logic/feature request for dependencies

[jmoseley at pgtv.com]

Peter, I just reviewed the parental relationship documentation.  Yes, it is
true that if switch C has parents router A and router B and both those
parents go down, switch C and any children of switch C will eventually be
deemed unreachable and if configured, notifications will be sent.

The issue is that I want notifications for switch C and children of switch
C suppressed (via the dependencies config) only if both parents are down.
The current logic in the Nagios dependency code will suppress notifications
for switch C (and beyond) if only one parent goes down...  The repercussion
of this would be, for example, if router A goes down, then all
notifications for switch C and children of switch C would be repressed.
During that time while router A is down, if switch C or any children went
down, we wouldn't be notified.


James Moseley




                                                                           
             Peter Westlake                                                
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                                       Re: [Nagios-devel] logic/feature    
                                       request for dependencies            
             03/21/2007 12:03                                              
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jmoseley at pgtv.com writes:

> This has probably been brought up before, so I apologize in advance...
>
> According the dependency documentation, when a dependent host (or
service)
> has two or more parental host (or service) dependencies, if just one of
the
> notification dependencies fail, Nagios will repress notifications for the
> dependent host (service).
>
> With lots of folks using redundant routing and switching, I'd like to see
> logic added to allow for configuration of a dependency setup that would
> require both parental dependencies to fail before repressing
notifications
> of the dependent host/service.
>
> For example, we have a switch C that is hooked up to routers A and B.  If
> just one router goes down, we can still get to switch C.  So in our
Nagios
> host dependency setup, we want host notifications for switch C repressed
> only if BOTH routers A and B go down (ie, both notification dependencies
> fail).

The parent dependencies, which are separate to host dependencies or
service dependencies, work in exactly this way. They are specifically
meant for representing network topology, so I think they would be
just what you need.

Peter.


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