8.4 Checking Host or Service Clusters as an Entity
Plugins normally check an individual host or service, compare the result with the specified thresholds, and then return an appropriate result. On systems with redundant designs (such as in clusters) you can also check the respective host or service individually. In addition, a check of the virtual host or service provides a clue as to whether or not the virtual system as a whole is reachable. The plugin check_cluster allows more complex values to be queried.
As an example, we will take a host cluster consisting of five identical single systems. One of these hosts may fail without any problem, but if a second one fails, the plugin should issue a WARNING. If a third host should fail, a CRITICAL should ...
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