10.2.2. Promotable clones
If a clone is promotable, its instances can perform a special role that Pacemaker will manage via the promote
and demote
actions of the resource agent.
Services that support such a special role have various terms for the special role and the default role: primary and secondary, master and replica, controller and worker, etc. Pacemaker uses the terms
master and
slave,
but is agnostic to what the service calls them or what they do.
All that Pacemaker cares about is that an instance comes up in the default role when started, and the resource agent supports the promote
and demote
actions to manage entering and exiting the special role.