Host dependencies not being picked up...

[Marc Powell]

On Jun 1, 2009, at 2:24 PM, Andrew Davis wrote:

> Double-checking the docs I think I just realized this...
>
> If I understand this right, the "parents" option is used for Nagios  
> itself (prehaps better re-worded as "internally") to define the  
> network topology for the core host check. If the switch is down, it  
> won't mark a host as Down, only as Unreachable.
>
> For a "host dependency", I have to define something like this:
>
> define hostdependency{
>     host_name            Host A
>     dependent_host_name        Host C
>     notification_failure_criteria    d
>     }

> Am I understanding this right?

Correct.

> What gets me is that what Nagios seems to call a parent is, to me  
> anyway, a network/host dependency. Hosts are dependent on the  
> network and services are dependent on hosts. I guess I'm missing  
> where a "host dependency" would actually be of any value...

Yes, they are very similar... hostdependencies give you more  
flexibility about when it's valid and under what conditions though.  
Like you, I'm hard-pressed to come up with an example of when it's  
actually interesting... I guess the best example I can think of based  
on my understanding is if you have your nagios server on a different  
LAN than two other servers. Server B is dependent on Server A for  
functioning. If ServerA and ServerB are unreachable from nagios, that  
may not be a big deal; they could still be providing services locally  
just fine. If ServerA is down though, that's a different matter.  
*shrug* I could be completely off base on that scenario ;) I don't use  
dependencies <G>

--
Marc


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