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7.2.4 Using server groups and clones

7.2.4 Using server groups and clones

A server group is a template for creating copies of an application server instance. The copies are called clones. The act of creating the clones is called cloning.

Cloning allows identical copies of application servers to be created. Server groups and clones can be created only for application servers. A system administrator first creates a server group that represents an application server with the desired properties. From it, one or more clones can be created. The clones represent real application server processes; when first created, they are identical to the model in every way.

Changes to a server group are propagated to its clones when the clones are restarted. You can efficiently administer several copies of a server or other resource by administering its server group.

Working with server groups and clones

The procedure for creating server groups and clones is as follows:

  1. Create the original instance of the application server that you want to clone. Configure it exactly as you would like it.  For example, you can deploy enterprise beans into the application server's container and configure the application server to meet specific performance goals.
  2. Create a server group from the application server by using the Administrative Console.  Making the original instance a clone is recommended but not required. The original instance can remain freestanding.
  3. Create clones of the server group.
  4. When changes are necessary, apply them to the server group, which in turn modifies the original instance (which is now a clone) and the other clones.
Go to previous article: Workload management for administrative servers Go to next article: Cloning for workload management, failover, and scaling

 

 
Go to previous article: Workload management for administrative servers Go to next article: Cloning for workload management, failover, and scaling