host/service dependencies

[Assaf Flatto]

I know that what you say should work , but when i have a host down i keep getting the alerts for 
each of it's associated services .

any idea what i missed and why this is happening ?


On Tuesday 22 July 2008 14:50:28 Marc Powell wrote:
> On Jul 22, 2008, at 9:17 AM, Assaf Flatto wrote:
> > Hello
> >
> > I'm trying to figure out a way or logic of service /host dependency .
> > In today's dependency logic - there is no correlation between host
> > failure and the host services ,
> > even if the host is down - services are still being checked and
> > reported as critical .
>
> They may be displayed as CRITICAL, and they are, but no alerts are
> sent for them.
>
> > there is a need to designate a specific dependency check for
> > services and then it will only "learn"
> > of the down status .
> >
> > Is there a way to tell nagios that once a server is down - not to
> > check the services assigned to
> > this server ? to me it seems like this
>
> Not really. Nagios is primarily a service monitor and services are
> central to it's check logic. If a service reports a non-OK state,
> Nagios will check the status of the host. If the host reports a non-OK
> state, notifications for services are suppressed but will continue to
> be checked. The service checks are necessary because Nagios uses them
> to determine when the host has recovered. Bear in mind that the normal
> and recommended operation of nagios is without regularly scheduled
> active host checks. In such a configuration, a host recovery would
> never be noticed if service checks were disabled.
>
> > So once the host is down/unknown/pending , all the services on the
> > server are not checked and do not
> > send alerts .
>
> Nagios automagically suppresses alerts for services on down/
> unreachable hosts already. No special configuration is necessary other
> than a host check_command that works correctly.
>
> Pending status means that no services on the host have been checked
> yet. No special action necessary there.
>
> --
> Marc
>
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