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1 November 2010

Configuring and Testing a WebLogic Cluster

1. Introduction

High availability and load balancing underpin most Java Enterprise architectures and deliver the performance, reliability and scalabilitythat businesses require to maintain competiveness and meet customer expectations. Modern application servers such as WebLogic 10have the capability to automatically migrate services between nodes, monitor their own health and guard against server overload.Theseadvanced features are all underpinned by clustes which we will examine in this article.

2. Architecture Overview

A typical WebLogic architecture to deliver web based services is shown below.

We can see the demilitarized zone (DMZ) employed to add additional perimeter security also containing the Apache load balancing plug-in. The WebLogic cluster is located behind a second firewall typically configured to carefully restrict inbound traffic to certain source andcontent types.

Configuring and Testing a WebLogic Cluster: This article describes how to configure and test a cluster of servers using WebLogic 10.3 andApache 2.2. The cluster w ill use in memory HTTP session replication and demonstrate how server failures can be transparent to end users.

This article is based on the C2B2 WebLogic 10 System Administrator training please contact us for further information.

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In this article we will focus on configuring Apache and WebLogic and the diagram below shows the design we will be building.

It comprises:

2 x managed servers called Server1 and Server2

1 x WebLogic machines called VM1

1 x Apache mod_wl plug-in

1 x c luster called example-cluster

1 x domain called base_domain

The software we will use is:

Centos 5.5

WebLogic 10.3.3

Apache 2.2

C2B2 ClusterTest application

If you would like to build this environment yourself see the resources at the end for links to available software.We assume that you have already:

1. Installed WebLogic to /home/weblogic on RHEL 5 32bit or similar (e.g. Centos 5)

2. Installed Apache

3. Created an administration server on http://wlstrain:7001

4. Created a managed server called Server1 on machine VM1

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1. Configure Apache to proxy requests to the WebLogic c luster

2. Create a managed server called Server2 and assign it to machine VM2

3. Create a c luster called examples-cluster

4. Configuring Apache

3. Configuration Procedure3.1 Install the WebLogic Apache Plug-in and configure basic proxying

Before getting into the configuration you might find the following directory locations useful.

Directory Description

/etc/httpd/modules Apache Modules

/var/log/httpd/ Root of log files

/etc/httpd Root of configuration files

1. Log in as root2. Install the Apache HTTP Server Plug-In module by copying the mod_wl_22.so file to the Apache modules directory

3. Edit the httpd.conf fileAdd at the end of the other module definitions:

LoadModule weblogic_module modules/mod_wl_22.so

apache config 1

4. Test the configuration

In the steps below we will:

cd /home/weblogic/Oracle/Middleware/wlserver_10.3/server/plugin/linux/i686

cp mod_wl_22.so /etc/httpd/modules

cd /etc/httpd/modules

chmod 755 mod_wl_22.so

ls –al (check all the permissions on mod_wl_22.so match the other .so files)

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6. Check that basic proxying worksMake sure the WebLogic administration server is running and point a browser at http://wlstrain/console.You should see the administration console because Apache is proxying requests from the standard HTTP port of 80 (not shown) to thedefault WebLogic administration port of 7001.

[root@localhost ~]# /usr/sbin/apachectl -t

Syntax OK

You should see no errors reported.5. Start Apache and check you can access the home page

/usr/sbin/apachectl start

Go to http://wlstrain (or localhost if you are accessing locally). You should see the page below.

DisclaimerThe views and opinions expressed onthis b log are those of the authors and donot necessarily represent the views andopinions of C2B2 Consulting Ltd.

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3.2. Configure WebLogic and Create a Cluster

Now let's configure WebLogic and create a cluster with two servers: the existing Server1 and a new one called Server2 which we willcreate.1. Login to the Administration console at http://wlstrain:7001/console/2. Create a new managed server and cluster

Go to Environment --> Servers --> Click New and create a new server using:

Server Name=Server2

Listen Port=8002

Cluster Name=examples-cluster

Name the cluster example-cluster.

Make sure you select 'Yes, create a new cluster for this server'

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Click Finish and view the newly created Server2 as part of example-cluster.

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to finish off the cluster we need to add Server2 to machine VM1 and Server1 to example-cluster. Let's update the machinefirst.

4. Updated Machine VM1 configuration and add Server2.

Go to Environment --> Machines

Select machine VM1 then the Servers tab.

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Click Next.

Click on Add and select Server2 as below.

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theServers tab. Youshould see thepage below.

3. Add Server1 to example-cluster.

Go to Environment --> Clusters

Click on example-cluster then on

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.Click Add and select Server1 as below

Click Next to complete and view the configuration.

Go to Environment --> Clusters tocheck.

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3.2. ConfigureApache to Proxy allJSP Requests andTest

We have proved thatthe proxyconfiguration canpass throughrequests to a singleIP address or a allrequests we nowneed to update this toproxy all JSPrequests to our newlycreated cluster.1. Update thehttpd.confEdit httpd.conf andremove (or comment

out) the previous configuration. Add the configuration below. It must be placed below the modules definition.

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apache config 2

install cluster test

4. Testing

2. Start both managed servers : Server1 and Server2. You can either use Node Manager or startup scripts.

3. Install ClusterTest.war and target example-cluster as below.

We now have two servers in a cluster proxied through Apache. Let's test and see what happens when one of the servers fails.

First directly to the ClusterTest application on Server 1 at http://wlstrain:8001/ClusterTest/Session.jsp.

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First directly to the ClusterTest application on Server 1 at http://wlstrain:8001/ClusterTest/Session.jsp.

server test 1

Then we can try Server2 at http://wlstrain:8002/ClusterTest/Session.jsp

server test 2

Now we can try the Apache proxy address at http://wlstrain/ClusterTest/Session.jsp.

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Posted by C2B2 at 00:47

Labels: Apache 2.2. , Configuring a WebLogic Cluster , Testing a WebLogic Cluster , w eblogic , WebLogic 10.3 , w eblogic cluster

cluster test

We can now add values into the HTTP Session using the Cluster Test applicaton and watch them being replicated to all servers in thecluster.We can also stop servers and see how that simulated failure is completely transparent to the user.

5. Conclusion

In this article we stepped through the configuration of WebLogic and Apache to create a basic cluster which demonstrated how a servicecan transparently failover from one server to another. However, we have only scratched the surface of the configuration required to build afast and reliable application infrastructure.

Understanding how clusters operate for EJB clients, how to a configure JDBC multi data source, the pros and cons of in memory versusJDBC state replication and cluster tuning best practices are all aspects which should be considered.

Now we can try the Apache proxy address at http://wlstrain/ClusterTest/Session.jsp.

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2 comments :

Leo 26 December 2012 11:12

The httpd.conf ??

Reply

C2B2 27 January 2013 20:03

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hmm this is an old post and some of the images seem to have disappeared from blogger. Try this post which is newer

http://blog.c2b2.co.uk/2012/10/basic-clustering-with-weblogic-12c-and.html

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