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Percona Replication Manager – Renaming Cluster Hostnames

Recently I’ve had to rename a node on a production cluster – however, I did not have an experience on this yet so I decided to try on a sandbox and establish a known procedure. Without further ado, assuming we have 3 nodes and we want to rename ha3’s hostname to ha03.

Here we go:

  1. Put ha3 on standby:
  2. Stop the cluster services on the node and delete it from the cluster, because I was using Pacemaker and Corosync, I followed the steps here, then rename the hostname as you would on any Linux system.
  3. Put the whole cluster in maintenance mode and restart the Pacemaker and Corosync services. I could not find a way to rename cleanly without doing this, if I don’t I always end up with ghost nodes on the cluster. Because ha01 is the current Master, I would cycle all cluster services – stopping at ha01 last and starting with it first.
  4. Disable maintenance-mode and verify the 2 actives nodes are up and running:
  5. Then start the cluster services on ha03 which I renamed:

Do you have any more convenient way of doing this?