check scheduler tuning !

[Thomas Guyot-Sionnest]

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On 29/04/08 03:38 AM, kmizole wrote:
> Hello there,
> 
> I''ve installed a monitoring suite with Nagios and Centreon. But i
> have a problem with scheduling. After one night my scheduler displays
> next checks one hour before the actual time.
> 
> Is there a way to optimize scheduler to get services checks on time.

You're probably having check latency. Look at the "Performance Info"
page... Active Service Check Latency should be near 0. If it's not you
have a problem.

Here's an overview or how scheduling works in Nagios:
http://nagios.sourceforge.net/docs/2_0/checkscheduling.html

Keep in mind that the following things will cause Nagios to stop
processing commands until the external command returns:
Host checks (performed on non-OK states, this can be solved in Nagios 3)
Event handlers
Performance data processing commands
OCSP Commands

- - It's not a good idea to avoid host checks so you'll want to make them
return as fast as possible (using a well-tuned 1-ping check_icmp you can
have ir always return within 1 second).
- - Event handlers should fork before doing any work.
- - Instead of using performance data processing commands you can have
nagios write data to a file of fifo. See:
http://www.nagiosexchange.org/cgi-bin/page.cgi?g=Detailed%2F2520.html;d=1
http://www.control-alt-del.org/code/NPDaemon/
- - Instead of using OCSP commands you can use the perfdata file to
forward commands. See:
http://www.nagioscommunity.org/wiki/index.php/OCP_Daemon

IF you must use the perf/ocsp commands anyways make sure they fork
before doing any work.

You can also have a look at some other things you can tune:
http://nagios.sourceforge.net/docs/2_0/tuning.html

Thomas
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