Nagios reporting no output when there is output

[Marc Powell]

On May 15, 2009, at 2:29 PM, Jean-Michel Philippon-Nadeau wrote:

> Thanks for your reply Tom.
> I really appreciate that you take a few minutes of your time to help  
> me
> on this one.
>
> Tom Wlodek wrote:
>> You may also check whether you run it by hand as the right user.  
>> Common
>> mistake is to execute plugins or scripts as one user 9say, root) and
>> then nagios executes them as another one (say "nagios"). It works for
>> user root but not for user nagios.
>
> The Nagios server does not actively check the disk status of every
> monitored server. Each server has a script in it's crontab that checks
> the disks and sends the status via NCSA to the main Nagios server.
>
> Correct me if I'm wrong, but I do not think the user running the  
> script
> on the monitored host can interfere with how the Nagios server will
> parse the answer. Am I right?

Nagios/NSCA don't parse the answer at all, other than to say '(no  
output)' when the passive results or plugin execution have no text  
output. This is most often caused by an error being returned by the  
plugin.

Something is happening, either with the execution of the check_disk  
plugin, the passing of those results to send_nsca or send_nsca's  
transmission of those results to nagios. I expect it's one of the  
first two but you can easily work this issue backwards. Put NSCA into  
debug mode on the nagios server. Observe the check results coming in.  
If they are not correct, add debugging output to your script that's  
executing the plugin and passing the results to send_nsca, have it log  
to a file, to identify where the breakdown is occurring. That should  
guide you on how to fix it.

You could also capture any error output generated by the plugin to  
adding '2>&1' to the end of the check_disk line.

--
Marc


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