Make sure the old node is completely stopped.

Give the new machine the same hostname as the old one.

Go to an active cluster node and look up the UUID for the old node in /var/lib/heartbeat/hostcache.

Install the cluster software.

Copy ha.cf and authkeys to the new node.

On the new node, populate its UUID using crm_uuid -w and the UUID obtained earlier.

Start the new cluster node.