraffic) that can be used.
Check the Libvirt documentation for more information, you can also list the rules in your system with:
$ virsh -c qemu:///system nwfilter-list
Graphics
If properly configured, libvirt and KVM can work with SPICE ( check this for more information ). To select it, just add to the GRAPHICS attribute:
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• TYPE = SPICE
Enabling spice will also make the driver inject specific configuration for these machines. The configuration can be changed in the driver configuration file, variable SPICE_OPTIONS.
Virtio
Virtio is the framework for IO virtualization in KVM. You will need a linux kernel with the virtio drivers for the guest, check the KVM documentation for more info .
If you want to use the virtio drivers add the following attributes to your devices:
• DISK, add the attribute DEV_PREFIX="vd"
• NIC, add the attribute MODE="virtio"
Additional Attributes
The raw attribute offers the end user the possibility of passing by attributes not known by OpenNebula to KVM.
Basically, everything placed here will be written literally into the KVM deployment file (use libvirt xml format and semantics).
RAW = [ type = "kvm" , data = "<devices><serial type=\"pty\"><source path=\"/dev/pts/5\"/><target
˓→ port=\"0\"/></serial><console type=\"pty\" tty=\"/dev/pts/5\"><source path=\"/dev/
˓→ pts/5\"/><target port=\"0\"/></console></devices>" ]
Disk/Nic Hotplugging
KVM supports hotplugging to the virtio and the SCSI buses. For disks, the bus the disk will be attached to is inferred from the DEV_PREFIX attribute of the disk template.
• vd: virtio (recommended).
• sd: SCSI (default).
If TARGET is passed instead of DEV_PREFIX the same rules apply (what happens behind the scenes is that Open-
Nebula generates a TARGET based on the DEV_PREFIX if no TARGET is provided).
The configuration for the default cache type on newly attached disks is configured in /var/lib/one/remotes/ vmm/kvm/kvmrc :
# This parameter will set the default cache type for new attached disks. It
# will be used in case the attached disk does not have an specific cache
# method set (can be set using templates when attaching a disk).
DEFAULT_ATTACH_CACHE = none
For Disks and NICs, if the guest OS is a Linux flavor, the guest needs to be explicitly tell to rescan the PCI bus. This can be done issuing the following command as root:
# echo 1 > /sys/bus/pci/rescan
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Enabling QEMU Guest Agent
QEMU Guest Agent allows the communication of some actions with the guest OS. This agent uses a virtio serial connection to send and receive commands. One of the interesting actions is that it allows to freeze the filesystem before doing an snapshot. This way the snapshot won’t contain half written data. Filesystem freeze will only be used with CEPH and qcow2 storage drivers.
The agent package needed in the Guest OS is available in most distributions. Is called qemu-guest-agent in most of them. If you need more information you can follow these links:
• https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Virtualization_
Deployment_and_Administration_Guide/chap-QEMU_Guest_Agent.html
• http://wiki.libvirt.org/page/Qemu_guest_agent
• http://wiki.qemu.org/Features/QAPI/GuestAgent
To enable the communication channel with the guest agent this line must be present in /etc/one/vmm_exec/ vmm_exec_kvm.conf
:
RAW = "<devices><channel type='unix'><source mode='bind'/><target type='virtio' name=
˓→
'org.qemu.guest_agent.0'/></channel></devices>"
Importing VMs
VMs running on KVM hypervisors that were not launched through OpenNebula can be imported in OpenNebula.
It is important to highlight that, besides the limitations explained in the host guide, the “Poweroff” operation is not available for these imported VMs in KVM.
7.2.5 Tuning & Extending
Multiple Actions per Host
Warning: This feature is experimental. Some modifications to the code must be done before this is a recommended setup.
By default the drivers use a unix socket to communicate with the libvirt daemon. This method can only be safely used by one process at a time. To make sure this happens the drivers are configured to send only one action per host at a time. For example, there will be only one deployment done per host at a given time.
This limitation can be solved configuring libvirt to accept TCP connections and OpenNebula to use this communication method.
Libvirt configuration
Here is described how to configure libvirtd to accept unencrypted and unauthenticated TCP connections in a CentOS
7 machine. For other setup check your distribution and libvirt documentation.
Change the file /etc/libvirt/libvirtd.conf in each of the hypervisors and make sure that these parameters are set and have the following values:
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listen_tls = 0 listen_tcp = 1 tcp_port = "16509" auth_tcp = "none"
You will also need to modify /etc/sysconfig/libvirtd and uncomment this line:
LIBVIRTD_ARGS = "--listen"
After modifying these files the libvirt daemon must be restarted:
$ sudo systemctl restart libvirtd
OpenNebula configuration
The VMM driver must be configured so it allows more than one action to be executed per host. This can be done adding the parameter -p to the driver executable. This is done in /etc/one/oned.conf in the VM_MAD configuration section:
VM_MAD = [ name = "kvm" , executable = "one_vmm_exec" , arguments = "-t 15 -r 0 kvm -p" , default type
= "vmm_exec/vmm_exec_kvm.conf" ,
= "kvm" ]
Change the file /var/lib/one/remotes/vmm/kvm/kvmrc so set a TCP endpoint for libvirt communication: export LIBVIRT_URI = qemu + tcp: // localhost / system
The scheduler configuration should also be changed to let it deploy more than one VM per host. The file is located at
/etc/one/sched.conf
and the value to change is MAX_HOST For example, to let the scheduler submit 10 VMs per host use this line:
MAX_HOST = 10
After this update the remote files in the nodes and restart opennebula:
$ onehost sync --force
$ sudo systemctl restart opennebula
Files and Parameters
The driver consists of the following files:
• /usr/lib/one/mads/one_vmm_exec : generic VMM driver.
• /var/lib/one/remotes/vmm/kvm : commands executed to perform actions.
And the following driver configuration files:
• /etc/one/vmm_exec/vmm_exec_kvm.conf : This file is home for default values for domain definitions
(in other words, OpenNebula templates).
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It is generally a good idea to place defaults for the KVM-specific attributes, that is, attributes mandatory in the KVM driver that are not mandatory for other hypervisors. Non mandatory attributes for KVM but specific to them are also recommended to have a default.
• /var/lib/one/remotes/vmm/kvm/kvmrc : This file holds instructions to be executed before the actual driver load to perform specific tasks or to pass environmental variables to the driver. The syntax used for the former is plain shell script that will be evaluated before the driver execution. For the latter, the syntax is the familiar:
ENVIRONMENT_VARIABLE = VALUE
The parameters that can be changed here are as follows:
Parameter Description
LIBVIRT_URI Connection string to libvirtd attached disk does not have an specific cache method set (can be set using templates when attaching a disk).
See the Virtual Machine drivers reference for more information.
7.2.6 Troubleshooting image magic is incorrect
When trying to restore the VM from a suspended state this error is returned: libvirtd1021: operation failed: image magic is incorrect
It can be fixed by applying: options kvm_intel nested = 0 options kvm_intel emulate_invalid_guest_state = 0 options kvm ignore_msrs = 1
7.3 Monitoring
This section provides an overview of the OpenNebula monitoring subsystem. The monitoring subsystem gathers information relative to the Hosts and the Virtual Machines, such as the Host status, basic performance indicators, as well as Virtual Machine status and capacity consumption. This information is collected by executing a set of static probes provided by OpenNebula. The output of these probes is sent to OpenNebula using a push mechanism.
7.3.1 Overview
Each host periodically sends monitoring data via UDP to the Frontend which collects it and processes it in a dedicated module. This distributed monitoring system resembles the architecture of dedicated monitoring systems, using a lightweight communication protocol, and a push model.
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OpenNebula starts a collectd daemon running in the Front-end that listens for UDP connections on port 4124. In the first monitoring cycle the OpenNebula connects to the host using ssh and starts a daemon that will execute the probe scripts and sends the collected data to the collectd daemon in the Frontend every specific amount of seconds
(configurable with the -i option of the collectd IM_MAD). This way the monitoring subsystem doesn’t need to make new ssh connections to receive data.
If the agent stops in a specific Host, OpenNebula will detect that no monitorization data is received from that hosts and will restart the probe with SSH.
7.3.2 Requirements
• The firewall of the Frontend (if enabled) must allow UDP packages incoming from the hosts on port 4124.
7.3.3 OpenNebula Configuration
Enabling the Drivers
To enable this monitoring system /etc/one/oned.conf must be configured with the following snippets: collectd must be enabled both for KVM:
#
#
#
#
#-------------------------------------------------------------------------------
# Information Collector for KVM IM's.
#-------------------------------------------------------------------------------
# This driver CANNOT BE ASSIGNED TO A HOST, and needs to be used with KVM
# -h prints this help.
# -a Address to bind the collectd sockect (defults 0.0.0.0)
-p UDP port to listen for monitor information (default 4124)
-f Interval in seconds to flush collected information (default 5)
-t Number of threads for the server (defult 50)
-i Time in seconds of the monitorization push cycle. This parameter must
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# be smaller than MONITORING_INTERVAL, otherwise push monitorization will
# not be effective.
#-------------------------------------------------------------------------------
IM_MAD = [
NAME = "collectd" ,
EXECUTABLE = "collectd" ,
ARGUMENTS = "-p 4124 -f 5 -t 50 -i 20" ]
#-------------------------------------------------------------------------------
Valid arguments for this driver are:
• -a: Address to bind the collectd socket (defaults 0.0.0.0)
• -p: port number
• -f: Interval in seconds to flush collected information to OpenNebula (default 5)
• -t: Number of threads for the collectd server (defult 50)
• -i: Time in seconds of the monitorization push cycle. This parameter must be smaller than MONITOR-
ING_INTERVAL (see below), otherwise push monitorization will not be effective.
KVM:
#-------------------------------------------------------------------------------
# KVM UDP-push Information Driver Manager Configuration
# -r number of retries when monitoring a host
# -t number of threads, i.e. number of hosts monitored at the same time
#-------------------------------------------------------------------------------
IM_MAD = [
NAME = "kvm" ,
SUNSTONE_NAME = "KVM" ,
EXECUTABLE = "one_im_ssh" ,
ARGUMENTS = "-r 3 -t 15 kvm" ]
#-------------------------------------------------------------------------------
The arguments passed to this driver are:
• -r: number of retries when monitoring a host
• -t: number of threads, i.e. number of hosts monitored at the same time
Monitoring Configuration Parameters
OpenNebula allows to customize the general behavior of the whole monitoring subsystem:
Parameter
MONITOR-
Description
Time in seconds between host and VM monitorization. It must have a value greater
ING_INTERVAL than the manager timer
HOST_PER_INTERVAL Number of hosts monitored in each interval.
7.3.4 Troubleshooting
Healthy Monitoring System
Every (approximately) monitoring_push_cycle of seconds OpenNebula is receiving the monitoring data of every Virtual Machine and of a host like such:
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Tue May 24 16 : 21 : 47 2016 [Z0][InM][D]: Host thost087 ( 0 ) successfully monitored .
Tue May 24 16 : 21 : 47 2016 [Z0][VMM][D]: VM 0 successfully monitored: STATE = a CPU = 0.0
˓→
MEMORY = 113404 NETRX = 648 NETTX = 398
Tue May 24 16 : 22 : 07 2016 [Z0][InM][D]: Host thost087 ( 0 ) successfully monitored .
Tue May 24 16 : 22 : 07 2016 [Z0][VMM][D]: VM 0 successfully monitored: STATE = a CPU = 0.0
˓→
MEMORY = 113516 NETRX = 648 NETTX = 468
Tue May 24 16 : 22 : 11 2016 [Z0][VMM][D]: VM 0 successfully monitored: DISK_SIZE = [ID = 0 ,
˓→
SIZE = 27 ] DISK_SIZE = [ID = 1 ,SIZE = 1 ]
Tue May 24 16 : 22 : 27 2016 [Z0][InM][D]: Host thost087 ( 0 ) successfully monitored .
Tue May 24 16 : 22 : 27 2016 [Z0][VMM][D]: VM 0 successfully monitored: STATE = a CPU = 0.0
˓→
MEMORY = 113544 NETRX = 648 NETTX = 468
However, if in oned.log a host is being monitored actively periodically (every MONITORING_INTERVAL seconds) then the monitorization is not working correctly:
Tue May 24 16 : 24 : 23 2016 [Z0][InM][D]: Monitoring host thost087 ( 0 )
Tue May 24 16 : 25 : 23 2016 [Z0][InM][D]: Monitoring host thost087 ( 0 )
Tue May 24 16 : 26 : 23 2016 [Z0][InM][D]: Monitoring host thost087 ( 0 )
If this is the case it’s probably because OpenNebula is receiving probes faster than it can process. See the Tuning section to fix this.
Monitoring Probes
For the troubleshooting of errors produced during the execution of the monitoring probes, please refer to the
section.
7.3.5 Tuning & Extending
Adjust Monitoring Interval Times
In order to tune your OpenNebula installation with appropriate values of the monitoring parameters you need to adjust the -i option of the collectd IM_MAD (the monitoring push cycle).
If the system is not working healthily it will be due to the database throughput since OpenNebula will write the monitoring information to a database, an amount of ~4KB per VM. If the number of virtual machines is too large and the monitoring push cycle too low, OpenNebula will not be able to write that amount of data to the database.
Driver Files
The probes are specialized programs that obtain the monitor metrics. Probes are defined for each hypervisor, and are located at /var/lib/one/remotes/im/kvm-probes.d for KVM.
You can easily write your own probes or modify existing ones, please see the Information Manager Drivers guide.
Remember to synchronize the monitor probes in the hosts using onehost sync as described in the Managing
Hosts guide.
7.4 PCI Passthrough
It is possible to discover PCI devices in the Hosts and assign them to Virtual Machines for the KVM hypervisor.
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The setup and environment information is taken from here . You can safely ignore all the VGA related sections, for
PCI devices that are not graphic cards, or if you don’t want to output video signal from them.
Warning: The overall setup state was extracted from a preconfigured Fedora 22 machine. Configuration for your distro may be different.
7.4.1 Requirements
• The host that is going to be used for virtualization needs to support I/O MMU . For Intel processors this is called
VT-d and for AMD processors is called AMD-Vi. The instructions are made for Intel branded processors but the process should be very similar for AMD.
• kernel >= 3.12
7.4.2 Machine Configuration (Hypervisor)
Kernel Configuration
The kernel must be configured to support I/O MMU and to blacklist any driver that could be accessing the PCI’s that we want to use in our VMs. The parameter to enable I/O MMU is: intel_iommu = on
We also need to tell the kernel to load the vfio-pci driver and blacklist the drivers for the selected cards. For example, for nvidia GPUs we can use these parameters: rd .
driver .
pre = vfio pci rd .
driver .
blacklist = nouveau
Loading vfio Driver in initrd
The modules for vfio must be added to initrd. The list of modules are vfio vfio_iommu_type1 vfio_pci vfio_virqfd
. For example, if your system uses dracut add the file /etc/dracut.conf.d/local.conf
with this line: add_drivers += "vfio vfio_iommu_type1 vfio_pci vfio_virqfd" and regenerate initrd:
# dracut --force
Driver Blacklisting
The same blacklisting done in the kernel parameters must be done in the system configuration. /etc/modprobe.
d/blacklist.conf
for nvidia GPUs: blacklist nouveau blacklist lbm nouveau options nouveau modeset = 0 alias nouveau off alias lbm nouveau off
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Alongside this configuration vfio driver should be loaded passing the id of the PCI cards we want to attach to VMs.
For example, for nvidia Grid K2 GPU we pass the id 10de:11bf. File /etc/modprobe.d/local.conf: options vfio pci ids = 10 de: 11 bf
vfio Device Binding
I/O MMU separates PCI cards into groups to isolate memory operation between devices and VMs. To add the cards to vfio and assign a group to them we can use the scripts shared in the aforementioned web page .
This script binds a card to vfio. It goes into /usr/local/bin/vfio-bind:
#!/bin/sh modprobe vfio-pci for dev in "$@"; do vendor=$(cat /sys/bus/pci/devices/$dev/vendor) device=$(cat /sys/bus/pci/devices/$dev/device) if [ -e /sys/bus/pci/devices/\$dev/driver ]; then echo $dev > /sys/bus/pci/devices/$dev/driver/unbind fi echo $vendor $device > /sys/bus/pci/drivers/vfio-pci/new_id done
The configuration goes into /etc/sysconfig/vfio-bind. The cards are specified with PCI addresses. Addresses can be retrieved with lspci command. Make sure to prepend the domain that is usually 0000. For example:
DEVICES = "0000:04:00.0 0000:05:00.0 0000:84:00.0 0000:85:00.0"
Here is a systemd script that executes the script. It can be written to /etc/systemd/system/vfio-bind.
service and enabled:
[Unit]
Description=Binds devices to vfio-pci
After=syslog.target
[Service]
EnvironmentFile=-/etc/sysconfig/vfio-bind
Type=oneshot
RemainAfterExit=yes
ExecStart=-/usr/local/bin/vfio-bind $DEVICES
[Install]
WantedBy=multi-user.target
qemu Configuration
Now we need to give qemu access to the vfio devices for the groups assigned to the PCI cards. We can get a list of PCI cards and its I/O MMU group using this command:
# find /sys/kernel/iommu_groups/ -type l
In our example our cards have the groups 45, 46, 58 and 59 so we add this configuration to /etc/libvirt/qemu.
conf
:
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cgroup_device_acl = [
"/dev/null" , "/dev/full" , "/dev/zero" ,
"/dev/random" , "/dev/urandom" ,
"/dev/ptmx" , "/dev/kvm" , "/dev/kqemu" ,
"/dev/rtc" , "/dev/hpet" , "/dev/vfio/vfio" ,
"/dev/vfio/45" , "/dev/vfio/46" , "/dev/vfio/58" ,
"/dev/vfio/59"
]
7.4.3 Driver Configuration
The only configuration that is needed is the filter for the monitoring probe that gets the list of PCI cards. By default the probe lists all the cards available in a host. To narrow the list a filter configuration can be changed in /var/lib/ one/remotes/im/kvm-probes.d/pci.rb
and set a list with the same format as lspci:
# This variable contains the filters for PCI card monitoring. The format
# is the same as lspci and several filters can be added separated by commas.
# A nil filter will retrieve all PCI cards.
#
# From lspci help:
#
#
-d [<vendor>]:[<device>][:<class>]
# For example
#
# FILTER = '::0300' # all VGA cards
# FILTER = '10de::0300' # all NVIDIA VGA cards
# FILTER = '10de:11bf:0300' # only GK104GL [GRID K2]
# FILTER = '8086::0300,::0106' # all Intel VGA cards and any SATA controller
7.4.4 Usage
The basic workflow is to inspect the host information, either in the CLI or in Sunstone, to find out the available PCI devices, and to add the desired device to the template. PCI devices can be added by specifying VENDOR, DEVICE and CLASS, or simply CLASS. Note that OpenNebula will only deploy the VM in a host with the available PCI device. If no hosts match, an error message will appear in the Scheduler log.
CLI
A new table in onehost show command gives us the list of PCI devices per host. For example:
PCI DEVICES
VM ADDR TYPE NAME
00 : 00.0 8086 : 0 a04: 0600 Haswell ULT DRAM Controller
00 : 02.0 8086 : 0 a16: 0300 Haswell ULT Integrated Graphics Controller
123 00 : 03.0 8086 : 0 a0c: 0403 Haswell ULT HD Audio Controller
00 : 14.0 8086 : 9 c31: 0 c03 8 Series USB xHCI HC
00 : 16.0 8086 : 9 c3a: 0780 8 Series HECI #0
00 : 1 b .
0 8086 : 9 c20: 0403 8 Series HD Audio Controller
00 : 1 c .
0 8086 : 9 c10: 0604 8 Series PCI Express Root Port 1
00 : 1 c .
2 8086 : 9 c14: 0604 8 Series PCI Express Root Port 3
00 : 1 d .
0 8086 : 9 c26: 0 c03 8 Series USB EHCI #1
00 : 1 f .
0 8086 : 9 c43: 0601 8 Series LPC Controller
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00 : 1 f .
2 8086 : 9 c03: 0106 8 Series SATA Controller 1 [AHCI mode]
00 : 1 f .
3 8086 : 9 c22: 0 c05 8 Series SMBus Controller
02 : 00.0 8086 : 08 b1: 0280 Wireless 7260
• VM: The VM ID using that specific device. Empty if no VMs are using that device.
• ADDR: PCI Address.
• TYPE: Values describing the device. These are VENDOR:DEVICE:CLASS. These values are used when selecting a PCI device do to passthrough.
• NAME: Name of the PCI device.
To make use of one of the PCI devices in a VM a new option can be added selecting which device to use. For example this will ask for a Haswell-ULT HD Audio Controller:
PCI = [
VENDOR = "8086" ,
DEVICE = "0a0c" ,
CLASS = "0403"
]
The device can be also specified without all the type values. For example, to get any PCI Express Root Ports this can be added to a VM tmplate:
PCI = [
CLASS = "0604"
]
More than one PCI options can be added to attach more than one PCI device to the VM.
Sunstone
In Sunstone the information is displayed in the PCI tab:
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7.4.5 Usage as Network Interfaces
It is possible use a PCI device as a NIC interface directly in OpenNebula. In order to do so you will need to follow the configuration steps mentioned in this guide, namely changing the device driver.
When defining a Network that will be used for PCI passthrough nics, please use either the dummy network driver or the 802.1Q if you are using VLAN. In any case, type any random value into the BRIDGE field, and it will be ignored.
For 802.1Q you can also leave PHYDEV blank.
The context packages support the configuration of the following attributes:
• MAC: It will change the mac address of the corresponding network interface to the MAC assigned by OpenNebula.
• IP: It will assign an IPv4 address to the interface, assuming a /24 netmask.
• IPV6: It will assign an IPv6 address to the interface, assuming a /128 netmask.
• VLAN_ID: If present, it will create a tagged interface and assign the IPs to the tagged interface.
CLI
When a PCI in a template contains the attribute TYPE="NIC", it will be treated as a NIC and OpenNebula will assign a MAC address, a VLAN_ID, an IP, etc, to the PCI device.
This is an example of the PCI section of an interface that will be treated as a NIC:
PCI = [
NETWORK = "passthrough" ,
NETWORK_UNAME = "oneadmin" ,
TYPE = "NIC" ,
CLASS = "0200" ,
DEVICE = "10d3" ,
VENDOR = "8086" ]
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Note that the order of appearence of the PCI elements and NIC elements in the template is relevant. The will be mapped to nics in the order they appear, regardless if they’re NICs of PCIs.
Sunstone
In the Network tab, under advanced options check the PCI Passthrough option and fill in the PCI address. Use the rest of the dialog as usual by selecting a network from the table.
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CHAPTER
EIGHT
OPEN CLOUD STORAGE SETUP
8.1 Overview
8.1.1 Datastore Types
OpenNebula storage is structured around the Datastore concept. A Datastore is any storage medium to store disk images. OpenNebula features three different datastore types:
• The Images Datastore, stores the images repository.
• The System Datastore holds disk for running virtual machines. Disk are moved, or cloned to/from the Images datastore when the VMs are deployed or terminated; or when disks are attached or snapshotted.
• The Files & Kernels Datastore to store plain files and not disk images. The plain files can be used as kernels, ram-disks or context files.
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Image Datastores
There are different Image Datastores depending on how the images are stored on the underlying storage technology:
•
Filesystem , to store images in a file form.
•
LVM , to store images in LVM logical volumes.
•
Ceph , to store images using Ceph block devices.
•
Raw Device Mapping , to direct attach to the virtual machine existing block devices in the nodes.
•
iSCSI - Libvirt Datastore , to access iSCSI devices through the buil-in qemu support.
Disk images are transferred between the Image and System datastores by the transfer manager (TM) drivers. These drivers are specialized pieces of software that perform low-level storage operations. The following table summarizes the available transfer modes for each datastore:
Datastore
Filesystem
Image to System Datastore disk transfers methods
• shared, images are exported in a shared filesystem
• ssh, images are copied using the ssh protocol
• qcow2, like shared but specialized for the qcow2 format
Ceph
• ceph, all images are exported in Ceph pools
• shared, volatile & context disks exported in a shared FS.
LVM
• fs_lvm, images exported in a shared FS but dumped to a LV
Raw Devices
• dev, images are existing block devices in the nodes iSCSI libvirt
• iscsi, images are iSCSI targets
8.1.2 How Should I Read This Chapter
Before reading this chapter make sure you have read the
chapter. After that, proceed to the specific section for the Datastores you may be interested in.
After reading this chapter you should read the
chapter.
8.1.3 Hypervisor Compatibility
This chapter applies only to KVM.
Follow the
section for a similar guide for vCenter.
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8.2 Filesystem Datastore
The Filesystem Datastore lets you store VM images in a file form. The use of file-based disk images presents several benefits over device backed disks (e.g. easily backup images, or use of shared FS) although it may less performing in some cases.
Usually it is a good idea to have multiple filesystem datastores to:
• Balancing I/O operations between storage servers
• Use different datastores for different cluster hosts
• Apply different transfer modes to different images
• Different SLA policies (e.g. backup) can be applied to different VM types or users
• Easily add new storage to the cloud
The Filesystem datastore can be used with three different transfer modes, described below:
• shared, images are exported in a shared filesystem
• ssh, images are copied using the ssh protocol
• qcow2, like shared but specialized for the qcow2 format
8.2.1 Datastore Layout
Images are saved into the corresponding datastore directory (/var/lib/one/datastores/<DATASTORE
ID>
). Also, for each running virtual machine there is a directory (named after the VM ID) in the corresponding
System Datastore. These directories contain the VM disks and additional files, e.g. checkpoint or snapshots.
For example, a system with an Image Datastore (1) with three images and 3 Virtual Machines (VM 0 and 2 running, and VM 7 stopped) running from System Datastore 0 would present the following layout:
/var/lib/one/datastores
|-- 0/
| |-- 0/
| | |-- disk.0
| | `-- disk.1
| |-- 2/
| | `-- disk.0
| `-- 7/
| |-- checkpoint
|
`-- 1
`-- disk.0
|-- 05a38ae85311b9dbb4eb15a2010f11ce
|-- 2bbec245b382fd833be35b0b0683ed09
`-- d0e0df1fb8cfa88311ea54dfbcfc4b0c
Note:
The canonical path for /var/lib/one/datastores can be changed in oned.conf with the
DATASTORE_LOCATION configuration attribute
Shared & Qcow2 Transfer Modes
The shared transfer driver assumes that the datastore is mounted in all the hosts of the cluster. Typically this is achieved through a distributed FS like NFS, GlusterFS or Lustre.
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When a VM is created, its disks (the disk.i files) are copied or linked in the corresponding directory of the system datastore. These file operations are always performed remotely on the target host.
This transfer mode usually reduces VM deployment times and enables live-migration, but it can also become a bottleneck in your infrastructure and degrade your Virtual Machines performance if the virtualized services perform disk-intensive workloads. Usually this limitation may be overcome by:
• Using different file-system servers for the images datastores, so the actual I/O bandwidth is balanced
• Using an ssh System Datastore instead, the images are copied locally to each host
• Tuning or improving the file-system servers
SSH Transfer Mode
In this case the System Datastore is distributed among the hosts. The ssh transfer driver uses the hosts’ local storage to place the images of running Virtual Machines. All the operations are then performed locally but images have to be copied always to the hosts, which in turn can be a very resource demanding operation. Also this driver prevents the use of live-migrations between hosts.
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8.2.2 Frontend Setup
The Frontend needs to prepare the storage area for:
• The Image Datastores, to store the images.
• The System Datastores, will hold temporary disks and files for VMs stopped and undeployed.
Shared & Qcow2 Transfer Modes
Simply mount the Image Datastore directory in the front-end in
/var/lib/one/datastores/
<datastore_id>
.
Note that if all the datastores are of the same type you can mount the whole /var/ lib/one/datastores directory.
Warning: The frontend only needs to mount the Image Datastores and not the System Datastores.
Note: NFS volumes mount tips. The following options are recomended to mount a NFS shares:soft, intr, rsize=32768, wsize=32768 . With the documented configuration of libvirt/kvm the image files are accessed as oneadmin user. In case the files must be read by root the option no_root_squash must be added.
SSH Transfer Mode
Simply make sure that there is enough space under /var/lib/one/datastores to store Images and the disks of the stopped and undeployed virtual machines. Note that /var/lib/one/datastores can be mounted from any NAS/SAN server in your network.
8.2.3 Node Setup
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Shared & Qcow2 Transfer Modes
The configuration is the same as for the Frontend above, simply mount in each node the datastore directories in
/var/lib/one/datastores/<datastore_id>
.
SSH Transfer Mode
Just make sure that there is enough space under /var/lib/one/datastores to store the disks of running VMs on that host.
Warning:
Make sure all the hosts, including the frontend, can ssh to any other host (including themselves).
Otherwise migrations will not work.
8.2.4 OpenNebula Configuration
Once the Filesystem storage is setup, the OpenNebula configuration comprises two steps:
• Create a System Datastore
• Create an Image Datastore
Create a System Datastore
To create a new System Datastore you need to specify its type as system datastore and transfer mode:
Attribute
NAME
TYPE
TM_MAD
Description
The name of the datastore
SYSTEM_DS shared for shared transfer mode qcow2 for qcow2 transfer mode ssh for ssh transfer mode
This can be done either in Sunstone or through the CLI, for example to create a System Datastore using the shared mode simply:
$ cat systemds.txt
NAME = nfs_system
TM_MAD = shared
TYPE = SYSTEM_DS
$ onedatastore create systemds.txt
ID: 101
Create an Image Datastore
In the same way, to create an Image Datastore you need to set:
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Attribute
NAME
DS_MAD
TM_MAD
Description
The name of the datastore fs shared for shared transfer mode qcow2 for qcow2 transfer mode ssh for ssh transfer mode
For example, the following illustrates the creation of a filesystem datastore using the shared transfer drivers.
$ cat ds.conf
NAME = nfs_images
DS_MAD = fs
TM_MAD = shared
$ onedatastore create ds.conf
ID: 100
Also note that there are additional attributes that can be set, check the datastore template attributes.
Warning: Be sure to use the same TM_MAD for both the System and Image datastore.
Addtional Configuration
The qcow2 drivers are a specialization of the shared drivers to work with the qcow2 format for disk images. Images are created and through the qemu-img command using the original image as backing file. Custom options can be sent to qemu-img clone action through the variable QCOW2_OPTIONS in /var/lib/one/remotes/tm/tmrc.
8.3 Ceph Datastore
The Ceph datastore driver provides OpenNebula users with the possibility of using Ceph block devices as their Virtual
Images.
Warning: This driver requires that the OpenNebula nodes using the Ceph driver must be Ceph clients of a running
Ceph cluster. More information in Ceph documentation .
8.3.1 Datastore Layout
Images and virtual machine disks are stored in the same Ceph pool. Each Image is named one-<IMAGE ID> in the pool. Virtual machines will use these rbd volumes for its disks if the Images are persistent, otherwise new snapshots are created in the form one-<IMAGE ID>-<VM ID>-<DISK ID>.
For example, consider a system using an Image and System Datastore backed by a Ceph pool named one. The pool with one Image (ID 0) and two Virtual Machines 14 and 15 using this Image as virtual disk 0 would be similar to:
$ rbd ls -l -p one --id libvirt
NAME one-0
SIZE PARENT
10240M
FMT PROT LOCK
2 one-0@snap 10240M 2 yes one-0-14-0 10240M one/one-0@snap 2 one-0-15-0 10240M one/one-0@snap 2
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Note: In this case context disk and auxiliar files (deployment description and chekpoints) are stored locally in the nodes.
8.3.2 Ceph Cluster Setup
This guide assumes that you already have a functional Ceph cluster in place. Additionally you need to:
• Create a pool for the OpenNebula datastores. Write down the name of the pool to include it in the datastore definitions.
$ ceph osd pool create one 128
$ ceph osd lspools
0 data,1 metadata,2 rbd,6 one,
• Define a Ceph user to access the datastore pool, this user will be also used by libvirt to access the disk images.
Also, get a copy of the key of this user to distribute it later to the OpenNebula nodes. For example, create a user libvirt
:
$ ceph auth get-or-create client.libvirt mon 'allow r' osd
\
'allow class-read object_prefix rbd_children, allow rwx pool=one'
$ ceph auth get-key client.libvirt | tee client.libvirt.key
$ ceph auth get client.libvirt -o ceph.client.libvirt.keyring
• Altough RDB format 1 is supported it is strongly recommended to use Format 2. Check that ceph.conf
includes:
[
global
] rbd_default_format = 2
• Pick a set of client nodes of the cluster to act as storage bridges. These nodes will be used to import images into the Ceph Cluster from OpenNebula. These nodes must have qemu-img command installed.
Note: For production environments it is recommended to not co-allocate ceph services (monitor, osds) with Open-
Nebula nodes or front-end
8.3.3 Frontend Setup
The Frontend does not need any specific Ceph setup, it will access the Ceph cluster through the storage bridges.
8.3.4 Node Setup
In order to use the Ceph cluster the nodes needs to be configured as follows:
• The ceph client tools must be available in the node
• The mon daemon must be defined in the ceph.conf for all the nodes, so hostname and port doesn’t need to be specified explicitly in any Ceph command.
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• Copy the Ceph user keyring (ceph.client.libvirt.keyring) to the nodes under /etc/ceph, and the user key (client.libvirt.key) to the oneadmin home.
$ scp ceph.client.libvirt.keyring root@node:/etc/ceph
$ scp client.libvirt.key oneadmin@node:
• Generate a secret for the Ceph user and copy it to the nodes under oneadmin home. Write down the UUID for later use.
$ UUID = ` uuidgen ` ; echo $UUID c7bdeabf-5f2a-4094-9413-58c6a9590980
$ cat > secret.xml
<<EOF
<secret ephemeral='no' private='no'>
<uuid>$UUID</uuid>
<usage type='ceph'>
<name>client.libvirt secret</name>
</usage>
</secret>
EOF
$ scp secret.xml oneadmin@node:
• Define the a libvirt secret and remove key files in the nodes:
$ virsh -c qemu:///system secret-define secret.xml
$ virsh -c qemu:///system secret-set-value --secret $UUID --base64
$(
cat client.
˓→ libvirt.key
)
$ rm client.libvirt.key
• The oneadmin account needs to access the Ceph Cluster using the libvirt Ceph user defined above. This requires access to the ceph user keyring. Test that Ceph client is properly configured in the node.
$ ssh oneadmin@node
$ rbd ls -p one --id libvirt
You can read more information about this in the Ceph guide Using libvirt with Ceph .
• Ancillary virtual machine files like context disks, deployment and checkpoint files are created at the nodes under
/var/lib/one/datastores/
, make sure that enough storage for these files is provisioned in the nodes.
8.3.5 OpenNebula Configuration
To use your Ceph cluster with OpenNebula you need to define a System and Image datastores. Both datastores will share the same configuration parameters and Ceph pool.
Note: You may add addtional Image and System Datastores pointing to other pools with diffirent allocation/replication policies in Ceph.
Each Image/System Datastore pair needs to define the same following attributes:
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Attribute
POOL_NAME
CEPH_USER
TM_MAD
Description
The Ceph pool name
Mandatory
YES
The Ceph user name, used by libvirt and rbd commands.
YES ceph
YES
CEPH_CONF
Non default ceph configuration file if needed.
RBD_FORMAT By default RBD Format 2 will be used.
NO
NO
Create a System Datastore
Create a System Datastore in Sunstone or through the CLI, for example:
$ cat systemds.txt
NAME = ceph_system
TM_MAD = ceph
TYPE = SYSTEM_DS
POOL_NAME = one
CEPH_USER = libvirt
$ onedatastore create systemds.txt
ID: 101
Note: Ceph can also work with a System Datastore of type Filesystem in a shared transfer mode, as described
Note that apart from the Ceph Cluster you need to setup a shared FS.
Create an Image Datastore
Apart from the previous attributes, that need to be the same as the associated System Datastore, the following can be set for an Image Datastore:
Attribute Description
DS_MAD ceph
DISK_TYPE RBD
BRIDGE_LIST
List of storage bridges to access the Ceph cluster
CEPH_HOST
Space-separated list of Ceph monitors. Example: host1 host2:port2 host3 host4:port4
.
CEPH_SECRET
The UUID of the libvirt secret.
STAGING_DIR
Default path for image operations in the bridges
Mandatory
YES
YES
YES
YES
YES
NO
An example of datastore:
> cat ds .
conf
NAME = "cephds"
DS_MAD = ceph
TM_MAD = ceph
DISK_TYPE = RBD
POOL_NAME = one
CEPH_HOST = host1 host2:port2
CEPH_USER = libvirt
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CEPH_SECRET = "6f88b54b-5dae-41fe-a43e-b2763f601cfc"
BRIDGE_LIST = cephfrontend
> onedatastore create ds .
conf
ID: 101
Addtional Configuration
Default values for the Ceph drivers can be set in /var/lib/one/remotes/datastore/ceph/ceph.conf:
• POOL_NAME: Default volume group
• STAGING_DIR: Default path for image operations in the storage bridges
• RBD_FORMAT: Default format for RBD volumes.
8.4 LVM Datastore
The LVM datastore driver provides OpenNebula with the possibility of using LVM volumes instead of plain files to hold the Virtual Images. This reduces the overhead of having a file-system in place and thus it may increase I/O performance.
8.4.1 Datastore Layout
Images are stored as regular files (under the usual path: /var/lib/one/datastores/<id>) in the Image Datastore, but they will be dumped into a Logical Volumes (LV) upon virtual machine creation. The virtual machines will run from Logical Volumes in the node.
This is the recommended driver to be used when a high-end SAN is available. The same LUN can be exported to all the hosts, Virtual Machines will be able to run directly from the SAN.
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Note: The LVM datastore does not need CLVM configured in your cluster. The drivers refresh LVM meta-data each time an image is needed in another host.
For example, consider a system with two Virtual Machines (9 and 10) using a disk, running in a LVM Datastore, with
ID 0. The nodes have configured a shared LUN and created a volume group named vg-one-0, the layout of the datastore would be:
# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move lv-one-10-0 vg-one-0 -wi------- 2.20g
lv-one-9-0 vg-one-0 -wi------- 2.20g
Warning: Images are stored in a shared storage in file form (e.g. NFS, GlusterFS...) the datastore directories and mount points needs to be configured as a regular shared image datastore,
System datastore with the LVM one, as described below.
8.4.2 Frontend Setup
No additional configuration is needed.
8.4.3 Node Setup
Nodes needs to meet the following requirements:
• LVM2 must be available in the Hosts.
• lvmetad must be disabled. Set this parameter in /etc/lvm/lvm.conf: use_lvmetad = 0, and disable the lvm2-lvmetad.service if running.
• oneadmin needs to belong to the disk group.
• All the nodes needs to have access to the same LUNs.
• A LVM VG needs to be created in the shared LUNs for each datastore following name: vg-one-<system_ds_id> . This just need to be done in one node.
• Virtual Machine disks are symbolic links to the block devices. However, additional VM files like checkpoints or deployment files are stored under /var/lib/one/datastores/<id>. Be sure that enough local space is present.
• All the nodes needs to have access to the image datastore, mounting the asociated directory.
8.4.4 OpenNebula Configuration
Once the storage is setup, the OpenNebula configuration comprises two steps:
• Create a System Datastore
• Create an Image Datastore
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Create a System Datastore
LVM System Datastores needs to be created with the following values:
Attribute Description
NAME
The name of the Datastore
TM_MAD fs_lvm
TYPE SYSTEM_DS
For example:
> cat ds .
conf
NAME = lvm_system
TM_MAD = fs_lvm
TYPE = SYSTEM_DS
BRIDGE_LIST = "NODE1 NODE2"
> onedatastore create ds .
conf
ID: 100
Create an Image Datastore
To create an Image Datastore you just need to define the name, and set the following:
Attribute
NAME
TYPE
DS_MAD
Description
The name of the datastore
IMAGE_DS fs
TM_MAD
DISK_TYPE fs_lvm
BLOCK
BRIDGE_LIST
List of nodes (space separated) with access to the shared storage, used to copy new images.
For example, the following examples illustrates the creation of an LVM datastore using a configuration file. In this case we will use the host host01 as one of our OpenNebula LVM-enabled hosts.
> cat ds .
conf
NAME = production
DS_MAD = fs
TM_MAD = fs_lvm
DISK_TYPE = "BLOCK"
TYPE = IMAGE_DS
SAFE_DIRS = "/var/tmp /tmp"
BRIDGE_LIST = "NODE1 NODE2"
> onedatastore create ds .
conf
ID: 101
8.5 Raw Device Mapping (RDM) Datastore
The RDM Datastore is an Image Datastore that enables raw access to node block devices.
Warning: The datastore should only be usable by the administrators. Letting users create images in this datastore will cause security problems. For example, register an image /dev/sda and reading the host filesystem.
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8.5.1 Datastore Layout
The RDM Datastore is used to register already existent block devices in the nodes. The devices should be already setup and available and, VMs using these devices must be fixed to run in the nodes ready for them. Additional virtual machine files, like deployment files or volatile disks are created as regular files.
8.5.2 Frontend Setup
No addtional setup is required.
8.5.3 Node Setup
The devices you want to attach to a VM should be accessible by the hypervisor. As KVM usually runs as oneadmin, make sure this user is in a group with access to the disk (like disk) and has read write permissions for the group.
8.5.4 OpenNebula Configuration
Once the storage is setup, the OpenNebula configuration comprises two steps:
• Create a System Datastore
• Create an Image Datastore
Create a System Datastore
The RDM Datastore can work with the following System Datastores:
• Filesystem, shared transfer mode
• Filesystem, ssh transfer mode
Please refer to the
for more details. Note that the System Datastore is only used for volatile disks and context devices.
Create an Image Datastore
To create an Image Datastore you just need to define the name, and set the following:
Attribute
NAME
TYPE
Description
The name of the datastore
IMAGE_DS
DS_MAD
TM_MAD dev dev
DISK_TYPE BLOCK
An example of datastore:
> cat rdm .
conf
NAME = rdm_datastore
TYPE
DS_MAD
=
=
"IMAGE_DS"
"dev"
TM_MAD = "dev"
DISK_TYPE = "BLOCK"
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> onedatastore create rdm .
conf
ID: 101
8.5.5 Datastore Usage
New images can be added as any other image specifying the path. If you are using the CLI do not use the shorthand parameters as the CLI check if the file exists and the device most provably won’t exist in the frontend. As an example here is an image template to add a node disk /dev/sdb:
NAME = scsi_device
PATH =/ dev / sdb
PERSISTENT = YES
Note: As this datastore does is just a container for existing devices images does not take any size from it. All devices registered will render size of 0 and the overall devices datastore will show up with 1MB of available space
8.6 iSCSI - Libvirt Datastore
This datastore is used to register already existing iSCSI volume available to the hypervisor nodes
Warning: The datastore should only be usable by the administrators. Letting users create images in this datastore can cause security problems.
8.6.1 Frontend Setup
No addtional configuration is needed
8.6.2 Node Setup
The nodes need to meet the following requirements: * The devices you want to attach to a VM should be accessible by the hypervisor. * Qemu needs to be compiled with Libiscsi support.
iSCSI CHAP Authentication
In order to use CHAP authentication, you will need to create a libvirt secret in all the hypervisors. Follow this Libvirt
Secret XML format guide to register the secret. Take this into consideration:
• incominguser field on the iSCSI authentication file should match the Datastore’s ISCSI_USER parameter.
• <target> field in the secret XML document will contain the ISCSI_USAGE paremeter.
• Do this in all the hypervisors.
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8.6.3 OpenNebula Configuration
Once the storage is setup, the OpenNebula configuration comprises two steps:
• Create a System Datastore
• Create an Image Datastore
Create a System Datastore
The RDM Datastore can work with the following System Datastores:
• Filesystem, shared transfer mode
• Filesystem, ssh transfer mode
Please refer to the
for more details. Note that the System Datastore is only used for volatile disks and context devices.
Create an Image Datastore
To create an Image Datastore you just need to define the name, and set the following:
Attribute
NAME
TYPE
Description
The name of the datastore
IMAGE_DS
DS_MAD
TM_MAD iscsi iscsi
DISK_TYPE ISCSI
ISCSI_HOST iSCSI Host. Example: host or host:port.
If you need to use CHAP authentication (optional) add the following attributes to the datastore:
Attribute Description
ISCSI_USAGE
Usage of the secret with the CHAP Auth string.
ISCSI_USER user the iSCSI CHAP authentication.
An example of datastore:
> cat iscsi .
ds
NAME = iscsi
DISK_TYPE = "ISCSI"
DS_MAD = "iscsi"
TM_MAD = "iscsi"
ISCSI_HOST = "the_iscsi_host"
ISCSI_USER = "the_iscsi_user"
ISCSI_USAGE = "the_iscsi_usage"
> onedatastore create iscsi .
ds
ID: 101
Warning: Images created in this datastore should be persistent. Making the images non persistent allows more than one VM use this device and will probably cause problems and data corruption.
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8.6.4 Datastore Usage
New images can be added as any other image specifying the path. If you are using the CLI do not use the shorthand parameters as the CLI check if the file exists and the device most provably won’t exist in the frontend.
As an example here is an image template to add a node disk iqn.1992-01.com.
example:storage:diskarrays-sn-a8675309
:
NAME = iscsi_device
PATH = iqn .
1992 01.
com .
example:storage:diskarrays sn a8675309
PERSISTENT = YES
Warning: As this datastore does is just a container for existing devices images does not take any size from it. All devices registered will render size of 0 and the overall devices datastore will show up with 1MB of available space
Note: You may override the any of the following: ISCSI_HOST, ISCSI_USER`, ISCSI_USAGE and
ISCSI_IQN parameters in the image template. These overridden parameters will come into effect for new Virtual
Machines.
Here is an example of an iSCSI LUN template that uses the iSCSI transfer manager.
oneadmin@onedv:~/exampletemplates$ more iscsiimage.tpl
NAME=iscsi_device_with_lun
PATH=iqn.2014.01.192.168.50.61:test:7cd2cc1e/0
ISCSI_HOST=192.168.50.61
PERSISTENT=YES
Note the explicit “/0” at the end of the IQN target path. This is the iSCSI LUN ID.
8.7 The Kernels & Files Datastore
The Files Datastore lets you store plain files to be used as VM kernels, ramdisks or context files. The Files Datastore does not expose any special storage mechanism but a simple and secure way to use files within VM templates. There is a Files Datastore (datastore ID: 2) ready to be used in OpenNebula.
8.7.1 Requirements
There are no special requirements or software dependencies to use the Files Datastore. The recommended drivers make use of standard filesystem utils (cp, ln, mv, tar, mkfs...) that should be installed in your system.
8.7.2 Configuration
Most of the configuration considerations used for disk images datastores do apply to the Files Datastore (e.g. driver setup, cluster assignment, datastore management...).
The specific attributes for this datastore driver are listed in the following table, you will also need to complete with the common datastore attributes:
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Attribute Description
TYPE Use FILE_DS to setup a Files datastore
DS_MAD
The DS type, use fs to use the file-based drivers
TM_MAD Transfer drivers for the datastore, use ssh to transfer the files
For example, the following illustrates the creation of File Datastore.
> cat kernels_ds .
conf
NAME = kernels
DS_MAD = fs
TM_MAD = ssh
TYPE = FILE_DS
SAFE_DIRS = / var / tmp / files
> onedatastore create kernels_ds .
conf
ID: 100
> onedatastore list
ID NAME
0 system
1 default
2 files
100 kernels
CLUSTER
-
-
-
-
IMAGES TYPE DS
0 sys -
0 img dummy
0 fil fs
0 fil fs
TM dummy dummy ssh ssh
The DS and TM MAD can be changed later using the onedatastore update command. You can check more details of the datastore by issuing the onedatastore show command.
8.7.3 Host Configuration
The recommended ssh driver for the File Datastore does not need any special configuration for the hosts. Just make sure that there is enough space under $DATASTORE_LOCATION to hold the VM files in the front-end and hosts.
For more details
refer to the Filesystem Datastore guide , as the same configuration guidelines applies.
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CHAPTER
NINE
OPEN CLOUD NETWORKING SETUP
9.1 Overview
When a new Virtual Machine is launched, OpenNebula will connect its network interfaces (defined by NIC attribute) to hypervisor physical devices as defined in the Virtual Network. This will allow the VM to have access to different networks, public or private.
OpenNebula supports four different networking modes:
•
configured to use security groups and network isolation.
•
VLAN . Virtual Networks are implemented through 802.1Q VLAN tagging.
•
and IP multicast.
•
Open vSwitch . Similar to the VLAN mode but using an openvswitch instead of a Linux bridge.
When you create a new network you will need to add the attribute VN_MAD to the template, specifying which of the above networking modes you want to use.
Note: Security Groups are not supported by the Open vSwitch mode.
Finally, the networking stack of OpenNebula can be integrated with an external IP address manager (IPAM). To do so, you need to develop the needed glue, for more details refer to the IPAM driver guide.
9.1.1 How Should I Read This Chapter
Before reading this chapter make sure you have read the
chapter.
Start by reading the common
section to learn how to configure your hosts, and then proceed to the specific section for the networking mode that you are interested in.
After reading this chapter you can complete your OpenNebula installation by optionally enabling an
or configuring
Sunstone . Otherwise you are ready to Operate your Cloud.
9.1.2 Hypervisor Compatibility
This chapter applies only to KVM.
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9.2 Node Setup
Todo
• Architect
• KVM
This guide includes specific node setup steps to enable each network mode. You only need to apply the corresponding section to the select mode.
9.2.1 Bridged Networking Mode
Requirements
• The OpenNebula node packages has been installed, see
the KVM node installation section
for more details.
• By default, network isolation is provided through ebtables, this package needs to be installed in the nodes.
Configuration
• Create a linux bridge for each network that would be expose to Virtual Machines. Use the same name in all the nodes.
• Add the physical network interface to the bridge.
For example, a node with two networks one for public IP addresses (attached to eth0) and another one for private traffic (NIC eth1) should have two bridges:
$ brctl show bridge name bridge id br0
STP enabled interfaces
8000.001e682f02ac no eth0 br1 8000.001e682f02ad no eth1
Note: It is recommended that this configuration is made persistent. Please refer to the network configuration guide of your system to do so.
9.2.2 VLAN Networking Mode
Requirements
• The OpenNebula node packages has been installed, see
the KVM node installation section
for more details.
• The 8021q module must be loaded in the kernel.
• A network switch capable of forwarding VLAN tagged traffic. The physical switch ports should be VLAN trunks.
Configuration
No additional configuration is needed.
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9.2.3 VXLAN Networking Mode
Requirements
• The OpenNebula node packages has been installed, see
the KVM node installation section
for more details.
• The node must run a Linux kernel (>3.7.0) that natively supports the VXLAN protocol and the associated iproute2 package.
• When all the nodes are connected to the same broadcasting domain be sure that the multicast traffic is not filtered by any iptable rule in the nodes. Note that if the multicast traffic needs to traverse routers a multicast protocol like IGMP needs to be configured in your network.
Configuration
No additional configuration is needed.
9.2.4 Open vSwitch Networking Mode
Requirements
• The OpenNebula node packages has been installed, see
the KVM node installation section
for more details.
• You need to install Open vSwitch on each node. Please refer to the Open vSwitch documentation to do so.
For example, a node that forwards Virtual Networks traffic through the enp0s8 network interface should create an openvswitch like:
# ovs-vsctl show c61ba96f-fc11-4db9-9636-408e763f529e
Bridge "ovsbr0"
Port "ovsbr0"
Interface "ovsbr0" type: internal
Port "enp0s8"
Interface "enp0s8"
Configuration
• Create a openvswitch for each network that would be expose to Virtual Machines. Use the same name in all the nodes.
• Add the physical network interface to the openvswitch.
Note: It is recommended that this configuration is made persistent. Please refer to the network configuration guide of your system to do so.
9.3 Bridged Networking
This guide describes how to deploy Bridged networks. In this mode virtual machine traffic is directly bridged through an existing Linux bridge in the nodes. Bridged networks can operate on three different modes depending on the
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additional traffic filtering made by OpenNebula:
• Dummy, no filtering is made
• Security Group, iptables rules are installed to implement security groups rules.
• ebtables VLAN, same as above plus additional ebtables rules to isolate (L2) each Virtual Networks.
9.3.1 Considerations & Limitations
The following needs to be considered regarding traffic isolation:
• In the Dummy and Security Group modes you can add tagged network interfaces to achieve network isolation.
This is the recommended deployment strategy in production environments in this mode.
• The ebtables VLAN mode is targeted to small environments without proper hardware support to implement
VLANS. Note that it is limited to /24 networks, and that IP addresses cannot overlap between Virtual Networks.
This mode is only recommended for testing purposes.
9.3.2 OpenNebula Configuration
No specific configuration is required for bridged networking
9.3.3 Defining a Bridged Network
To create a 802.1Q network include the following information:
Attribute
VN_MAD
Value
• dummy for the Dummy
Bridged mode
• fw for Bridged with Security
Groups
• ebtables for Bridged with ebtables isolation
Mandatory
YES
BRIDGE Name of the linux bridge in the nodes
YES
The following example defines Bridged network using the Security Groups mode:
NAME = "bridged_net"
VN_MAD = "fw"
BRIDGE = vbr1
...
9.3.4 ebtables VLAN Mode: default rules
This section lists the ebtables rules that are created, in case you need to debug your setup
# Drop packets that don't match the network's MAC Address
-s ! <mac_address>/ff:ff:ff:ff:ff:0 -o <tap_device> -j DROP
# Prevent MAC spoofing
-s ! <mac_address> -i <tap_device> -j DROP
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9.4 802.1Q VLAN Networks
This guide describes how to enable Network isolation provided through host-managed VLANs. This driver will create a bridge for each OpenNebula Virtual Network and attach an VLAN tagged network interface to the bridge. This mechanism is compliant with IEEE 802.1Q
.
The VLAN id will be the same for every interface in a given network, automatically computed by OpenNebula. It may also be forced by specifying an VLAN_ID parameter in the Virtual Network template.
9.4.1 OpenNebula Configuration
The VLAN_ID is calculated according to this configuration option of oned.conf:
# VLAN_IDS: VLAN ID pool for the automatic VLAN_ID assigment. This pool
# is for 802.1Q networks (Open vSwitch and 802.1Q drivers). The driver
# will try first to allocate VLAN_IDS[START] + VNET_ID
# start: First VLAN_ID to use
#
# reserved: Comma separated list of VLAN_IDs or ranges. Two numbers separated by a colon indicate a range.
VLAN_IDS = [
START = "2" ,
RESERVED = "0, 1, 4095"
]
By modifying that parameter you can reserve some VLANs so they aren’t assigned to a Virtual Network. You can also define the first VLAN_ID. When a new isolated network is created, OpenNebula will find a free VLAN_ID from the
VLAN pool. This pool is global, and it’s also shared with the
network mode.
The following configuration attributes can be adjusted in
/var/lib/one/remotes/vnm/
OpenNebulaNetwork.conf
:
Parameter Description validate_vlan_id Set to true to check that no other vlans are connected to the bridge
9.4.2 Defining a 802.1Q Network
To create a 802.1Q network include the following information:
Attribute
VN_MAD
PHYDEV
BRIDGE
VLAN_ID
AUTO-
MATIC_VLAN_ID
MTU
Value
802.1Q
Name of the physical network device that will be attached to the bridge.
Name of the linux bridge, defaults to onebr<net_id> or onebr.<vlan_id>
The VLAN ID, will be generated if not defined and
AUTOMATIC_VLAN_ID is set to YES
Mandatory and must be set to YES if VLAN_ID hasn’t been defined
The MTU for the tagged interface and bridge
The following example defines a 802.1Q network
NAME = "hmnet"
VN_MAD = "802.1Q"
Mandatory
YES
YES
NO
YES (unless
AUTOMATIC_VLAN_ID
)
YES (unless VLAN_ID)
NO
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PHYDEV = "eth0"
VLAN_ID = 50
BRIDGE = "brhm"
# optional. If not setting VLAN_ID set AUTOMATIC_VLAN_ID = "YES"
# optional
In this scenario, the driver will check for the existence of the brhm bridge. If it doesn’t exist it will be created. eth0 will be tagged (eth0.50) and attached to brhm (unless it’s already attached).
9.5 VXLAN Networks
This guide describes how to enable Network isolation provided through the VXLAN encapsulation protocol. This driver will create a bridge for each OpenNebula Virtual Network and attach a VXLAN tagged network interface to the bridge.
The VLAN id will be the same for every interface in a given network, calculated automatically by OpenNebula. It may also be forced by specifying an VLAN_ID parameter in the Virtual Network template.
Additionally each VLAN has associated a multicast address to encapsulate L2 broadcast and multicast traffic. This address is assigned by default to the 239.0.0.0/8 range as defined by RFC 2365 (Administratively Scoped IP Multicast).
In particular the multicast address is obtained by adding the VLAN_ID to the 239.0.0.0/8 base address.
9.5.1 Considerations & Limitations
This driver works with the default UDP server port 8472.
VXLAN traffic is forwarded to a physical device, this device can be set to be a VLAN tagged interface, but in that case you must make sure that the tagged interface is manually created first in all the hosts.
9.5.2 OpenNebula Configuration
It is possible specify the start VLAN ID by configuring /etc/one/oned.conf:
# VXLAN_IDS: Automatic VXLAN Network ID (VNI) assigment. This is used
# for vxlan networks.
# start: First VNI to use
VXLAN_IDS = [
START = "2"
]
The following configuration attributes can be adjusted in /var/lib/one/remotes/vnm/
OpenNebulaNetwork.conf
:
Parameter vxlan_mc vxlan_ttl
Description
Base multicast address for each VLAN. The multicas sddress is vxlan_mc + vlan_id
Time To Live (TTL) should be > 1 in routed multicast networks (IGMP) validate_vlan_id Set to true to check that no other vlans are connected to the bridge
9.5.3 Defining a VXLAN Network
To create a VXLAN network include the following information:
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Attribute Value
VN_MAD vxlan
PHYDEV Name of the physical network device that will be attached to the bridge.
YES
BRIDGE
Name of the linux bridge, defaults to onebr<net_id> or onebr.<vlan_id> NO
VLAN_ID
MTU
The VLAN ID, will be generated if not defined
The MTU for the tagged interface and bridge
Mandatory
YES
NO
NO
The following example defines a VXLAN network
NAME = "vxlan_net"
VN_MAD = "vxlan"
PHYDEV = "eth0"
VLAN_ID = 50 # optional
BRIDGE = "vxlan50" # optional
...
In this scenario, the driver will check for the existence of the vxlan50 bridge. If it doesn’t exist it will be created.
eth0 will be tagged (eth0.50) and attached to vxlan50 (unless it’s already attached). Note that eth0 can be a
802.1Q tagged interface if you want to isolate the OpenNebula VXLAN traffic.
9.6 Open vSwitch Networks
This guide describes how to use the Open vSwitch network drives. They provide network isolation using VLANs by tagging ports and basic network filtering using OpenFlow. Other traffic attributes that may be configured through
Open vSwitch are not modified.
The VLAN id will be the same for every interface in a given network, calculated automatically by OpenNebula. It may also be forced by specifying an VLAN_ID parameter in the Virtual Network template.
Warning: This driver is not compatible with Security Groups.
9.6.1 OpenNebula Configuration
The VLAN_ID is calculated according to this configuration option of oned.conf:
# VLAN_IDS: VLAN ID pool for the automatic VLAN_ID assigment. This pool
# is for 802.1Q networks (Open vSwitch and 802.1Q drivers). The driver
# will try first to allocate VLAN_IDS[START] + VNET_ID
# start: First VLAN_ID to use
#
# reserved: Comma separated list of VLAN_IDs or ranges. Two numbers separated by a colon indicate a range.
VLAN_IDS = [
START = "2" ,
RESERVED = "0, 1, 4095"
]
By modifying that parameter you can reserve some VLANs so they aren’t assigned to a Virtual Network. You can also define the first VLAN_ID. When a new isolated network is created, OpenNebula will find a free VLAN_ID from the
VLAN pool. This pool is global, and it’s also shared with the
network mode.
The following configuration attributes can be adjusted in
/var/lib/one/remotes/vnm/
OpenNebulaNetwork.conf
:
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Parameter Description arp_cache_poisoning Enable ARP Cache Poisoning Prevention Rules.
Note: Remember to run onehost sync to deploy the file to all the nodes.
9.6.2 Defining an Open vSwitch Network
To create an Open vSwitch network, include the following information:
Attribute Value
VN_MAD ovswitch
BRIDGE Name of the Open vSwitch switch to use
Mandatory
YES
YES
VLAN_ID The VLAN ID, will be generated if not defined NO
The following example defines an Open vSwitch network
NAME = "ovswitch_net"
VN_MAD = "ovswitch"
BRIDGE = vbr1
VLAN_ID = 50 # optional
...
Multiple VLANs (VLAN trunking)
VLAN trunking is also supported by adding the following tag to the NIC element in the VM template or to the virtual network template:
• VLAN_TAGGED_ID: Specify a range of VLANs to tag, for example: 1,10,30,32.
9.6.3 OpenFlow Rules
This section lists de default openflow rules installed in the open vswitch.
Mac-spoofing
These rules prevent any traffic to come out of the port if the MAC address has changed.
in_port =< PORT > ,dl_src =< MAC > ,priority = 40000 ,actions = normal in_port =< PORT > ,priority = 39000 ,actions = normal
IP hijacking
These rules prevent any traffic to come out of the port for IPv4 if an IP address is not configured for a VM in_port =< PORT > ,arp,dl_src =< MAC > priority = 45000 ,actions = drop in_port =< PORT > ,arp,dl_src =< MAC > ,nw_src =< IP > ,priority = 46000 ,actions = normal
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Black ports (one rule per port)
tcp,dl_dst =< MAC > ,tp_dst =< PORT > ,actions = drop
ICMP Drop
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CHAPTER
TEN
REFERENCES
10.1 Overview
This Chapter covers references that apply to the configuration of OpenNebula to interact smoothly and efficiently with other datacenter components, as well as information on where are the log files, the database tool, and all the configuration parameters of the OpenNebula core daemon.
10.1.1 How Should I Read This Chapter
The
is the main OpenNebula configuration file, and it is essential to tweak the performance and behavior of your OpenNebula installation. The section
contains more helpful pointers to tune the
OpenNebula performance.
Read
for a complete reference on how to use log files, and how to adjust the verbosity and log subsystem.
For database maintenance operations, use the
command line tool onedb . It can be used to get information from an
OpenNebula database, upgrade it, or fix inconsistency problems.
10.1.2 Hypervisor Compatibility
This chapter applies to all the hypervisors.
10.2 ONED Configuration
The OpenNebula daemon oned manages the cluster nodes, virtual networks, virtual machines, users, groups and storage datastores. The configuration file for the daemon is called oned.conf and it is placed inside the /etc/one directory. In this reference document we describe all the format and options that can be specified in oned.conf.
10.2.1 Daemon Configuration Attributes
• MANAGER_TIMER : Time in seconds the core uses to evaluate periodical functions.
MONITOR-
ING_INTERVAL cannot have a smaller value than MANAGER_TIMER.
• MONITORING_INTERVAL : Time in seconds between each monitorization.
• MONITORING_THREADS : Max. number of threads used to process monitor messages
• HOST_PER_INTERVAL: Number of hosts monitored in each interval.
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• HOST_MONITORING_EXPIRATION_TIME: Time, in seconds, to expire monitoring information. Use 0 to disable HOST monitoring recording.
• VM_INDIVIDUAL_MONITORING: VM monitoring information is obtained along with the host information.
For some custom monitor drivers you may need activate the individual VM monitoring process.
• VM_PER_INTERVAL: Number of VMs monitored in each interval.
• VM_MONITORING_EXPIRATION_TIME: Time, in seconds, to expire monitoring information. Use 0 to disable VM monitoring recording.
• SCRIPTS_REMOTE_DIR: Remote path to store the monitoring and VM management script.
• PORT : Port where oned will listen for xml-rpc calls.
• LISTEN_ADDRESS: Host IP to listen on for xmlrpc calls (default: all IPs).
• DB : Vector of configuration attributes for the database back-end.
– backend : Set to sqlite or mysql. Please visit the
for more information.
– server (MySQL only): Host name or an IP address for the MySQL server.
– user (MySQL only): MySQL user’s login ID.
– passwd (MySQL only): MySQL user’s password.
– db_name (MySQL only): MySQL database name.
• VNC_PORTS : VNC port pool for automatic VNC port assignment, if possible the port will be set to START +
VMID
. Refer to the VM template reference for further information:
– start: first port to assign
– reserved: comma separated list of reserved ports or ranges. Two numbers separated by a colon indicate a range.
• VM_SUBMIT_ON_HOLD : Forces VMs to be created on hold state instead of pending. Values: YES or NO.
• LOG : Configure the logging system
– SYSTEM : Can be either file (default), syslog or std
– DEBUG_LEVEL : Sets the level of verbosity of the log messages. Possible values are:
2
3
DEBUG_LEVEL Meaning
0 ERROR
1 WARNING
INFO
DEBUG
Example of this section:
#*******************************************************************************
# Daemon configuration attributes
#*******************************************************************************
LOG = [
SYSTEM = "file" ,
DEBUG_LEVEL = 3
]
#MANAGER_TIMER = 15
MONITORING_INTERVAL = 60
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MONITORING_THREADS = 50
#HOST_PER_INTERVAL = 15
#HOST_MONITORING_EXPIRATION_TIME = 43200
#VM_INDIVIDUAL_MONITORING = "no"
#VM_PER_INTERVAL = 5
#VM_MONITORING_EXPIRATION_TIME = 14400
SCRIPTS_REMOTE_DIR = /var/tmp/one
PORT = 2633
LISTEN_ADDRESS = "0.0.0.0"
DB = [ BACKEND = "sqlite" ]
#
#
#
#
# Sample configuration for MySQL
# DB = [ BACKEND = "mysql",
# SERVER = "localhost",
PORT
USER
PASSWD
= 0,
= "oneadmin",
= "oneadmin",
DB_NAME = "opennebula" ]
VNC_PORTS = [
#
]
START = 5900
RESERVED = "6800, 6801, 9869"
#VM_SUBMIT_ON_HOLD = "NO"
10.2.2 Federation Configuration Attributes
Control the federation capabilities of oned. Operation in a federated setup requires a special DB configuration.
• FEDERATION : Federation attributes.
– MODE : Operation mode of this oned.
* STANDALONE: not federated. This is the default operational mode
* MASTER: this oned is the master zone of the federation
* SLAVE: this oned is a slave zone
• ZONE_ID : The zone ID as returned by onezone command.
• MASTER_ONED : The xml-rpc endpoint of the master oned, e.g.
http://master.one.org:2633/RPC2
#*******************************************************************************
# Federation configuration attributes
#*******************************************************************************
FEDERATION = [
MODE = "STANDALONE" ,
ZONE_ID = 0,
MASTER_ONED = ""
]
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10.2.3 Default Showback Cost
The following attributes define the default cost for Virtual Machines that don’t have a CPU, MEMORY or DISK cost.
This is used by the oneshowback calculate method.
#*******************************************************************************
# Default showback cost
#*******************************************************************************
DEFAULT_COST = [
CPU_COST = 0,
MEMORY_COST = 0,
DISK_COST = 0
]
10.2.4 XML-RPC Server Configuration
• MAX_CONN: Maximum number of simultaneous TCP connections the server will maintain
• MAX_CONN_BACKLOG: Maximum number of TCP connections the operating system will accept on the server’s behalf without the server accepting them from the operating system
• KEEPALIVE_TIMEOUT: Maximum time in seconds that the server allows a connection to be open between
RPCs
• KEEPALIVE_MAX_CONN: Maximum number of RPCs that the server will execute on a single connection
• TIMEOUT: Maximum time in seconds the server will wait for the client to do anything while processing an
RPC. This timeout will be also used when proxy calls to the master in a federation.
• RPC_LOG: Create a separated log file for xml-rpc requests, in /var/log/one/one_xmlrpc.log.
• MESSAGE_SIZE: Buffer size in bytes for XML-RPC responses.
• LOG_CALL_FORMAT: Format string to log XML-RPC calls. Interpreted strings:
– %i – request id
– %m – method name
– %u – user id
– %U – user name
– %l – param list
– %p – user password
– %g – group id
– %G – group name
– %a – auth token
– %% – %
#*******************************************************************************
# XML-RPC server configuration
#*******************************************************************************
#MAX_CONN = 15
#MAX_CONN_BACKLOG = 15
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#KEEPALIVE_TIMEOUT = 15
#KEEPALIVE_MAX_CONN = 30
#TIMEOUT = 15
#RPC_LOG = NO
#MESSAGE_SIZE
#LOG_CALL_FORMAT
= 1073741824
= "Req:%i UID:%u %m invoked %l"
Warning: This functionality is only available when compiled with xmlrpc-c libraires >= 1.32. Currently only the packages distributed by OpenNebula are linked with this library.
10.2.5 Virtual Networks
• NETWORK_SIZE: Here you can define the default size for the virtual networks
• MAC_PREFIX: Default MAC prefix to be used to create the auto-generated MAC addresses is defined here (this can be overwritten by the Virtual Network template)
• VLAN_IDS: VLAN ID pool for the automatic VLAN_ID assignment. This pool is for 802.1Q networks (Open vSwitch and 802.1Q drivers). The driver will try first to allocate VLAN_IDS[START] + VNET_ID
– start: First VLAN_ID to use
– reserved: Comma separated list of VLAN_IDs or ranges. Two numbers separated by a colon indicate a range.
• VXLAN_IDS: Automatic VXLAN Network ID (VNI) assignment. This is used for vxlan networks.
– start: First VNI to use
–
Note: reserved is not supported by this pool
Sample configuration:
#*******************************************************************************
# Physical Networks configuration
#*******************************************************************************
NETWORK_SIZE = 254
MAC_PREFIX = "02:00"
VLAN_IDS = [
START = "2" ,
RESERVED = "0, 1, 4095"
]
VXLAN_IDS = [
START = "2"
]
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10.2.6 Datastores
The
allows users to set up images, which can be operative systems or data, to be used in Virtual
Machines easily. These images can be used by several Virtual Machines simultaneously, and also shared with other users.
Here you can configure the default values for the Datastores and Image templates. You have more information about the templates syntax here.
• DATASTORE_LOCATION: Path for Datastores. It IS the same for all the hosts and front-end. It defaults to
/var/lib/one/datastores (in self-contained mode defaults to $ONE_LOCATION/var/datastores). Each datastore has its own directory (called BASE_PATH) in the form: $DATASTORE_LOCATION/<datastore_id>.
You can symlink this directory to any other path if needed. BASE_PATH is generated from this attribute each time oned is started.
• DATASTORE_CAPACITY_CHECK: Checks that there is enough capacity before creating a new image. Defaults to Yes
• DEFAULT_IMAGE_TYPE : Default value for TYPE field when it is omitted in a template. Values accepted are:
– OS: Image file holding an operating system
– CDROM: Image file holding a CDROM
– DATABLOCK: Image file holding a datablock, created as an empty block
• DEFAULT_DEVICE_PREFIX : Default value for DEV_PREFIX field when it is omitted in a template. The missing DEV_PREFIX attribute is filled when Images are created, so changing this prefix won’t affect existing
Images. It can be set to:
Prefix Device type hd IDE sd vd
SCSI
KVM virtual disk
• DEFAULT_CDROM_DEVICE_PREFIX: Same as above but for CDROM devices.
More information on the image repository can be found in the Managing Virtual Machine Images guide.
Sample configuration:
#*******************************************************************************
# Image Repository Configuration
#*******************************************************************************
#DATASTORE_LOCATION = /var/lib/one/datastores
DATASTORE_CAPACITY_CHECK = "yes"
DEFAULT_IMAGE_TYPE = "OS"
DEFAULT_DEVICE_PREFIX = "hd"
DEFAULT_CDROM_DEVICE_PREFIX = "hd"
10.2.7 Information Collector
This driver CANNOT BE ASSIGNED TO A HOST, and needs to be used with KVM drivers. Options that can be set:
• -a: Address to bind the collectd socket (default 0.0.0.0)
• -p: UDP port to listen for monitor information (default 4124)
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• -f: Interval in seconds to flush collected information (default 5)
• -t: Number of threads for the server (default 50)
• -i: Time in seconds of the monitorization push cycle. This parameter must be smaller than MONITOR-
ING_INTERVAL, otherwise push monitorization will not be effective.
Sample configuration:
IM_MAD = [ name = "collectd" , executable = "collectd" , arguments = "-p 4124 -f 5 -t 50 -i 20" ]
10.2.8 Information Drivers
The information drivers are used to gather information from the cluster nodes, and they depend on the virtualizer you are using. You can define more than one information manager but make sure it has different names. To define it, the following needs to be set:
• name: name for this information driver.
• executable: path of the information driver executable, can be an absolute path or relative to /usr/lib/one/ mads/
• arguments: for the driver executable, usually a probe configuration file, can be an absolute path or relative to
/etc/one/ .
For more information on configuring the information and monitoring system and hints to extend it please check the information driver configuration guide.
Sample configuration:
#-------------------------------------------------------------------------------
# KVM UDP-push Information Driver Manager Configuration
# -r number of retries when monitoring a host
# -t number of threads, i.e. number of hosts monitored at the same time
#-------------------------------------------------------------------------------
IM_MAD = [
NAME = "kvm" ,
SUNSTONE_NAME = "KVM" ,
EXECUTABLE
ARGUMENTS
=
=
"one_im_ssh" ,
"-r 3 -t 15 kvm" ]
#-------------------------------------------------------------------------------
10.2.9 Virtualization Drivers
The virtualization drivers are used to create, control and monitor VMs on the hosts. You can define more than one virtualization driver (e.g. you have different virtualizers in several hosts) but make sure they have different names. To define it, the following needs to be set:
• name: name of the virtualization driver.
• executable: path of the virtualization driver executable, can be an absolute path or relative to /usr/lib/ one/mads/
• arguments: for the driver executable
• type: driver type, supported drivers: xen, kvm or xml
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• default: default values and configuration parameters for the driver, can be an absolute path or relative to /etc/ one/
• keep_snapshots: do not remove snapshots on power on/off cycles and live migrations if the hypervisor supports that.
• imported_vms_actions : comma-separated list of actions supported for imported vms. The available actions are:
– migrate
– live-migrate
– terminate
– terminate-hard
– undeploy
– undeploy-hard
– hold
– release
– stop
– suspend
– resume
– delete
– delete-recreate
– reboot
– reboot-hard
– resched
– unresched
– poweroff
– poweroff-hard
– disk-attach
– disk-detach
– nic-attach
– nic-detach
– snap-create
– snap-delete
For more information on configuring and setting up the Virtual Machine Manager Driver please check the section that suits you:
•
•
Sample configuration:
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#-------------------------------------------------------------------------------
# Virtualization Driver Configuration
#-------------------------------------------------------------------------------
VM_MAD = [
NAME = "kvm" ,
SUNSTONE_NAME = "KVM" ,
EXECUTABLE = "one_vmm_exec" ,
ARGUMENTS
DEFAULT
= "-t 15 -r 0 kvm" ,
= "vmm_exec/vmm_exec_kvm.conf" ,
TYPE = "kvm" ,
KEEP_SNAPSHOTS = "no" ,
IMPORTED_VMS_ACTIONS = "terminate, terminate-hard, hold, release, suspend, resume, delete, reboot, reboot-hard, resched, unresched, disk-attach, disk-detach, nic-attach, nic-detach, snap-create, snap-delete"
]
10.2.10 Transfer Driver
The transfer drivers are used to transfer, clone, remove and create VM images. The default TM_MAD driver includes plugins for all supported storage modes. You may need to modify the TM_MAD to add custom plugins.
• executable: path of the transfer driver executable, can be an absolute path or relative to /usr/lib/one/ mads/
• arguments: for the driver executable:
– -t: number of threads, i.e. number of transfers made at the same time
– -d: list of transfer drivers separated by commas, if not defined all the drivers available will be enabled
For more information on configuring different storage alternatives
please check the storage configuration guide .
Sample configuration:
#-------------------------------------------------------------------------------
# Transfer Manager Driver Configuration
#-------------------------------------------------------------------------------
TM_MAD = [
EXECUTABLE = "one_tm" ,
ARGUMENTS = "-t 15 -d dummy,lvm,shared,fs_lvm,qcow2,ssh,ceph,dev,vcenter,iscsi_
]
˓→ libvirt"
The configuration for each driver is defined in the TM_MAD_CONF section. These values are used when creating a new datastore and should not be modified since they define the datastore behavior.
• name : name of the transfer driver, listed in the -d option of the TM_MAD section
• ln_target : determines how the persistent images will be cloned when a new VM is instantiated.
– NONE: The image will be linked and no more storage capacity will be used
– SELF: The image will be cloned in the Images datastore
– SYSTEM: The image will be cloned in the System datastore
• clone_target : determines how the non persistent images will be cloned when a new VM is instantiated.
– NONE: The image will be linked and no more storage capacity will be used
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– SELF: The image will be cloned in the Images datastore
– SYSTEM: The image will be cloned in the System datastore
• shared : determines if the storage holding the system datastore is shared among the different hosts or not. Valid values: yes or no.
• ds_migrate: set if system datastore migrations are allowed for this TM. Only useful for system datastore TMs.
Sample configuration:
TM_MAD_CONF = [ name = "lvm" , ln_target = "NONE" , clone_target = "SELF" , shared = "yes"
]
TM_MAD_CONF = [ name = "shared" , ln_target = "NONE" , clone_target = "SYSTEM" , shared = "yes" , ds_migrate = "yes"
]
10.2.11 Datastore Driver
The Datastore Driver defines a set of scripts to manage the storage backend.
• executable: path of the transfer driver executable, can be an absolute path or relative to /usr/lib/one/ mads/
• arguments: for the driver executable
– -t number of threads, i.e. number of repo operations at the same time
– -d datastore mads separated by commas
– -s system datastore tm drivers, used to monitor shared system ds
Sample configuration:
DATASTORE_MAD = [
EXECUTABLE = "one_datastore" ,
ARGUMENTS = "-t 15 -d dummy,fs,lvm,ceph,dev,iscsi_libvirt,vcenter -s shared,ssh,
]
˓→ ceph,fs_lvm"
For more information on this Driver and how to customize it, please visit
10.2.12 Marketplace Driver Configuration
Drivers to manage different marketplaces, specialized for the storage back-end
• executable: path of the transfer driver executable, can be an absolute path or relative to /usr/lib/one/mads/
• arguments : for the driver executable
– -t number of threads, i.e. number of repo operations at the same time
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– -m marketplace mads separated by commas
Sample configuration:
MARKET_MAD = [
EXECUTABLE = "one_market" ,
ARGUMENTS = "-t 15 -m http,s3,one"
]
10.2.13 Hook System
Hooks in OpenNebula are programs (usually scripts) which execution is triggered by a change in state in Virtual
Machines or Hosts. The hooks can be executed either locally or remotely in the node where the VM or Host is running. To configure the Hook System the following needs to be set in the OpenNebula configuration file:
• executable: path of the hook driver executable, can be an absolute path or relative to /usr/lib/one/mads/
• arguments : for the driver executable, can be an absolute path or relative to /etc/one/
Sample configuration:
HM_MAD = [ executable = "one_hm" ]
Virtual Machine Hooks (VM_HOOK) defined by:
• name: for the hook, useful to track the hook (OPTIONAL).
• on: when the hook should be executed,
– CREATE, when the VM is created (onevm create)
– PROLOG, when the VM is in the prolog state
– RUNNING, after the VM is successfully booted
– UNKNOWN, when the VM is in the unknown state
– SHUTDOWN, after the VM is shutdown
– STOP, after the VM is stopped (including VM image transfers)
– DONE, after the VM is deleted or shutdown
– CUSTOM, user defined specific STATE and LCM_STATE combination of states to trigger the hook
• command: path can be absolute or relative to /usr/share/one/hooks
• arguments: for the hook. You can access to VM information with $
– $ID, the ID of the virtual machine
– $TEMPLATE, the VM template in xml and base64 encoded multiple
– PREV_STATE, the previous STATE of the Virtual Machine
– PREV_LCM_STATE, the previous LCM STATE of the Virtual Machine
• remote: values,
– YES, The hook is executed in the host where the VM was allocated
– NO, The hook is executed in the OpenNebula server (default)
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Host Hooks (HOST_HOOK) defined by:
• name: for the hook, useful to track the hook (OPTIONAL)
• on: when the hook should be executed,
– CREATE, when the Host is created (onehost create)
– ERROR, when the Host enters the error state
– DISABLE, when the Host is disabled
• command: path can be absolute or relative to /usr/share/one/hooks
• arguments: for the hook. You can use the following Host information:
– $ID, the ID of the host
– $TEMPLATE, the Host template in xml and base64 encoded
• remote: values,
– YES, The hook is executed in the host
– NO, The hook is executed in the OpenNebula server (default)
Sample configuration:
VM_HOOK = [ name on state
= "advanced_hook" ,
= "CUSTOM" ,
= "ACTIVE" , lcm_state = "BOOT_UNKNOWN" , command = "log.rb" , arguments = " $ID $PREV_STATE $PREV_LCM_STATE " ]
10.2.14 Auth Manager Configuration
• AUTH_MAD: The
that will be used to authenticate and authorize OpenNebula requests. If not defined
OpenNebula will use the built-in auth policies
– executable: path of the auth driver executable, can be an absolute path or relative to /usr/lib/one/mads/
– authn: list of authentication modules separated by commas, if not defined all the modules available will be enabled
– authz: list of authentication modules separated by commas
• SESSION_EXPIRATION_TIME: Time in seconds to keep an authenticated token as valid. During this time, the driver is not used. Use 0 to disable session caching
• ENABLE_OTHER_PERMISSIONS: Whether or not to enable the permissions for ‘other’. Users in the oneadmin group will still be able to change these permissions. Values: YES or NO
• DEFAULT_UMASK: Similar to Unix umask, sets the default resources permissions. Its format must be 3 octal digits. For example a umask of 137 will set the new object’s permissions to 640 um- u-- ---
Sample configuration:
AUTH_MAD = [ executable = "one_auth_mad" , authn = "ssh,x509,ldap,server_cipher,server_x509"
]
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SESSION_EXPIRATION_TIME = 900
#ENABLE_OTHER_PERMISSIONS = "YES"
DEFAULT_UMASK = 177
The DEFAULT_AUTH can be used to point to the desired default authentication driver, for example ldap:
DEFAULT_AUTH = "ldap"
10.2.15 Restricted Attributes Configuration
Users outside the oneadmin group won’t be able to instantiate templates created by users outside the ‘’oneadmin” group that include the attributes restricted by:
• VM_RESTRICTED_ATTR: Virtual Machine attribute to be restricted for users outside the ‘’oneadmin” group
• IMAGE_RESTRICTED_ATTR: Image attribute to be restricted for users outside the ‘’oneadmin” group
• VNET_RESTRICTED_ATTR: Virtual Network attribute to be restricted for users outside the ‘’oneadmin” group when updating a reservation. These attributes are not considered for regular VNET creation.
If the VM template has been created by admins in the ‘’oneadmin” group, then users outside the ‘’oneadmin” group can instantiate these templates.
Sample configuration:
VM_RESTRICTED_ATTR = "CONTEXT/FILES"
VM_RESTRICTED_ATTR = "NIC/MAC"
VM_RESTRICTED_ATTR = "NIC/VLAN_ID"
VM_RESTRICTED_ATTR = "NIC/BRIDGE"
VM_RESTRICTED_ATTR = "NIC_DEFAULT/MAC"
VM_RESTRICTED_ATTR = "NIC_DEFAULT/VLAN_ID"
VM_RESTRICTED_ATTR = "NIC_DEFAULT/BRIDGE"
VM_RESTRICTED_ATTR = "DISK/TOTAL_BYTES_SEC"
VM_RESTRICTED_ATTR = "DISK/READ_BYTES_SEC"
VM_RESTRICTED_ATTR = "DISK/WRITE_BYTES_SEC"
VM_RESTRICTED_ATTR = "DISK/TOTAL_IOPS_SEC"
VM_RESTRICTED_ATTR = "DISK/READ_IOPS_SEC"
VM_RESTRICTED_ATTR = "DISK/WRITE_IOPS_SEC"
#VM_RESTRICTED_ATTR = "DISK/SIZE"
VM_RESTRICTED_ATTR = "DISK/ORIGINAL_SIZE"
VM_RESTRICTED_ATTR = "CPU_COST"
VM_RESTRICTED_ATTR = "MEMORY_COST"
VM_RESTRICTED_ATTR = "DISK_COST"
VM_RESTRICTED_ATTR = "PCI"
VM_RESTRICTED_ATTR = "USER_INPUTS"
#VM_RESTRICTED_ATTR = "RANK"
#VM_RESTRICTED_ATTR = "SCHED_RANK"
#VM_RESTRICTED_ATTR = "REQUIREMENTS"
#VM_RESTRICTED_ATTR = "SCHED_REQUIREMENTS"
IMAGE_RESTRICTED_ATTR = "SOURCE"
VNET_RESTRICTED_ATTR = "VN_MAD"
VNET_RESTRICTED_ATTR = "PHYDEV"
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VNET_RESTRICTED_ATTR = "VLAN_ID"
VNET_RESTRICTED_ATTR = "BRIDGE"
VNET_RESTRICTED_ATTR = "AR/VN_MAD"
VNET_RESTRICTED_ATTR = "AR/PHYDEV"
VNET_RESTRICTED_ATTR = "AR/VLAN_ID"
VNET_RESTRICTED_ATTR = "AR/BRIDGE"
OpenNebula evaluates these attributes:
• on VM template instantiate (onetemplate instantiate)
• on VM create (onevm create)
• on VM attach nic (onevm nic-attach) (for example to forbid users to use NIC/MAC)
10.2.16 Inherited Attributes Configuration
The following attributes will be copied from the resource template to the instantiated VMs. More than one attribute can be defined.
• INHERIT_IMAGE_ATTR: Attribute to be copied from the Image template to each VM/DISK.
• INHERIT_DATASTORE_ATTR: Attribute to be copied from the Datastore template to each VM/DISK.
• INHERIT_VNET_ATTR: Attribute to be copied from the Network template to each VM/NIC.
Sample configuration:
#INHERIT_IMAGE_ATTR = "EXAMPLE"
#INHERIT_IMAGE_ATTR = "SECOND_EXAMPLE"
#INHERIT_DATASTORE_ATTR = "COLOR"
#INHERIT_VNET_ATTR = "BANDWIDTH_THROTTLING"
INHERIT_DATASTORE_ATTR = "CEPH_HOST"
INHERIT_DATASTORE_ATTR = "CEPH_SECRET"
INHERIT_DATASTORE_ATTR = "CEPH_USER"
INHERIT_DATASTORE_ATTR = "CEPH_CONF"
INHERIT_DATASTORE_ATTR = "POOL_NAME"
INHERIT_DATASTORE_ATTR = "ISCSI_USER"
INHERIT_DATASTORE_ATTR = "ISCSI_USAGE"
INHERIT_DATASTORE_ATTR = "ISCSI_HOST"
INHERIT_IMAGE_ATTR
INHERIT_IMAGE_ATTR
INHERIT_IMAGE_ATTR
INHERIT_IMAGE_ATTR
=
=
=
=
"ISCSI_USER"
"ISCSI_USAGE"
"ISCSI_HOST"
"ISCSI_IQN"
INHERIT_DATASTORE_ATTR = "GLUSTER_HOST"
INHERIT_DATASTORE_ATTR = "GLUSTER_VOLUME"
INHERIT_DATASTORE_ATTR = "DISK_TYPE"
INHERIT_DATASTORE_ATTR = "ADAPTER_TYPE"
INHERIT_IMAGE_ATTR
INHERIT_IMAGE_ATTR
INHERIT_VNET_ATTR
=
=
=
"DISK_TYPE"
"ADAPTER_TYPE"
"VLAN_TAGGED_ID"
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INHERIT_VNET_ATTR
INHERIT_VNET_ATTR
INHERIT_VNET_ATTR
= "FILTER_IP_SPOOFING"
= "FILTER_MAC_SPOOFING"
= "MTU"
10.2.17 OneGate Configuration
• ONEGATE_ENDPOINT: Endpoint where OneGate will be listening. Optional.
Sample configuration:
ONEGATE_ENDPOINT = "http://192.168.0.5:5030"
10.3 Logging & Debugging
OpenNebula provides logs for many resources. It supports three logging systems: file based logging systems, syslog logging and logging to standard error stream.
In the case of file based logging, OpenNebula keeps separate log files for each active component, all of them stored in
/var/log/one
. To help users and administrators find and solve problems, they can also access some of the error messages from the CLI or the
With syslog or standard error the logging strategy is almost identical, except that the logging message change slightly their format following syslog logging conventions, and resource information.
10.3.1 Configure the Logging System
The Logging system can be changed in
, specifically under the LOG section. Two parameters can
be changed: SYSTEM, which is ‘syslog’, ‘file’ (default) or ‘std’, and the DEBUG_LEVEL is the logging verbosity.
For the scheduler the logging system can be changed in the exact same way. In this case the configuration is in
/etc/one/sched.conf.
10.3.2 Log Resources
There are different log resources corresponding to different OpenNebula components:
• ONE Daemon: The core component of OpenNebula dumps all its logging information onto /var/log/ one/oned.log
. Its verbosity is regulated by DEBUG_LEVEL in /etc/one/oned.conf. By default the one start up scripts will backup the last oned.log file using the current time, e.g. oned.log.20121011151807.
Alternatively, this resource can be logged to the syslog.
• Scheduler: All the scheduler information is collected into the /var/log/one/sched.log file. This resource can also be logged to the syslog.
• Virtual Machines: The information specific of the VM will be dumped in the log file /var/log/one/
<vmid>.log
. All VMs controlled by OpenNebula have their folder, /var/lib/one/vms/<VID>, or to the syslog/stderr if enabled. You can find the following information in it:
– Deployment description files : Stored in deployment.<EXECUTION>, where <EXECUTION> is the sequence number in the execution history of the VM (deployment.0 for the first host, deployment.1 for the second and so on).
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– Transfer description files : Stored in transfer.<EXECUTION>.<OPERATION>, where
<EXECUTION> is the sequence number in the execution history of the VM, <OPERATION> is the stage where the script was used, e.g. transfer.0.prolog, transfer.0.epilog, or transfer.1.cleanup.
• Drivers: Each driver can have activated its ONE_MAD_DEBUG variable in their RC files. If so, error information will be dumped to /var/log/one/name-of-the-driver-executable.log; log information of the drivers is in oned.log.
10.3.3 Logging Format
The structure of an OpenNebula message for a file based logging system is the following: date [Z<zone_id>][module][log_level]: message body
In the case of syslog it follows the standard: date hostname process[pid]: [Z<zone_id>][module][log_level]: message
Where the zone_id is the ID of the zone in the federation, 0 for single zone set ups, module is any of the internal
OpenNebula components: VMM, ReM, TM, etc. And the log_level is a single character indicating the log level: I for info, D for debug, etc.
For the syslog, OpenNebula will also log the Virtual Machine events like this: date hostname process[pid]: [VM id][Z<zone_id>][module][log_level]: message
And similarly for the stderr logging, for oned and VM events the format are: date [Z<zone_id>][module][log_level]: message date [VM id][Z<zone_id>][module][log_level]: message
10.3.4 Virtual Machine Errors
Virtual Machine errors can be checked by the owner or an administrator using the onevm show output:
$ onevm show 0
VIRTUAL MACHINE 0 INFORMATION
ID
NAME
: 0
: one-0
USER
GROUP
STATE
: oneadmin
: oneadmin
: ACTIVE
LCM_STATE
START TIME
END TIME
DEPLOY ID
: PROLOG_FAILED
: 07/19 17:44:20
: 07/19 17:44:31
: -
VIRTUAL MACHINE MONITORING
NET_TX
NET_RX
USED MEMORY
USED CPU
: 0
: 0
: 0
: 0
VIRTUAL MACHINE TEMPLATE
CONTEXT =[
FILES = /tmp/some_file,
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TARGET = hdb ]
CPU = 0.1
ERROR =[
MESSAGE = "Error excuting image transfer script: Error copying /tmp/some_file to /var/
˓→ lib/one/0/images/isofiles" ,
TIMESTAMP = "Tue Jul 19 17:44:31 2011" ]
MEMORY = 64
NAME = one-0
VMID = 0
VIRTUAL MACHINE HISTORY
SEQ
0
HOSTNAME ACTION host01
START TIME PTIME none 07/19 17:44:31 00 00:00:00 00 00:00:00
Here the error tells that it could not copy a file, most probably it does not exist.
Alternatively you can also check the log files for the VM at /var/log/one/<vmid>.log.
Note: Check the Virtual Machines High Availability Guide, to learn how to recover a VM in fail state.
10.3.5 Host Errors
Host errors can be checked executing the onehost show command:
$ onehost show 1
HOST 1 INFORMATION
ID
NAME
STATE
IM_MAD
VM_MAD
TM_MAD
: 1
: host01
: ERROR
: im_kvm
: vmm_kvm
: tm_shared
HOST SHARES
MAX MEM
USED MEM ( REAL )
: 0
: 0
USED MEM ( ALLOCATED ) : 0
MAX CPU : 0
USED CPU ( REAL ) : 0
USED CPU ( ALLOCATED ) : 0
RUNNING VMS : 0
MONITORING INFORMATION
ERROR =[
MESSAGE = "Error monitoring host 1 : MONITOR FAILURE 1 Could not update remotes" ,
TIMESTAMP = "Tue Jul 19 17:17:22 2011" ]
The error message appears in the ERROR value of the monitoring. To get more information you can check /var/ log/one/oned.log
. For example for this error we get in the log file:
Tue Jul 19 17:17:22 2011 [InM][I]: Monitoring host host01 (1)
Tue Jul 19 17:17:22 2011 [InM][I]: Command execution fail: scp -r /var/lib/one/
˓→ remotes/. host01:/var/tmp/one
Tue Jul 19 17:17:22 2011 [InM][I]: ssh: Could not resolve hostname host01: nodename
˓→ nor servname provided, or not known
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Tue Jul 19 17:17:22 2011 [InM][I]: lost connection
Tue Jul 19 17:17:22 2011 [InM][I]: ExitCode: 1
Tue Jul 19 17:17:22 2011 [InM][E]: Error monitoring host 1 : MONITOR FAILURE 1 Could
˓→ not update remotes
From the execution output we notice that the host name is not know, probably a mistake naming the host.
10.4 Onedb Tool
This section describes the onedb CLI tool. It can be used to get information from an OpenNebula database, upgrade it, or fix inconsistency problems.
10.4.1 Connection Parameters
The command onedb can connect to any SQLite or MySQL database. Visit the onedb man page for a complete reference. These are two examples for the default databases:
$ onedb <command> -v --sqlite /var/lib/one/one.db
$ onedb <command> -v -S localhost -u oneadmin -p oneadmin -d opennebula
10.4.2 onedb fsck
Checks the consistency of the DB, and fixes the problems found. For example, if the machine where OpenNebula is running crashes, or looses connectivity with the database, you may have a wrong number of VMs running in a Host, or incorrect usage quotas for some users.
$ onedb fsck --sqlite /var/lib/one/one.db
Sqlite database backup stored in /var/lib/one/one.db.bck
Use 'onedb restore' or copy the file back to restore the DB.
Host 0 RUNNING_VMS has 12 is 11
Host 0 CPU_USAGE has 1200 is 1100
Host 0 MEM_USAGE has 1572864 is 1441792
Image 0 RUNNING_VMS has 6 is 5
User 2 quotas: CPU_USED has 12 is 11.0
User 2 quotas: MEMORY_USED has 1536 is 1408
User 2 quotas: VMS_USED has 12 is 11
User 2 quotas: Image 0 RVMS has 6 is 5
Group 1 quotas: CPU_USED has 12 is 11.0
Group 1 quotas: MEMORY_USED has 1536
Group 1 quotas: VMS_USED has 12 is is 11
1408
Group 1 quotas: Image 0 RVMS has 6 is 5
Total errors found: 12
If onedb fsck shows the following error message:
[UNREPAIRED] History record for VM <<vid>> seq # <<seq>> is not closed (etime = 0)
This is due to bug #4000 . It means that when using accounting or showback, the etime (end-time) of that history record is not set, and the VM is considered as still running when it should not. To fix this problem, locate the time when the
VM was shut down in the logs and then execute this patch to edit the times manually:
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$ onedb patch -v --sqlite /var/lib/one/one.db /usr/lib/one/ruby/onedb/patches/history_
˓→ times.rb
Version read:
Shared tables 4.11.80 : OpenNebula 5.0.1 daemon bootstrap
Local tables 4.13.85 : OpenNebula 5.0.1 daemon bootstrap
Sqlite database backup stored in /var/lib/one/one.db_2015-10-13_12:40:2.bck
Use 'onedb restore' or copy the file back to restore the DB.
> Running patch /usr/lib/one/ruby/onedb/patches/history_times.rb
This tool will allow you to edit the timestamps of VM history records, used to
˓→ calculate accounting and showback.
VM ID: 1
History sequence number: 0
STIME Start time
PSTIME Prolog start time
: 2015-10-08 15:24:06 UTC
: 2015-10-08 15:24:06 UTC
PETIME Prolog end time : 2015-10-08 15:24:29 UTC
RSTIME Running start time : 2015-10-08 15:24:29 UTC
RETIME Running end time : 2015-10-08 15:42:35 UTC
ESTIME Epilog start time
EETIME Epilog end time
ETIME End time
: 2015-10-08 15:42:35 UTC
: 2015-10-08 15:42:36 UTC
: 2015-10-08 15:42:36 UTC
To set new values: empty to use current value; <YYYY-MM-DD HH:MM:SS> in UTC; or 0 to leave unset ( open
˓→ history record ) .
STIME Start time
New value
: 2015-10-08 15:24:06 UTC
:
ETIME End time
New value
: 2015-10-08 15:42:36 UTC
:
The history record # 0 for VM 1 will be updated with these new values:
STIME Start time
PSTIME Prolog start time
PETIME Prolog end time
: 2015-10-08 15:24:06 UTC
: 2015-10-08 15:24:06 UTC
: 2015-10-08 15:24:29 UTC
RSTIME Running start time : 2015-10-08 15:24:29 UTC
RETIME Running end time : 2015-10-08 15:42:35 UTC
ESTIME Epilog start time
EETIME Epilog end time
ETIME End time
: 2015-10-08 15:42:35 UTC
: 2015-10-08 15:42:36 UTC
: 2015-10-08 15:42:36 UTC
Confirm to write to the database [ Y/n ] : y
> Done
> Total time: 27.79s
10.4.3 onedb version
Prints the current DB version.
$ onedb version --sqlite /var/lib/one/one.db
3.8.0
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Use the -v flag to see the complete version and comment.
$ onedb version -v --sqlite /var/lib/one/one.db
Version: 3.8.0
Timestamp: 10/19 16:04:17
Comment: Database migrated from 3.7.80 to 3.8.0
( OpenNebula 3.8.0
) by onedb command.
If the MySQL database password contains special characters, such as @ or #, the onedb command will fail to connect to it.
The workaround is to temporarily change the oneadmin’s password to an ASCII string. The set password statement can be used for this:
$ mysql -u oneadmin -p mysql> SET PASSWORD = PASSWORD ( 'newpass' ) ;
10.4.4 onedb history
Each time the DB is upgraded, the process is logged. You can use the history command to retrieve the upgrade history.
$ onedb history -S localhost -u oneadmin -p oneadmin -d opennebula
Version: 3.0.0
Timestamp: 10/07 12:40:49
Comment: OpenNebula 3.0.0 daemon bootstrap
...
Version: 3.7.80
Timestamp: 10/08 17:36:15
Comment: Database migrated from 3.6.0 to 3.7.80
( OpenNebula 3.7.80
) by onedb
˓→ command.
Version: 3.8.0
Timestamp: 10/19 16:04:17
Comment: Database migrated from 3.7.80 to 3.8.0
( OpenNebula 3.8.0
) by onedb command.
10.4.5 onedb upgrade
The upgrade process is fully documented in the Upgrading from Previous Versions guide.
10.4.6 onedb backup
Dumps the OpenNebula DB to a file.
$ onedb backup --sqlite /var/lib/one/one.db /tmp/my_backup.db
Sqlite database backup stored in /tmp/my_backup.db
Use 'onedb restore' or copy the file back to restore the DB.
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10.4.7 onedb restore
Restores the DB from a backup file. Please not that this tool will only restore backups generated from the same backend, i.e. you cannot backup a SQLite database and then try to populate a MySQL one.
10.4.8 onedb sqlite2mysql
This command migrates from a sqlite database to a mysql database. The procedure to follow is:
• Stop OpenNebula
• Change the DB directive in /etc/one/oned.conf to use MySQL instead of SQLite
• Bootstrap the MySQL Database: oned -i
• Migrate the Database: onedb sqlite2mysql -s <SQLITE_PATH> -u <MYSQL_USER> -p
<MYSQL_PASS> -d <MYSQL_DB>
• Start OpenNebula
10.5 Large Deployments
10.5.1 Monitoring
In KVM environments, OpenNebula supports two native monitoring systems: ssh-pull and udp-push. The former one, ssh-pull is the default monitoring system for OpenNebula <= 4.2, however from OpenNebula 4.4
onwards, the default monitoring system is the udp-push system. This model is highly scalable and its limit (in terms of number of VMs monitored per second) is bounded to the performance of the server running oned and the database server. Read more in the
For vCenter environments, OpenNebula uses the VI API offered by vCenter to monitor the state of the hypervisor and all the Virtual Machines running in all the imported vCenter clusters. The driver is optimized to cache common VM information.
In both environments, our scalability testing achieves the monitoring of tens of thousands of VMs in a few minutes.
10.5.2 Core Tuning
OpenNebula keeps the monitorization history for a defined time in a database table. These values are then used to draw the plots in Sunstone.
These monitorization entries can take quite a bit of storage in your database. The amount of storage used will depend on the size of your cloud, and the following configuration attributes in
• MONITORING_INTERVAL: Time in seconds between each monitorization. Default: 60.
• collectd IM_MAD -i argument (KVM only): Time in seconds of the monitorization push cycle. Default: 20.
• HOST_MONITORING_EXPIRATION_TIME: Time, in seconds, to expire monitoring information. Default:
12h.
• VM_MONITORING_EXPIRATION_TIME: Time, in seconds, to expire monitoring information. Default: 4h.
If you don’t use Sunstone, you may want to disable the monitoring history, setting both expiration times to 0.
Each monitoring entry will be around 2 KB for each Host, and 4 KB for each VM. To give you an idea of how much database storage you will need to prepare, here are some examples:
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Monitoring interval Host expiration # Hosts Storage
20s 12h 200 850 MB
20s 24h 1000 8.2 GB
Monitoring interval VM expiration # VMs Storage
20s 4h 2000 1.8 GB
20s 24h 10000 7 GB
10.5.3 API Tuning
For large deployments with lots of xmlprc calls the default values for the xmlprc server are too conservative. The values you can modify and its meaning are explained in
and the xmlrpc-c library documentation . From our experience these values improve the server behavior with a high amount of client calls:
MAX_CONN = 240
MAX_CONN_BACKLOG = 480
The core is able to paginate some pool answers. This makes the memory consumption decrease and in some cases the parsing faster. By default the pagination value is 2000 objects but can be changed using the environment variable
ONE_POOL_PAGE_SIZE
. It should be bigger that 2. For example, to list VMs with a page size of 5000 we can use:
$ ONE_POOL_PAGE_SIZE = 5000 onevm list
To disable pagination we can use a non numeric value:
$ ONE_POOL_PAGE_SIZE = disabled onevm list
This environment variable can be also used for Sunstone.
10.5.4 Driver Tuning
OpenNebula drivers have by default 15 threads. This is the maximum number of actions a driver can perform at the same time, the next actions will be queued. You can make this value in
10.5.5 Database Tuning
For non test installations use MySQL database. sqlite is too slow for more than a couple hosts and a few VMs.
10.5.6 Sunstone Tuning
Please refer to guide about
Configuring Sunstone for Large Deployments .
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