What is a Cluster?

A cluster is a collection of zero or more server instances that work together as one logical entity. A cluster provides a runtime environment for one or more J2EE applications.

The use of clusters in the Sun Java System Application Server Platform | Enterprise Edition 8 environment provides the following:

A cluster has the following properties:

Every cluster in the domain has a unique name; furthermore, this name must be unique across all node agent names, server instance names, cluster names, and configuration names. The name must not be domain. Administrators perform the same operations on a cluster (for example, deploying applications and creating resources) that they perform on an unclustered server instance.

For an overview of the use of clusters, node agents, and server instances, see the Deployment Planning Guide. For details about the load balancer, see HTTP Load Balancing and Failover.

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