#### To Configure a Cluster

1. In the tree component, expand the Clusters node.
2. Select the node for the cluster.

   On the General Information page, you can perform several optional tasks, detailed in the following steps.

3. (Optional) Click Start Cluster to start the cluster.

   Note - Before you start a cluster, ensure that the node agents are running. To start a node agent, use the `adadmin` command `start-node-agent`.

   The number of instances stopped and started is listed farther down the page.

4. (Optional) Click Stop Cluster to stop the cluster.

   The number of instances stopped and started is listed farther down the page.

5. (Optional) Click Migrate EJB Timers to migrate the EJB timers from a stopped server instance to another server instance in the cluster.
6. (Optional) Click the name of the configuration to modify the configuration.

   For more information, see Configuration.

7. (Optional) Enable and configure the Group Management Service (GMS) for the instance.

   GMS is a module that provides failure notification for instances in a cluster, and for components such as the transaction service, timer service, ORB and EJB. It also protects computing resources for components that require recovering, allowing for quicker failure recovery.

   1. Click the Enabled checkbox to enable GMS for each instance in the cluster.
   2. In the Heartbeat Port field, type the port number for GMS communication for group members.
   3. In the Heartbeat Address field, type the IP address for GMS communication for group members.

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###### More Information

Equivalent asadmin command

`start-cluster`, `stop-cluster`, migrate-timers

###### See Also

- To Create a Cluster

- To Create Server Instances for a Cluster

- To Configure Applications for a Cluster

- To Configure Resources for a Cluster

- To Delete a Cluster

- To Upgrade Components Without Loss of Service

- To Migrate EJB Timers