A dynamic cluster is a cluster that contains one or more dynamic
servers. A dynamic server is a server instance that has not been
individually configured but instead gets its configuration from a server
template. See Create server
templates. For more information on dynamic clusters, see Creating Dynamic
To create a dynamic
- If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit (see Use the Change Center).
In the left pane
of the Console, select Environment >
Clusters table, click New and select
Specify Cluster Identity and Properties
In Name, enter a unique name for your new dynamic
In Messaging Mode, select the messaging mode you want
to use for this cluster.
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.
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 188.8.131.52 to 184.108.40.206. The default
value used by WebLogic Server is 220.127.116.11. This address must
be unique to this cluster and should not be shared by other
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.
On the Specify Dynamic Server Properties
In Number of Dynamic Servers, enter the number of
servers you need at peak load.
In Server Name Prefix, specify the naming convention
you want to use for the dynamic servers in your cluster.
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.
On the Specify Machine Bindings page, select
the method you want to use to distribute the dynamic servers in your
cluster across machines.
On the Specify Listen Port Bindings page,
select how the dynamic servers should be bound to listen ports.
On the Review Your Cluster Configuration
page, check the configuration details for your new dynamic cluster to
make sure they are correct.
- 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.