Hi Marty -
Nagios 3 has improved service dependency check logic, which should solve
any issues you're having with them. Specifically, read about the
predictive dependency check option:
http://nagios.sourceforge.net/docs/3_0/ ... hecks.html
Marty wrote:
> I am having trouble understanding the design of service dependencies
> within Nagios. I thought they could be set up to operate like host
> dependencies. For example:
>
> Service_A is the master service.
>
> Service_B depends on Service_A.
>
> If Service_B changes state (say OK to CRITICAL) as a result of its
> dependency on Service_A, nagios would immediatly follow up with a check
> of Service_A before sending notifications about B.
>
> That is how host dependencies work -- you receive a a single alert saying
> that the router is down rather than about all 50 hosts behind the router.
> However this is not true about service dependencies.
>
> Within the nagios code (checks.c) it appears that if a service changes
> state, nagios follows up with a host check, but not a service dependency
> check. Nagios only takes the last state of the master service. If the
> master service went critical immediately following its check and took down
> dependent services, notifications could be sent out about all dependent
> services before nagios gets back to checking the master service again.**
>
> I want to do the same with service dependencies. Rather than receiving
> many alerts about various dependent services, I would like nagios to
> notify me that the master service is down.
>
> I want to thank nagios developers for all your hard work. I would like to
> contribute back to the group by attempting to add master service checks
> immediately following state changes of dependent services, however I am
> likely unaware of all the issues surrounding the design implementation of
> dependent service checks.
>
> Is there a particular developer I could contact or a discussion thread
> about service dependencies and how/why they were implemented as they are
> in the source?
>
> Thank you agan for any help you can provide.
>
> Regards,
> Marty Combs
>
>
>
> ** I can provide a more detailed description of this situation we are
> having if anyone needs me to.
Ethan Galstad
Nagios Developer
___
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Web: www.nagios.org
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