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4.4.3. Replacing a Corosync Node

The five-step guide to replacing an existing cluster node:
  1. Make sure the old node is completely stopped
  2. Give the new machine the same hostname and IP address as the old one
  3. Install the cluster software :-)
  4. Copy /etc/corosync/corosync.conf and /etc/corosync/authkey (if it exists) to the new node
  5. Start the new cluster node
If a log message containing "Invalid digest" appears from Corosync, the keys are not consistent between the machines.