4 Troubleshooting Introduction Error Message when Viewing a Report

4 Troubleshooting Introduction Error Message when Viewing a Report
CH A P T E R
4
Troubleshooting
Revised: January 12, 2010, OL-12491-06
Introduction
•
Error Message when Viewing a Report, page 4-1
•
Reports Missing Data, page 4-3
Error Message when Viewing a Report
Problem
Apparent Error Message: viewing a report returns with an error message.
Error opening <RRD archive name>.rrd: No such file or directory
Cause and Solution
MRTG did not create RRD DB files. Verify that your <RTM Folder>/sce_<SCE IP>does not contain
*.rrd files.
There are two possible reasons that MRTG did not create the RRD DB files:
Note
1.
MRTG execution failed and you should check the following settings are correct:
2.
Verify the SCE is accessible, for example ping.
3.
Verify the SCE SNMP agent is enabled.
4.
Verify the SCE community string is configured correctly in the RTM user configuration file.
5.
Verify the RTM directory is configured correctly in the user configuration file. The path cannot
contain white space.
Use slash or '\\' as the path delimiter.
6.
Verify the RRDTool bin directory is configured correctly in the user configuration file.
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Chapter 4
Troubleshooting
Error Message when Viewing a Report
Note
Use slash or '\\' as the path delimiter.
7.
Run MRTG from a command prompt and verify that it completes with no errors:
perl <MRTG bin folder>/mrtg<RTM folder>/mrtg-cfg/<SCE address>_scabb_mrtg.cfg
8.
Cron did not invoke MRTG
a. Verify Cron is configured correctly—Check the MRTG invocation command for the specific
SCE platform is correct.
b. If using PyCron, try running MRTG from PyCron GUI and verify it completes with return
code 0
Problem
Apparent Error Message: viewing a report returns with an error message The server encountered an
internal error or misconfiguration and was unable to complete your request.
Cause
This error message appears on Unix/Linux systems if the web server user does not have execution
permissions on the SCE platform's report CGI files.
Solution
Add execution permissions to all users to all.cgi files.
Problem
Apparent Error Message: viewing a report returns with an error message
ERROR: Opening <report image filename>.png' for write: Permission denied.
Cause
This error message appears on Unix/Linux systems if the web server user does not have writing
permissions on the SCE platform's directory in the RTM directory.
Solution
Add write permissions to all users to all SCE directories in the RTM directory.
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Chapter 4
Troubleshooting
Reports Missing Data
Problem
Apparent Error Message: viewing a report returns with an error message
ERROR: opening <RRD archive name>.rrd': Permission denied.
Cause
This error message appears on Unix/Linux systems if the web server user does not have reading
permissions on RRD archive files in the SCE platform's directory.
Solution
Add read permissions to all users to all RRD archive files. Note that the example crontab.txt file created
by the rtmcmd for Unix/Linux systems contains a permissions change command for each monitored
SCE. The permissions change command follows the MRTG invocation.
Reports Missing Data
•
Problem, page 4-3
•
Cause and Solution, page 4-3
Problem
Reports missing data. There is a sheer drop in reported traffic.
Cause and Solution
Cron has stopped invoking MRTG
1.
Verify the *.rrd files in the folder sce_<SCE IP> haven’t been modified during the past 5 minutes.
2.
Verify Cron is configured as a service and that the service active.
3.
Run MRTG from a command line and verify that it completes with no errors.
perl <MRTG bin folder>/mrtg<RTM folder>/mrtg-cfg/<SCE address>_scabb_mrtg.cfg
4.
Check that Cron settings are correct.
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Chapter 4
Troubleshooting
Reports Missing Data
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