Install Corosync and Pacemaker on the new host.
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.
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.