parent vs. host dependency

[Sheeri Kritzer]

Carrie,

What I've found is that the host dependency has the following behavior:

Nagios goes to check host A
Nagios sees host A has a dependency on host B
Nagios checks host B
If all is good, Nagios checks host A

With parents:

Nagios checks host A
If host A fails, Nagios checks the parents of host A
...repeat...(nagios walks up the dependency tree of parents of parents until it 
gets to the top)

So, for something like a network switch, you want a parent relationship -- you 
don't want it to check the switch each time it checks the machine, only if the 
machine fails, then check to see if it's the machine or if it's the switch.

We don't use host dependencies here, but we use service dependencies and we 
definitely use parent relationships.

-Sheeri Kritzer
Systems Administrator
University Systems Group
Tufts University
617-627-3925
sheeri.kritzer at tufts.edu


Quoting Cory Visi <merlin at phear.lwz.org>:

> What is the difference between a host parent and a host dependency? 
> Besides what has been mentioned before, that a host depedency can override 
> a parent definition...
> 
> Thank you,
> Cory Visi
> 
> 
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