Situations where Pacemaker cluster is used
What maintenance mode is, its management in a Pacemaker cluster, and what it is used for
Planning maintenance windows and potential concerns
Reduced service availability during the upgrade process
Definition of a rolling and full cluster upgrade process
How to manually start and stop all processes, which Pacemaker cluster controls
The main priority is to ensure High Availability including data consistency.
During an upgrade or change of a production environment process, you must ensure that all requested resources are available and started manually if required.
Safe process to start the cluster again after the update process is complete.
In most cases, administrators enable the services and let the cluster start them in the defined order.