Comment 0 for bug 1506004

The pacemaker service/plugin configuration stanza for the corosync version 2 should be put into the separate file instead of the corosync.conf. And it should contain the "ver: 2", because pacemaker must be running as a separate service with the corosync 2.
The plugin mode "ver: 1" is not supported anymore.

#cat /etc/corosync/service.d/pacemaker
service {
        # Load the Pacemaker Cluster Resource Manager (5)
        ver: 2
        name: pacemaker
}

Another point is that there is should be additional configuration file described for Ubuntu case:

# cat /etc/corosync/uidgid.d/pacemaker
uidgid {
  uid: hacluster
  gid: haclient
}

This is required in order to make the first start of pacemaker service to go smoothly and w/o issues. See original issue discovered in Fuel project https://bugs.launchpad.net/fuel/+bug/1493483/comments/8