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Create dynamic clusters

Dynamic clusters consist of server instances that can be dynamically scaled up to meet the resource needs of your application. A dynamic cluster uses a single server template to define configuration for a specified number of generated (dynamic) server instances. For more information about server templates, see Create server templates.

When you create a dynamic cluster, the dynamic servers are preconfigured and automatically generated for you, enabling you to easily scale up the number of server instances in your dynamic cluster when you need additional server capacity. For more information, see Dynamic Clusters.

To create a dynamic cluster:

  1. If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit (see Use the Change Center).
  2. In the left pane of the Console, select Environment > Clusters.
  3. In the Clusters table, click New and select Dynamic Cluster.
  4. On the Specify Cluster Identity and Properties page:
    1. In Name, enter a unique name for your new dynamic cluster.
    2. In Messaging Mode, select the messaging mode you want to use for this cluster.
    3. If you are using the unicast messaging mode, enter the unicast broadcast channel in Unicast Broadcast Channel. This channel is used to transmit messages within the cluster. If you do not specify a channel, the default channel is used.
    4. If you are using the multicast messaging mode:

      Enter the multicast address of the new dynamic cluster in Multicast Address. A multicast address is an IP address in the range from to The default value used by WebLogic Server is This address must be unique to this cluster and should not be shared by other applications.

      Enter the multicast port for the new dynamic cluster in Multicast Port. The multicast port is used by cluster members to communicate with each other. Valid values are between 1 and 65535.

  5. Click Next.
  6. On the Specify Dynamic Server Properties page:
    1. In Number of Dynamic Servers, enter the number of server instances you need at peak load.
    2. In Server Name Prefix, specify the naming convention you want to use for the dynamic servers in your cluster.
    3. Select either Create a New Server Template Using Domain Defaults or Clone an Existing Server Template For This Cluster. If you choose to clone an existing template, select the template in Server Template to Clone.

      Server templates are used to configure the characteristics that are common to all the server instances in your dynamic cluster. If you do not have any server templates configured, one is automatically generated for you.

  7. Click Next.
  8. On the Specify Machine Bindings page, select the method you want to use to distribute the dynamic servers in your cluster across machines.
  9. Click Next.
  10. On the Specify Listen Port Bindings page, select how the dynamic servers should be bound to listen ports.
  11. Click Next.
  12. On the Review Your Dynamic Cluster Configuration page, check the configuration details for your new dynamic cluster to make sure they are correct.
  13. Click Finish.
  14. To activate these changes, in the Change Center of the Administration Console, click Activate Changes.
    Not all changes take effect immediately—some require a restart (see Use the Change Center).


The new dynamic cluster appears in the Clusters table. If you did not apply a previously existing server template, a new server template is created and follows the naming convention you specified. A message is displayed confirming that the cluster was created successfully.

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