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.
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.
When you are prompted, provide the master password.
The node agent starts and connects with the Domain Administration Server.
If the Domain Administration Server is not running, the node agent might fail to start.