oracle weblogic server 12c_ creating a basic cluster

8/4/2015 Oracle WebLogic Server 12c: Creating a Basic Cluster

http://www.oracle.com/webfolder/technetwork/tutorials/obe/fmw/wls/12c/12_1_3/05/05CreateCluster/createcluster.html 1/13

Purpose

This tutorial shows you how to use the Oracle WebLogic Server 12c administration console to configure a basic cluster.

Time to Complete

Approximately 1/2 hour

Introduction

A WebLogic Server cluster consists of multiple managed servers running simultaneously, running the same applications, and working together to provideincreased scalability and reliability. A cluster appears to a client as one WebLogic Server instance. Web application client requests go to the cluster proxy,which passes those requests to one of the servers in the cluster. A cluster proxy can be a web server, a hardware load balancer, or even another instanceof WebLogic Server itself. The managed servers that make up a cluster can run on the same machine or on different machines. For increased reliability,managed servers in a cluster typically run on more than one machine.

This tutorial shows you how to use the Oracle WebLogic Server 12c (12.1.3) administration console to create a basic cluster and add servers to it.Additional tutorials extend this cluster's capabilities to support load balancing and failover of Java Platform, Enterprise Edition applications.

Hardware and Software Requirements

Oracle Linux 5.6+Oracle WebLogic Server 12c (12.1.3)

Prerequisites

Before starting this tutorial, you should have completed the Oracle by Example tutorials titled:

1. Oracle WebLogic Server 12c: Installing WebLogic Server and Creating a Domain2. Oracle WebLogic Server 12c: Configuring Managed Servers

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

Overview

Creating a Cluster of Existing Servers

Oracle WebLogic Server 12c: Creating a Basic Cluster



1. If the administration server of the domain is not already running, start it.

a. Open a Terminal window and navigate to the domain directory. In this tutorial, the domain directory is /scratch/domains/mydomain.

b. In the domain directory, enter the following command: $> ./startWebLogic.sh.

c. At the prompt, enter the credentials of the domain administrator. In this tutorial, the username is weblogic and the password isWelcome1.

Note: The password is not displayed.

2. If any of the managed servers of the domain are running, shut them down.

a. Open a web browser and enter the URL for the administration console: http://hostname:port/console. In this tutorial, the URL ishttp://<ip_address>:7001/console.

Note: Replace <ip_address> with the host name or IP address of your administration server.

b. On the Welcome screen, log in with the username and password that you entered to start the administration server.



c. In the administration console, under Domain Structure, expand Environment, and then click Servers. d. 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. e. At the prompt to confirm the forced shutdown, click Yes, refresh your 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 Channelblank, 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 amanaged 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.

a. Open a Terminal window and navigate to the bin directory under your domain directory. In this tutorial, the domain directory is/scratch/domains/mydomain.

b. Enter the following command: startManagedWebLogic.sh.

This command takes two arguments:

The name of the managed server that you want to startThe URL of the administration server

In this tutorial, those arguments are:

Starting the Clustered Servers



In this tutorial, those arguments are:

server1http://<ip_address>:7001

Note: Replace <ip_address> with the host name or IP address of your administration server.

c. At the prompt for a username and password, enter the credentials of the domain administrator.

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 forcommunication from other cluster members. To ensure that the server starts successfully, wait for the following message: The server startedin RUNNING mode.

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

Monitoring the Cluster



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 informationis also displayed. To see even more information in the table, click the Customize this table link.

Monitoring the Cluster



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.



In this tutorial, you learned how to:

Use the administration console to define a new clusterAdd servers to a cluster

Summary



Add servers to a clusterUse server log messages to confirm a server's participation in a clusterUse the administration console to monitor a cluster

Resources

For documentation on Oracle WebLogic Server 12c (12.1.3), visit the Oracle WebLogic Server Documentation Library.For more information on creating and configuring clusters, see the Create and configure clusters section of the administration console online help.For more information on clusters in general, see the Administering Clusters for Oracle WebLogic Server document.To learn more about Oracle WebLogic Server, refer to additional OBEs in the Oracle Learning Library.

Credits

Lead Curriculum Developer: Bill BellOriginal Oracle by Example tutorial for version 11g created by: TJ PalazzoloOther Contributors: Susan Moxley

http://docs.oracle.com/middleware/1213/wls/WLACH/taskhelp/clusters/ClusterRoadmap.html

http://www.oracle.com/goto/oll

http://docs.oracle.com/middleware/1213/wls/index.html

http://docs.oracle.com/middleware/1213/wls/CLUST/

oracle weblogic server 12c_ creating a basic cluster

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