Oracle WebLogic Server 12c (12.2.1): Creating a Basic Cluster

Purpose

Time to Complete

Background

What Do You Need?

To create a cluster of existing managed servers, perform the following steps:

1. If the administration server of the domain is not already running, start it.
   1. Open a Terminal window and navigate to the domain directory. In this tutorial, the domain directory is /scratch/u01/app/fmw/user_projects/domains/mydomain.
   2. In the domain directory, enter the following command: ./startWebLogic.sh

      

   3. At the prompt, enter the credentials of the domain administrator. In this tutorial, the username is weblogic and the password is welcome1.
      Note: The password is not displayed.

      

      
      

      Wait until the administration server is running before continuing.

2. If any of the managed servers of the domain are running, shut them down. (You cannot change the machine of a running server.)
   
   1. Open a web browser and enter the following URL for the administration console: http://hostname:port/console
      In this tutorial, the URL is http://<ip_address>:7001/console. Replace <ip_address> with the host name or IP address of your administration server.
   2. On the Welcome screen, log in with the username and password that you entered to start the administration server.

      

   3. In the administration console, under Domain Structure, expand Environment, and then click Servers.

      

   4. On the Control tab, under Summary of Servers, select the check box for each running managed server, and then select Force Shutdown Now from the Shutdown list.

      

   5. At the prompt, click Yes, refresh the browser, and ensure that all managed servers show the SHUTDOWN state.

      

3. Creating a cluster is a change to the domain's configuration, so you must first lock the configuration. In the Change Center, click Lock & Edit.

   

4. Under Domain Structure, expand Environment, click Clusters, and then select Cluster from the New list above the Clusters table.

   

5. On the Create a New Cluster page, enter cluster1 for the name, select Unicast for the messaging mode, leave Unicast Broadcast Channel blank, and then click OK.
   Note: Because Unicast is selected, the two Multicast fields are disabled.

   

   
   

   A message indicates that the cluster was created successfully.

6. In the Clusters table, click cluster1 (the name of the new cluster). In "Settings for cluster1," click the Configuration tab and the Servers subtab, and then click Add in the Servers table.

   

7. On the Add a Server to Cluster page, ensure that Select an existing server, and add it as a member of this cluster is selected, select a managed server, and then click Finish.

   

8. Repeat step 7 to add the two remaining managed servers to the cluster.

   

9. In the Change Center, click Activate Changes.

   

   
   

   The following message is displayed: "All changes have been activated. No restarts are necessary."

To start the managed servers that are now part of a cluster, perform the following steps:

1. Start server1.
   1. Open a Terminal window and navigate to the bin directory under your domain directory. In this tutorial, the domain directory is /scratch/u01/app/fmw/user_projects/domains/mydomain.
      
      Enter the following command: startManagedWebLogic.sh.
      This command takes two arguments:
      
      • The name of the managed server that you want to start
      • The URL of the administration server
      
      In this tutorial, those arguments are:
      
      • server1
      • http://<hostname>:7001
        Note: Replace <hostname> with the host name or IP address of your administration server.

        

   2. At the prompt, enter the administrator username and password.
      Note:The password is not displayed.

      

2. In the Terminal window, look for messages from the <Cluster> subsystem, and notice the message that indicates the server is listening for communication from other cluster members. To ensure that the server starts successfully, wait for the following message: The server started in RUNNING mode. This message means that the server is up and running.

   

3. In two other Terminal windows, repeat steps 1 and 2 to start the server2 and server3 managed servers.

   

To monitor the cluster by using the WebLogic Server administration console, perform the following steps:

1. In the administration console, under Domain Structure, expand Environment, click Clusters, and then click cluster1 in the Clusters table.

   

2. Under "Settings for cluster1," click the Monitoring tab and the Summary subtab.

   

3. The table under the Summary subtab indicates that all three managed servers are currently participating in the cluster. Other cluster information is also displayed. To see even more information in the table, click the Customize this table link.

   

4. In the Available area, select columns of interest, click the right arrow to add them to the Chosen area, and then click Apply.
   You can also move columns that do not interest you from Chosen to Available.

   

• For documentation on Oracle WebLogic Server 12c (12.2.1), visit the Oracle WebLogic Server Documentation Library.

• See "Understanding Managed Servers and Managed Server Clusters" in Understanding Oracle Fusion Middleware for more information on clusters.

• To learn more about Oracle WebLogic Server, refer to additional OBEs in the Oracle Learning Library

• Lead Curriculum Developer: Tom Eliason
• Original Oracle by Example tutorial for version 12c created by: Bill Bell
• Original Oracle by Example tutorial for version 11g created by: TJ Palazzolo
• Other Contributors: Veerabhadra Rao Putrevu, Susan Moxley

Version

• 01-15-001-CreatingaBasicCluster