PostgreSQL 12 High Availability Cookbook - Third Edition

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The crm command is actually a fully functional pseudo-shell. If executed without parameters, it presents a prompt and waits for valid crm commands. These commands include help for every level chosen. For example, to see what options are available when putting node into standby, we can type this input while in a crm shell:

node help standby

Then, we can use what we learned previously and put the node into standby state until it is rebooted and Corosync is started again, like this:

node standby pg1 reboot

This is extremely helpful as Pacemaker has a lot of commands, and it's easy to forget the proper syntax.