Dependency and performance question

[Assaf Flatto]

On Wednesday 01 April 2009 16:07:49 shadih rahman wrote:
> Hi,
>    I am running nagios on a 2.5 GHZ 4-core 64 bit machine running RHEL5.  I
> am seeing some performance issue in Nagios.  I am doing failover setup.  I
> have another similar machine which has identical config but not doing any
> active checks.  My master machine sends check result using NSCA.  Now I can
> not determine why my master machine is lacking in performace.  I will paste
> my performance data below.  I also have another question about dependency.
>
> 1) if a HOST is down, does the service checks still happens?  I would like
> to setup a dependency where if host is down no service check should take
> place.  How do I go about setting this up.  An exapmple will be much
> appreciated.

when a host is down - ping will not respond , so this is a basic assumption you can work from :

define servicedependency{
        host_name                  host
        service_description             PING
        dependent_host_name        host
        dependent_service_description   load,disk,....
        execution_failure_criteria      c,u,w
        notification_failure_criteria   c,u,w
}
Also i advise you to read this :

http://nagios.telecity1.uk.ssp/docs/dependencies.html


Be advised though a large number of dependencies will increase the load on the machine and will 
cause some preformance change.

-- 
Assaf Flatto
SSP Ops Team
Linux System Administrator
169 Euston Road, London, NW1 2AE





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