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CentOS High Availability by Mitja Resman

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Chapter 6. Fencing on CentOS 6

In this chapter, you will learn how to configure and test cluster node fencing on CentOS 6 with CMAN. You will familiarize yourself with the fencing options available and learn the syntax used to configure fencing. You will also learn how to take your fencing configuration for a test drive and make sure it is working as expected.

Fencing

Fencing is an important cluster task. It isolates a computer's cluster node when the node misbehaves, in order to protect the shared cluster resources and prevent cluster disruption. Fencing should not be used in a two-node cluster configuration because the nodes may go on a killing spree and kill each other. To work around this issue, you should implement a Quorum disk, as explained ...

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