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CentOS High Availability by Mitja Resman

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Two-node cluster configuration

As already mentioned, the quorum provider in the CentOS 7 cluster stack is Corosync version 2. Therefore, the cluster quorum configuration is provided in the corosync.conf configuration file. With the previous Corosync version (version 1), the quorum capabilities were provided by CMAN; with Corosync version 2 included in the CentOS 7 cluster stack, the quorum capabilities are provided by Corosync itself, specifically by the votequorum process.

If you are configuring a two-node cluster on the CentOS 7 cluster stack, you should enable the two_node cluster option by adding the following parameter to the corosync.conf Quorum section:

two_node: 1

By enabling the two_node cluster option, the quorum is artificially set to ...

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