Installation guide

</unfence>

</clusternode>

</clusternodes>

<fencedevice agent="fence_sanbox2" ipaddr="san_ip_example"

</fencedevices>

<rm>

</rm>

</cluster>

Note that when you have finished configuring all of the components of your cluster, you will need to

sync the cluster configuration file to all of the nodes, as described in Section 5.15, “ Propagating the

Configuration File to the Cluster Nodes” .

5.7.3. Configuring a Backup Fence Device

You can define multiple fencing methods for a node. If fencing fails using the first method, the system

will attempt to fence the node using the second method, followed by any additional methods you

have configured. To configure a backup fencing method for a node, you configure two methods for a

node, configuring a fence instance for each method.

Note

The order in which the system will use the fencing methods you have configured follows their

order in the cluster configuration file. The first method you configure with the ccs command is

the primary fencing method, and the second method you configure is the backup fencing

method. To change the order, you can remove the primary fencing method from the

configuration file, then add that method back.

Note that at any time you can print a list of fence methods and instances currently configured for a

node by executing the following command. If you do not specify a node, this command will list the

fence methods and instances currently configured for all nodes.

ccs -h host --lsfenceinst [node]

Use the following procedure to configure a node with a primary fencing method that uses a fence

device named my_apc, which uses the fence_apc fencing agent, and a backup fencing device that

uses a fence device named sanswi tch1, which uses the fence_sanbo x2 fencing agent. Since the

sanswi tch1 device is a storage-based fencing agent, you will need to configure unfencing for that

device as well.

1. Add a primary fence method for the node, providing a name for the fence method.

ccs -h host --addmethod method node

For example, to configure a fence method named AP C as the primary method for the node

no d e-0 1. example. co m in the configuration file on the cluster node nod e-

0 1. example. co m, execute the following command:

⁠Chapt er 5. Configuring Red Hat Hig h Availabilit y Add- O n Wit h t he ccs Command