How to Join a failed node back to the Cluster.
In a ClearPass cluster setup with Standby Publisher configured, there may be some instances where Publisher failed for some reasons and Standby Publisher got promoted as Cluster Publisher. When we login to the original Publisher, we might a see the below message:
To recover the Original Publisher, we should navigate to Administration --> Server Manager --> Server Configuration and use 'Join server back to Cluster'. In earlier versions >= 6.4, we need to do the below process manually.
After starting the above process, following are the sequence of actions that will take place:
1. Reset the database on the failed Publisher.
2. Make the node as a Subscriber to the current Cluster Publisher.
Cluster configuration summary: