Nagios scheduling question

[bobi at netshel.net]

Have you checked out the Distributed Nagios eXecutive (DNX) at Source Forge?

The purpose of this project was to increase service check capacity and
throughput by creating a multi-threaded and distributed service check
architecture around Nagios (it's based on Nagios 2.7)

Bob

>
> I have an issue with one of the client nagios installations where
> nagios is executing checks too rarely and all the options to tune it
> I've tried did not help. Currently they have 2500 services on about
> 120 hosts and nagios seems to execute checks about every 8-9 minutes
> where as what is needed is about every 3-4 minutes. I've tried manual
> tuning with setting 'service_inter_check_delay_method' (I set it to
> 0.05 which is even more aggressively then needed, but it did cause
> slight  improvement over 's') and 'service_interleave_factor' (tried
> setting it to '1' and '2' but results were worse). Now as far as I
> can tell the issue is not scheduling (which nagios does correctly
> within range I want) but time of service check execution which is on
> average 1.5 seconds and nagios does not want to run more concurrent
> processes.
>
> Now the question I have is how to best deal and tune it both using
> current config options and assuming that if I'm pointed to right
> direction that I'd be willing to look at source code and see if
> it can be improved in some way.
>
> On a related note I was looking at the source code and before
> I always thought nagios was more of multi-threaded application
> but based on what I can see (utils.c) it does multi-process
> execution creating new process for each service check (my_system
> function). Is there any interest in improving it? What I'm
> particularly interesting is having several worker threads
> capable of executing embedded perl plugins and without going
> through creation of new process every time.
>
> --
> William Leibzon
> Elan Networks
> william at elan.net
>
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