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CentOS High Availability by Mitja Resman

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Network failure

In the following example, you will perform a cluster node network failure test. Network failure can occur due to network infrastructure equipment failure or cluster node network card failure. It is important to note that the problematic cluster node with network failure could still have access to the shared cluster storage and—therefore—to the cluster data. It is critical for the fencing mechanism to fence the problematic cluster node and make sure that it is offline. In this way, the problematic cluster node can no longer access the cluster data.

The cluster from the following example is configured with a WebSite resource group to provide a website cluster service that includes a cluster IP address and an Apache web server instance. ...

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