You have followed a link to documentation for Pacemaker versions that are no longer supported. Most likely, you want the current documentation. Otherwise, you can find older documentation below. Pacemaker 2.0 Clusters From Scratch demonstrates Pacemaker 1.1 (not updated for 2.0) with Corosync 2 Generated on Wed 02 Dec 2020 04:21:45 PM EST from version: ba59be712 (HEAD -> 2.0, tag: Pacemaker-2.0.5,