cluster.rst
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cluster.rst
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	.. index::
	single: cluster layer

	The Cluster Layer
	-----------------

	Pacemaker utilizes an underlying cluster layer for two purposes:

	* obtaining quorum
	* messaging between nodes

	.. index::
	single: cluster layer; Corosync
	single: Corosync

	Currently, only Corosync 2 and later is supported for this layer.

	This document assumes you have configured the cluster nodes in Corosync
	already. High-level cluster management tools are available that can configure
	Corosync for you. If you want the lower-level details, see the
	`Corosync documentation <https://corosync.github.io/corosync/>`_.