Sun Microsystems 2005Q2 - Manual (Page 12)

In this section you started the Domain Administration Server and confirmed that it is
running. You also logged in to the Admin Console and used the Log Viewer. You can
stop the Quick Start trail here if you do not wish to continue, or you can go on to the
next section.
Creating a Cluster
This section, the second of three basic topics, explains how to create a cluster that
contains two Application Server instances. For simplicity, the cluster runs completely
within one machine. This topic includes the following tasks:
■ “To Start the Node Agent” on page 12
■ “To Create a Cluster” on page 12
▼ To Start the Node Agent
A node agent is a lightweight process running on each machine that participates in an
Application Server administrative domain. The node agent is responsible for starting
and stopping server instances on the host. It also collaborates with the Domain
Administration Server to create new Application Server instances.
One node agent is needed on a machine, for each Application Server administrative
domain that the machine belongs to. If you chose the Node Agent Component during
installation, a default node agent called hostname was created.
1. In a terminal window, type this command:
asadmin start-node-agent hostname
Replace the variable hostname with the name of the host where the Application
Server is running.
2. When you are prompted, provide the master password.
The node agent starts and connects with the Domain Administration Server.
Note – If the Domain Administration Server is not running, the node agent might
fail to start.
▼ To Create a Cluster
A cluster is a group of server instances (typically on multiple hosts) that share the same
configurations, resources, and applications. A cluster facilitates load balancing across
server instances and high availability through failover. You can create clusters
Next Steps
Steps
12 Sun Java System Application Server Enterprise Edition 8.1 2005Q2 Quick Start Guide