Tweaking Nagios Performance (Checks/Notifications)

[Marc Powell]

On Oct 6, 2009, at 4:57 PM, Mirza Dedic wrote:

> I recently finished moving Nagios from a Virtual machine to bare- 
> bone hardware, on a PowerEdge retired machine (dual-core, 4GB ram,  
> raid-5 10k RPM HDs). My goal is to have a 1 minute window between  
> when a host/service goes down and the time that I receive a message  
> that it is down.

If you really want a 1 minute window then that means that you'll  
either have to check multiple times per minute (max_check_attempts>1,  
interval_length<60) or check only once and trust that as definitive  
(max_check_attempts=1, interval_length=60). You'll probably want to re- 
visit the plugin timeouts, both in nagios.cfg and any that are  
directly supported by the plugins themselves.

If you go with the multiple checks per minute path, you'll need to  
change the value of interval_length in nagios.cfg and every other  
*_interval, both in nagios.cfg and in your host/service/notification  
definitions since they are simply multiples of interval_length.

Be prepared for false-positives unless things are perfect all the  
time. I expect you'll see alerts for non service affecting things such  
as slower ssh logins on busy machines or high RTA or maybe some packet  
loss as routers get busy and de-prioritize ICMP traffic. The more  
frequently you check, the more likely you are to encounter those types  
of things.

--
Marc

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