Optimising nagios

Jorgen Lundman lundman at gmo.jp
Fri Dec 10 08:26:46 CET 2004


Heh ok got my message filters wrong so thought this mailling list was totally 
silent!

Anyway, thanks for the reply. One part of the issue does indeed stem from adding 
some ~150 hosts the day before, and that I can not ping (yet).

If I am close to the maximum limit my hardware can handle, then so be it, we 
will get another box, but it is hard to know how much it should be able to 
handle. The documentation naturally avoids mentioning numbers by sticking to 
"medium" and "large" setups.

The gaps in graphs were related to the slowdown, the rrd heatbeat was set to 
600, and it took 15min->20min for Nagios to re-check items (with an interval set 
to 5 mins - which isn't so good)


Is there a way to grep out the duration of check commands, so I can sort out 
which are worth optimising? It seems that I should change some of the heavier 
(mailq/maillog) checks to passive perhaps, as they can take 2-3 minutes to complete.


Is Nagios 2.0 worth trying? Complicated to upgrade?

Sincerely,

Lund



Julian Hein wrote:
> Hi, 
> 
> 
>>I do not know if we have a particularly large setup of 
>>Nagios, but I believe I
>>am starting to see effects of possibly having too many hosts 
>>and service checks.
>>The next-check events seems to lag behind more and more, and 
>>entering into pages
>>like "Status Summary" is very slow. (although, user 
>>responsiveness is not really
>>so important to me as the monitoring is.) Re-submitting a 
>>check immediately can
>>take 4-5 minutes before it takes effect.
> 
> 
>>Anyway, details are:
>>* 46 Down 	0 Unreachable 	522 Up 	2 Pending
> 
> 
> I think your problem is the large number of down hosts, as host check
> block the whole nagios server. Try to disable active checks on this
> hosts and see if you latency goes down.
> 
> Julian
> 
> 
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-- 
Jorgen Lundman       | <lundman at lundman.net>
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