4.4.2. Removing a Corosync Node
Because the messaging and membership layers are the authoritative source for cluster nodes, deleting them from the CIB is not a reliable solution. First one must arrange for corosync to forget about the node (pcmk-1 in the example below).
On the host to be removed:
Stop the cluster: /etc/init.d/corosync stop
Next, from one of the remaining active cluster nodes:
Tell Pacemaker to forget about the removed host:
# crm_node -R pcmk-1
This includes deleting the node from the CIB
This proceedure only works for versions after 1.1.8