February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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There's one final way to force a migration, and it's one we actually suggest for almost all cases. One of the arguments we can pass to crm node is the desired state of the node. Instead of killing the corosync service and rebooting pg1, we could run this command:
crm node standby pg1
This tells Pacemaker that pg1 should no longer be considered a valid target for resources. This also causes Pacemaker to migrate PGServer and any dependencies over to pg2. No matter what the state of Pacemaker is, pg1 will always be listed as Standby in the cluster by crm status.
This is an easy way to perform maintenance that might require multiple reboots or other potentially disruptive changes. To bring pg1 online once again, we would use this ...
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