RHEL 6 Cluster Admin - 4.2.2. Causing a Node to Leave or Join a Cluster

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4.2.2. Causing a Node to Leave or Join a Cluster

You can use the luci server component of Conga to cause a node to leave an active cluster by stopping all cluster services on the node. You can also use the luci server component of Conga to cause a node that has left a cluster to rejoin the cluster.

Causing a node to leave a cluster does not remove the cluster configuration information from that node, and the node still appears in the cluster node display with a status of Not a cluster member. For information on deleting the node entirely from the cluster configuration, see Section 4.2.4, “Deleting a Member from a Cluster”.

To cause a node to leave a cluster, perform the following steps. This shuts down the cluster software in the node. Making a node leave a cluster prevents the node from automatically joining the cluster when it is rebooted.

From the cluster-specific page, click on Nodes along the top of the cluster display. This displays the nodes that constitute the cluster. This is also the default page that appears when you click on the cluster name beneath Manage Clusters from the menu on the left side of the luci Homebase page.
Select the node you want to leave the cluster by clicking the checkbox for that node.
Select the Leave Cluster function from the menu at the top of the page. This causes a message to appear at the top of the page indicating that the node is being stopped.
Refresh the page to see the updated status of the node.

It is also possible to cause more than one node at a time to leave the cluster by selecting all of the nodes to leave the cluster before clicking on Leave Cluster.

To cause a node to rejoin a cluster, select any nodes you want to have rejoin the cluster by clicking the checkbox for those nodes and selecting Join Cluster. This makes the selected nodes join the cluster, and allows the selected nodes to join the cluster when they are rebooted.