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5.5. Adding and Deleting Members

The procedures to add or delete a cluster member vary depending on whether the cluster is a newly configured cluster or a cluster that is already configured and running.
To add a member to a new cluster, refer to Section 5.5.1, “Adding a Member to a New Cluster”.
To add or delete a cluster member in an existing cluster, refer to the following sections:

5.5.1. Adding a Member to a New Cluster

To add a member to a new cluster, follow these steps:
  1. At system-config-cluster, in the Cluster Configuration Tool tab, click Cluster Node.
  2. At the bottom of the right frame (labeled Properties), click the Add a Cluster Node button. Clicking that button causes a Node Properties dialog box to be displayed. For a DLM cluster, the Node Properties dialog box presents text boxes for Cluster Node Name and Quorum Votes (refer to Figure 5.5, “Adding a Member to a New DLM Cluster”). For a GULM cluster, the Node Properties dialog box presents text boxes for Cluster Node Name and Quorum Votes, and presents a checkbox for GULM Lockserver (refer to Figure 5.6, “Adding a Member to a New GULM Cluster”)

    Important

    The number of nodes that can be configured as GULM lock servers is limited to either one, three, or five.
    Adding a Member to a New DLM Cluster

    Figure 5.5. Adding a Member to a New DLM Cluster

    Adding a Member to a New GULM Cluster

    Figure 5.6. Adding a Member to a New GULM Cluster

  3. At the Cluster Node Name text box, specify a node name. The entry can be a name or an IP address of the node on the cluster subnet.

    Note

    Each node must be on the same subnet as the node from which you are running the Cluster Configuration Tool and must be defined either in DNS or in the /etc/hosts file of each cluster node.

    Note

    The node on which you are running the Cluster Configuration Tool must be explicitly added as a cluster member; the node is not automatically added to the cluster configuration as a result of running the Cluster Configuration Tool.
  4. Optionally, at the Quorum Votes text box, you can specify a value; however in most configurations you can leave it blank. Leaving the Quorum Votes text box blank causes the quorum votes value for that node to be set to the default value of 1.
  5. Click OK.
  6. Configure fencing for the node:
    1. Click the node that you added in the previous step.
    2. At the bottom of the right frame (below Properties), click Manage Fencing For This Node. Clicking Manage Fencing For This Node causes the Fence Configuration dialog box to be displayed.
    3. At the Fence Configuration dialog box, bottom of the right frame (below Properties), click Add a New Fence Level. Clicking Add a New Fence Level causes a fence-level element (for example, Fence-Level-1, Fence-Level-2, and so on) to be displayed below the node in the left frame of the Fence Configuration dialog box.
    4. Click the fence-level element.
    5. At the bottom of the right frame (below Properties), click Add a New Fence to this Level. Clicking Add a New Fence to this Level causes the Fence Properties dialog box to be displayed.
    6. At the Fence Properties dialog box, click the Fence Device Type drop-down box and select the fence device for this node. Also, provide additional information required (for example, Port and Switch for an APC Power Device).
    7. At the Fence Properties dialog box, click OK. Clicking OK causes a fence device element to be displayed below the fence-level element.
    8. To create additional fence devices at this fence level, return to step 6d. Otherwise, proceed to the next step.
    9. To create additional fence levels, return to step 6c. Otherwise, proceed to the next step.
    10. If you have configured all the fence levels and fence devices for this node, click Close.
  7. Choose File => Save to save the changes to the cluster configuration.
To continue configuring a new cluster, proceed to Section 5.6, “Configuring a Failover Domain”.
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