PRTG Network Monitor User Manual

Part 6: Ajax Web Interface—Device and Sensor Setup | 8 Sensor Settings

153 SSH Load Average Sensor

6.8.153 SSH Load Average Sensor

The SSH Load Average sensor monitors the load average of a Linux/Unix system using Secure

Shell (SSH). It shows the average system load within a one, five, and 15 minutes interval (each in one channel).

For this sensor type credentials for Linux/Solaris/Mac OS (SSH/WBEM) systems must be defined for the device you want to use the sensor on.

Note: Not all Linux/Unix and Mac OS distributions can be supported by this sensor type.

For a general introduction to SSH monitoring, please see

Monit oring via SSH

1962

section.

Add Sensor

The Add Sensor dialog appears when adding a new sensor on a device manually

220

. It only shows the setting fields that are imperative for creating the sensor. Therefore, you will not see all setting fields in this dialog. You can change all settings in the sensor's Set t ings tab later.

Sensor Settings

On the sensor's details page, click on the Set t ings tab to change settings.

Note: If not set explicitly in a sensor's settings, it will connect to the IP Address or DNS Name defined in the settings of the parent device the sensor is created on.

Basic Sensor Set t ings

Sensor Name

Tags

Priority

Enter a meaningful name to identify the sensor. The name will be shown by default in the device tree and in all alarms.

Enter one or more tags, separated by space or comma. You can use tags to group sensors and use tag-filtered views later on. Tags are not case sensitive. We recommend using the default value. You can add additional tags to it, if you like. Other tags are

automatically inherited

89

from objects further up in the device tree. Those are not visible here.

Select a priority for the sensor. This setting determines where the sensor will be placed in sensor lists. Top priority will be at the top of a list. You can choose from one star (low priority) to five stars

(top priority).

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1302

SSH Specific

Connection Timeout

(Sec.)

Shell Timeout (Sec.)

SSH Port

Use Port Number

Result Handling

Define a timeout for the connection. This is the the time the sensor waits to establish a connection to the host. You should keep this value as low as possible.

Define a timeout for the shell response. This is the time in seconds the sensor waits for the shell to return a response after it has sent its specific command (e.g. cat /proc/loadavg ).

Define which port this sensor will use for the SSH connection.

Choose between:

§ Inherit port number from parent device (default ): Use the port number as defined in the Credentials for Linux/Solaris/Mac

OS (SSH/WBEM) Systems section of the device this sensor is created on.

§ Ent er cust om port number: Do not use the port number from the parent device's settings, but define a different port number below.

This field is only visible if the custom port number setting is enabled above. Enter the port number this sensor will use for the SSH connection. Please enter an integer value.

Define what will be done with the result of the sensor. Choose between:

§ Discard sensor result : Do not store the sensor result.

§ Writ e sensor result t o disk (Filename: "Result of Sensor

[ID].t xt "): Store the last result received from the sensor to the

"Logs (Sensor)" directory (on the Master node, if in a cluster). File name: Result of Sensor [ID].txt

. This is for debugging purposes.

The file will be overridden with each scanning interval. For information on how to find the folder used for storage, please see

Dat a St orage

2074

section.

Sensor Display

Primary Channel

Chart Type

Select a channel from the list to define it as the primary channel. In the device tree, the last value of the primary channel will always be displayed underneath the sensor's name. The available options depend on what channels are available for this sensor. Note: You can set another primary channel later by clicking on the pin symbol of a channel in the sensor's overview tab.

Define how different channels will be shown for this sensor.

§ Show channels independent ly (default ): Show an own graph for each channel.

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Sensor Display

Stack Unit

§ St ack channels on t op of each ot her: Stack channels on top of each other to create a multi-channel graph. This will generate an easy-to-read graph which visualizes the different components of your total traffic. Note: This option cannot be used in combination with manual Vertical Axis Scaling (available in the

Sensor Channels Set t ings

1709

settings).

This setting is only available if stacked graphs are selected above.

Choose a unit from the list. All channels with this unit will be stacked on top of each other. By default, you cannot exclude single channels from stacking, if they use the selected unit.

However, there is an advanced procedure to do so.

Inherited Settings

By default, all following settings are inherited from objects higher in the hierarchy and should be changed there, if necessary. Often, best practice is to change them centrally in the

Root

224

group's settings. To change a setting for this object, disable inheritance by clicking on the check mark symbol in front of the respective setting name. You will then see the options described below.

Scanning Int erval

Scanning Interval The scanning interval determines the time the sensor waits between two scans. Select a scanning interval (seconds, minutes, or hours) from the list. You can change the available intervals in

the system administration

1839

.

Schedules, Dependencies, and Maint enance Window

Note: Inheritance for schedules, dependencies, and maintenance windows cannot be interrupted; the according settings from the parent objects will always be active. However, you can define additional settings here. They will be active in parallel to the parent objects' settings.

Schedule Select a schedule from the list. Schedules can be used to monitor for a certain time span (days, hours) throughout the week. With the period list option it is also possible to pause monitoring for a specific time span. You can create new schedules and edit existing ones in the

account settings

1817

. Note: Schedules are generally inherited. New schedules will be added to existing ones, so all schedules are active.

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Maintenance Window Specify if you want to set-up a one-time maintenance window.

During a maintenance window this object and all child objects will not be monitored. They will enter a paused state then. Choose between:

§ Not set (monit or cont inuously ): No maintenance window will be set.

§ Set up a one-t ime maint enance window: Pause monitoring within a maintenance window.

Maintenance Begins At This field is only visible if maintenance window is enabled above.

Use the date time picker to enter the start date and time of the maintenance window.

Maintenance End At This field is only visible if maintenance window is enabled above.

Use the date time picker to enter the end date and time of the maintenance window.

Dependency Type

Dependency

Define a dependency type. Dependencies can be used to pause monitoring for an object depending on the status of another. You can choose between:

§ Use parent : Pause the current sensor if the device it is created on is in a Down status, or if it is paused by another dependency.

§ Select object : Pause the current sensor if the device it is created on is in an Down status, or if it is paused by another dependency. Additionally, pause the current sensor if a specific other object in the device tree is in a Down status, or if it is paused by another dependency. Select below.

§ Mast er object for parent : Make this sensor the master object for its parent device. The sensor will influence the behavior of the device it is created on: If the sensor is in a Down status, the device will be paused. For example, it is a good idea to make a

Ping sensor the master object for its parent device to pause monitoring for all other sensors on the device in case the device cannot even be pinged. Additionally, the sensor will be paused if the parent group of its parent device is in a Down status, or if it is paused by another dependency.

Note: Testing your dependencies is easy! Simply choose Simulat e

Error St at us from the context menu of an object that other objects depend on. A few seconds later all dependent objects should be paused.

This field is only visible if the select object option is enabled above.

Click on the reading-glass symbol and use the

object selector

159 to choose an object on which the current sensor will be dependent on.

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Delay (Seconds) Define a time span. After the master object for this dependency comes back to an Up status, monitoring of the depending objects will be additionally delayed by the defined time span. This can help avoid false alarms, for example, after a server restart, by giving systems more time for all services to start up. Please enter an integer value in seconds. Note: This setting is not available if you choose this sensor to be the Mast er object for parent . In this case, please define delays in the parent

Device Set t ings

272

or the

superior

Group Set t ings

253

.

Access Right s

User Group Access Define which user group(s) will have access to the object you're editing. A table with user groups and right is shown; it contains all user groups from your setup. For each user group you can choose from the following access rights:

§ Inherit ed: Use the settings of the parent object.

§ None: Users in this group cannot see or edit the object. The object does not show up in lists and in the device tree.

Exception: If a child object is visible to the user, the object is visible in the device tree, though not accessible.

§ Read: Users in this group can see the object and review its monitoring results.

§ Writ e: Users in this group can see the object, review its monitoring results, and edit the object's settings. They cannot edit access rights settings.

§ Full: Users in this group can see the object, review its monitoring results, edit the object's settings, and edit access rights settings.

You can create new user groups in the

Sy st em Administ rat ion—

User Groups

1861

settings. To automatically set all objects further down in the hierarchy to inherit this object's access rights, set a check mark for the Revert children's access right s t o inherit ed option.

For more details about access rights, please see section

User

Access Right s

94

.

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Channel Unit Configurat ion

Channel Unit Types For each type of sensor channel, define the unit in which data is displayed. If defined on probe, group, or device level, these settings can be inherited to all sensors underneath. You can set units for the following channel types (if available):

§ Bandwidt h

§ Memory

§ Disk

§ File

§ Cust om

Note: Custom channel types can be set on sensor level only.

More

Knowledge Base: How and Where Does PRTG Store its Data?

§ http://kb.paessler.com/en/topic/463

Edit Sensor Channels

In order to change display settings, spike filter, and limits, please switch to the sensor's

Overview tab and click on the gear icon of a specific channel. For detailed information, please see

Sensor Channels Set t ings

1709

section.

Notifications

Click on the Not ificat ions tab to change notification triggers. For detailed information, please see

Sensor Not ificat ions Set t ings

1716

section.

Others

For more general information about settings, please see

Object Set t ings

142

section.

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