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|Oracle GlassFish Server 3.1-3.1.1 High Availability Administration Guide|
GlassFish Server uses secure shell (SSH) to ensure that clusters that span multiple hosts can be administered centrally. To perform administrative operations on GlassFish Server instances that are remote from the domain administration server (DAS), the DAS must be able to communicate with those instances. If an instance is running, the DAS connects to the running instance directly. For example, when you deploy an application to an instance, the DAS connects to the instance and deploys the application to the instance.
However, the DAS cannot connect to an instance to perform operations on an instance that is not running, such as creating or starting the instance. For these operations, the DAS uses SSH to contact a remote host and administer instances there. SSH provides confidentiality and security for data that is exchanged between the DAS and remote hosts.
Note - The use of SSH to enable centralized administration of remote instances is optional. If the use of SSH is not feasible in your environment, you can administer remote instances locally.
The following topics are addressed here: