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Chapter 4. Cluster Nodes

Table of Contents

4.1. Defining a Cluster Node
4.2. Describing a Cluster Node
4.3. Adding a New Cluster Node
4.3.1. Corosync
4.3.2. Heartbeat
4.4. Removing a Cluster Node
4.4.1. Corosync
4.4.2. Heartbeat
4.5. Replacing a Cluster Node
4.5.1. Corosync
4.5.2. Heartbeat

4.1. Defining a Cluster Node

Each node in the cluster will have an entry in the nodes section containing its UUID, uname and type.
Example 4.1. Example cluster node entry
  <node id="1186dc9a-324d-425a-966e-d757e693dc86" uname="pcmk-1" type="normal"/>

In normal circumstances, the admin should let the cluster populate this information automatically from the communications and membership data. However one can use the crm_uuid tool to read an existing UUID or define a value before the cluster starts.