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4.4. Managing Nodes in a Corosync-Based Cluster

4.4.1. Adding a New Corosync Node

To add a new node:
  1. Install Corosync and Pacemaker on the new host.
  2. Copy /etc/corosync/corosync.conf and /etc/corosync/authkey (if it exists) from an existing node. You may need to modify the mcastaddr option to match the new node’s IP address.
  3. Start the cluster software on the new host. If a log message containing "Invalid digest" appears from Corosync, the keys are not consistent between the machines.