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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/>`_.
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