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7: Multimachine management >
7.2 Managing workloads >
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:
- 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.
- 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.
- Create clones of the server group.
- 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.
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Related topics |
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| Home (Getting started page) |
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| 6.6.22 Administering server groups |
Sub-topics |
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| 7.2.4.1 Cloning for workload management, failover, and scaling |
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| 7.2.4.2 Modifying server groups and clones |
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| 7.2.4.3 Advice for cloning |
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| 7.2.4.4 Containment relationships |
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| 7.2.4.5 Server selection policies and transaction affinity |
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| 7.2.4.6 Security for cloned resources |
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| 7.2.4.7: Creating clones on machines with different WebSphere installation directories or operating systems |
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Peer topics |
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| 7.2.1 Workload management for enterprise beans and application servers |
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| 7.2.3 Workload management for administrative servers |
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| 7.2.5 Using workload management - a sample procedure |
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| 7.2.6 Tuning a workload management configuration |
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| 7.2.7 Run-time exceptions and failover strategies for workload management |
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| 7.2.8 Workload management for stand-alone Java clients |
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