After follow the guide below, i manage to set up a active-passive cluster node. But i notice that when the main fails and come back on, it does not take back the primary role. What setting i should configure in the crm to ensure that when the primary recover after a fail it takes back as primary from the back up machine?
https://www.theurbanpenguin.com/drbd-pacemaker-ha-cluster-ubuntu-16-04/