host check delay problem

[Marc Powell]

> -----Original Message-----
> From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-
> bounces at lists.sourceforge.net] On Behalf Of Dinçer Kavraal
> Sent: Wednesday, March 14, 2007 12:32 PM
> To: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] host check delay problem
> 
> Hi guys,
> 
> I need a patch for Nagios not to stop all checks during a host check. Does
> anybody have such a patch to share?

Yes, it's called nagios-3 (alpha/CVS only at the moment) ;).

> Let me tell you further, who are interested and have time:
> I have set up Nagios to check only up/down state for about 300 hosts.
> However, it could not finish checks in desired time period. Even, my host
> check latency was about 400 secs!.

You shouldn't be using scheduled host checks in any version prior to nagios-3 except for exceptional circumstances. It sounds like you are using them for normal checks.

> I have noticed host checks were unable to be done in parallel. So for each
> host I have added a "HOST STATUS" service to check liveliness of host with
> ping (using host_check_alive plugin). During this process, host check
> latency and service check latency were fallen under 5 secs. Very nice.

Yes, this is what you should be doing if you have no other monitorable services on the host. Nagios is very service-centric. Nagios monitors services first and foremost. Hosts will only be checked when a service on the host fails. If a service is up, then the host _must_ be up. Nagios-3 introduces parallelized host checks and benefits of doing regular host checks in addition to service checks but services are still the primary focus IMHO.

> But, It is impossible for me to say Nagios to check a host five times with
> "1 minute delays" more to decide if a host is down. It checks host 5 times
> eventually with 10 seconds delay. Nothing to do with it.

That's correct, at least for nagios-2 and prior.

--
Marc

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