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3.3. Configuring Fencing for Cluster Members
Once you have completed the initial steps of creating a cluster and creating fence devices, you need to configure fencing for the cluster nodes. To configure fencing for the nodes after creating a new cluster and configuring the fencing devices for the cluster, follow the steps in this section. Note that you must configure fencing for each node in the cluster.
The following sections provide procedures for configuring a single fence device for a node, configuring a node with a backup fence device, and configuring a node with redundant power supplies:
3.3.1. Configuring a Single Fence Device for a Node
Use the following procedure to configure a node with a single fence device.
- From the cluster-specific page, you can configure fencing for the nodes in the cluster by clicking on 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 from the menu on the left side of the luci page.
- Click on a node name. Clicking a link for a node causes a page to be displayed for that link showing how that node is configured.The node-specific page displays any services that are currently running on the node, as well as any failover domains of which this node is a member. You can modify an existing failover domain by clicking on its name.
- On the node-specific page, under , click . This displays the dialog box.
- Enter a for the fencing method that you are configuring for this node. This is an arbitrary name that will be used by Red Hat High Availability Add-On; it is not the same as the DNS name for the device.
- Click . This displays the node-specific screen that now displays the method you have just added under .
- Configure a fence instance for this method by clicking the button that appears beneath the fence method. This displays the drop-down menu from which you can select a fence device you have previously configured, as described in Section 3.2.1, “Creating a Fence Device”.
- Select a fence device for this method. If this fence device requires that you configure node-specific parameters, the display shows the parameters to configure.
Note
For non-power fence methods (that is, SAN/storage fencing), is selected by default on the node-specific parameters display. This ensures that a fenced node's access to storage is not re-enabled until the node has been rebooted. For information on unfencing a node, see thefence_node(8) man page. - Click . This returns you to the node-specific screen with the fence method and fence instance displayed.
