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|Oracle GlassFish Server 3.1-3.1.1 High Availability Administration Guide|
A named configuration is a set of configuration information for GlassFish Server instances and clusters. A configuration sets port numbers for listeners that an instance or a cluster uses and defines settings for items such as the EJB container, security, logging, and monitoring. Applications and resources are not defined in named configurations.
GlassFish Server enables you to create configurations for use by clusters and instances. GlassFish Server creates configurations automatically for clusters and instances that do not reference an existing configuration. You can modify any existing named configuration regardless of how the configuration was created.
The following topics are addressed here: