Monitoring individual nodes in a cluster
In this recipe, we'll learn how to monitor a collection of hosts in a cluster, using the check_cluster plugin included in the standard Nagios Plugins. Being able to monitor more than one host collectively is useful in situations with redundancy; one of a set of hosts being DOWN, perhaps for power conservation or maintenance reasons, is not necessarily a cause for notification. However, if a larger number or all of the hosts were down, we would definitely want to be notified. Using check_cluster allows us to arrange this.
Getting ready
You will need a Nagios Core 3.0 or newer server, and have shell access to change its backend configuration. You will also need to have at least two monitored hosts in a redundant ...
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