Machines

A machine is a logical representation of the physical machine (computer) that hosts one or more WebLogic Server instances.

If you run Node Manager on a machine that does not host an Administration Server, as is typical in production environments, you must create a machine configuration for each computer that runs a Node Manager process. The machine configuration includes information about the listen address and port number that the Administration Server uses to connect with the Node Manager process running on that machine.

In a cluster, WebLogic Server uses machines to ensure that server session data is replicated on separate pieces of hardware.

If the computer runs a UNIX operating system, you can create a UNIX machine configuration, which enables you to assign the process under which a WebLogic Server instance runs to a user ID (UID) or group ID (GID). The WebLogic Server process is assigned (bound) to the UID or GID after the computer has carried out all privledged startup actions.

 

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Tasks

Configuring a Machine

1. Click the Machines node. The Machines table displays in the right pane showing all the machines defined in the domain.
2. Click the Configure a New Machine link (or, if you are configuring a UNIX machine, click the Configure a New Unix Machine link). A dialog displays in the right pane showing the tabs associated with the new machine.
3. Enter a name for the new machine in the Name attribute field. This name is used to identify the machine within the WebLogic Server domain; it does not have to correspond to the machine's network name.
4. If you are creating a UNIX machine and you want to bind the processes under which WebLogic Server instances run to a user ID or group ID, do any of the following:
   • To bind the server processes to a user ID, select Enable Post-Bind UID and enter the user ID in the Post-Bind UID box.
   • To bind the server processes to a group ID, select Enable Post-Bind GID and enter the group ID in the Post-Bind GID box.
5. Click Create to create a machine instance with the name you specified. The new instance is added to the Machines node in the left pane.
6. Click the Node Manager tab to define the Node Manager connection and authentication attributes for the machine.

   Enter the DNS name or IP address upon which Node Manager listens in the Listen Address box. If you identify the Listen Address by IP address, you must disable Host Name Verification on Administration Servers that will access Node Manager. For more information and instructions, see "Using a Hostname Verifier" in Managing WebLogic Security.

   Click Apply to apply your changes.

7. Click the Servers tab to identify which Managed Servers reside on this machine. To assign an existing server to this machine, select the server name in the Available column, and click the appropriate arrow to move the server to the Chosen column.
8. Click Apply to apply your changes. The new machine entry now specifies the attributes required to connect to the Node Manager process running on the machine, as well as identify which WebLogic Server instances reside on the machine.

Cloning a Machine

1. Click the Machines node. The Machines table displays in the right pane showing all the machines defined in the domain.
2. Click the Clone icon in the row of the machine you want to clone. A dialog displays in the right pane showing the tabs associated with cloning a machine.
3. Enter a name for the new machine in the Name attribute field.
4. Click Clone to create a machine instance with the name you specified in the Name field. The new instance is added under the Machines node in the left pane.
5. Click the Node Manager tab and modify the connection information as needed.
6. Click the Servers tab and modify the list of servers that this machine hosts.
7. Click Apply to save the changes.

Deleting a Machine

1. Click the Machines node. The Machines table displays in the right pane showing all the machines defined in the domain.
2. Click the Delete icon in the row of the machine you want to delete. A dialog displays in the right pane asking you to confirm your deletion request.
3. Click Yes to delete the machine. The machine instance is deleted from the Machines node in the left pane.

Assign a WebLogic Server Instance to a Machine

1. Click the instance node in the left pane under Machines for the machine that host the WebLogic Server instance. A dialog displays in the right pane showing the tabs associated with this instance.
2. Click the Servers Tab in the right pane.
3. Select a server from the Available box.
4. Click the right arrow to move the server to the Chosen box.
5. Click Apply.