Monitoring Distributed Resource

[Chris Beattie]

On 8/7/2012 8:33 AM, Andreas M. Iwanowski wrote:
> I.e. if the primary gateway goes down and the standby takes over, I
> would still like to be notified about host troubles behind the VPN. Only
> if both were to be down nagios should stop sending messages.

Would setting parent/child relationships, and maybe using the 
check_cluster plugin help you?

I have two network core switches.  Every physical host on the network 
has both of those two core switches defined as a parent in Nagios. 
Nagios will continue to check everything as long as at least one of 
those two switches is up.

I did something similar with check_cluster.  To monitor a VMware ESX 
cluster comprising three ESX hosts, I defined a Nagios host for each ESX 
host.  There is another Nagios host to represent the cluster whose host 
check is a check_cluster command.  Every guest has the cluster defined 
as its parent.  If one ESX host goes down, the cluster goes into a 
warning state.  If two or more ESX hosts go down, the cluster enters a 
critical state.

The guests may all have migrated onto the still-running ESX host and 
might still be up, but the monitoring of individual guests can take a 
back seat at that point.

-- 
-Chris

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