Testing cluster with three computers in JBOSS

First we have to create a cluster with three nodes. One node means one machine. That all three computers should be jboss installed. Then we need to start jboss with all configuration and bind with computer IP address. Therefore open the command prompt and go to the jboss bin directory. Then run following command.

Run.bat –c all –b 192.168.1.140 –Djboss.messaging.ServerPeerID=1

This serverPeerId should be unique within a cluster. Since we have three computers in our cluster, we need to start jboss with different peerIDs and corresponding IP’s by running above code.

Now we have created a cluster. Then we need to create a load balancer. So we need to install apache http server on one of above three machine or separate machine. We need not to install apache on every computers.

Go to the following link to download apache http server. Then download and install win32 MSI installer.  It is better not to install inside program files. Because the is a space between “Program file” directory. So in could be a problem. So create a new folder called apache inside C drive and install into that folder.

http://httpd.apache.org/download.cgi#apache22

We are going to use mod_jk.so connecter for load balancing. We have to download mod_jk.so file from following link.

http://www.alliedquotes.com/mirrors/apache//tomcat/tomcat-connectors/jk/binaries/windows/

you need to download tomcat-connectors-1.2.37-windows-i386-httpd-2.2.x.zip. Because we used apache 2.2.22. 

Then unzip the downloaded file and copy that mod_jk.so file into modules folder inside apache installed directory.

Then go to the apache conf folder. Now create a file called mod_jk.conf and add following code to that file.

LoadModule jk_module modules/mod_jk.so

JkWorkersFile conf/workers.properties

JkShmFile logs/mod_jk.shm

JkLogFile logs/mod_jk.log

JkLogLevel info

JkMount /FarmTest-war/* loadbalancer

Most important part of above code is jkMount part. /FarmTest-war/* is the URL pattern of the clustered resource. So you need to specify your clustered resource here.

Then create another file called workers.properties inside the conf folder. This is the file that we specify cluster details. Add following code to that file.

# Define list of workers that will be used

     # for mapping requests

       worker.list=loadbalancer,status

     # Define Node1

     # modify the host as your host IP or DNS name.

       worker.node1.port=8009

    worker.node1.host=192.168.1.140

      worker.node1.type=ajp13

      worker.node1.lbfactor=1

       worker.node1.cachesize=10

     # Define Node2

     # modify the host as your host IP or DNS name.

       worker.node2.port=8009

       worker.node2.host= 192.168.1.141

       worker.node2.type=ajp13

       worker.node2.lbfactor=1

       worker.node2.cachesize=10

 #define node3

worker.node3.port=8009

       worker.node3.host=192.168.1.142

       worker.node3.type=ajp13

       worker.node3.lbfactor=1

      #worker.node1.local_worker=1 (1)

       worker.node3.cachesize=10

           

     # Load-balancing behavior

       worker.loadbalancer.type=lb

       worker.loadbalancer.balance_workers=node1,node2,node3

       worker.loadbalancer.sticky_session=1

Then open the httpd.conf file which located inside the conf folder. Then add following line of code to the bottom of that file.

Include conf/mod_jk.conf

Now restart the apache server.

Then start all jboss nodes.

We have created a load balancer and cluster with three nodes. Now we need to deploy an application to the cluster.  Create a small enterprise application and deploy it with one machine. Then go to the deploy folder inside the “all” folder. Now copy the application “war” file and paste it to the farm folder inside the “all” folder.

Now we deployed an application to the cluster. Now open a web browser and go to following link.

http://192.168.1.140/FarmTest-war/yourServler

This IP address is the IP address of apache installed computer.