JBoss 6 clustering with Apache Modjk [ Load balance ]

Download the software required

  Apache Server :- httpd-2.2.21-win32-x86-no_ssl.msi
  mod_jk :- tomcat-connectors-1.2.32-windows-i386-httpd-2.0.x.zip
  Jboss Application Server :- jboss-as-distribution-6.0.0.Final.zip

  unzip the mod_jk zip file and copy mod_jk.so and paste it under APACHE_HOME/modules/

Configure Apache to load mod_jk

  1)  Modify APACHE_HOME/conf/httpd.conf  and add a single line at the end of the file
   
     # Include mod_jk's specific configuration file 
  Include conf/mod-jk.conf
 

  and modify these line in httpd.conf file

  Listen localhost:80

  ServerName localhost

  
 2) Next, create a new file named APACHE_HOME/conf/mod-jk.conf:

   # Load mod_jk module
 # Specify the filename of the mod_jk lib
 LoadModule jk_module modules/mod_jk.so

 # Where to find workers.properties
 JkWorkersFile conf/workers.properties

 # Where to put jk logs
 JkLogFile logs/mod_jk.log

 # Set the jk log level [debug/error/info]
 JkLogLevel info

 # Select the log format
 JkLogStampFormat  "[%a %b %d %H:%M:%S %Y]"

 # JkOptions indicates to send SSK KEY SIZE
 JkOptions +ForwardKeySize +ForwardURICompat -ForwardDirectories

 # JkRequestLogFormat
 JkRequestLogFormat "%w %V %T"
              
 # Mount your applications
 JkMount /helloworld/* loadbalancer

     (Note :- here you have to give you war file name)

 # You can use external file for mount points.
 # It will be checked for updates each 60 seconds.
 # The format of the file is: /url=worker
 # /examples/*=loadbalancer
 JkMountFile conf/uriworkermap.properties              

 # Add shared memory.
 # This directive is present with 1.2.10 and
 # later versions of mod_jk, and is needed for
 # for load balancing to work properly
 JkShmFile logs/jk.shm
             
 # Add jkstatus for managing runtime data
 
     JkMount status
        Order deny,allow
     Deny from all
     Allow from 127.0.0.1
 

   3) Create a uriworkermap.properties file in the APACHE_HOME/conf directory.
 # Simple worker configuration file
 # Mount the Servlet context to the ajp13 worker
 /jmx-console=loadbalancer
 /jmx-console/*=loadbalancer
 /web-console=loadbalancer
 /web-console/*=loadbalancer
 /helloworld/*=loadbalancer

Configure worker nodes in mod_jk
   4) Next, you need to configure mod_jk workers file conf/workers.properties
 # Define list of workers that will be used
 # for mapping requests
 worker.list=loadbalancer,status
 #worker.list=node1

 # Define Node1
 # modify the host as your host IP or DNS name.
  worker.node1.port=8009
  worker.node1.host=192.168.7.59
  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= 192.168.7.50
  worker.node2.type=ajp13
  worker.node2.lbfactor=1
  worker.node2.cachesize=10

 # Define Node3
 # modify the host as your host IP or DNS name.
  worker.node3.port=8009
  worker.node3.host= 192.168.7.58
  worker.node3.type=ajp13
  worker.node3.lbfactor=1
  worker.node3.cachesize=10

 # Load-balancing behaviour
  worker.loadbalancer.type=lb
  worker.loadbalancer.balance_workers=node1,node2,node3
  worker.loadbalancer.sticky_session=0
  worker.list=loadbalancer

 # Status worker for managing load balancer
  worker.status.type=status

Configuring HTTP session state replication
     1) Enabling session replication in your application
 To enable replication of your web application sessions, you must tag the application as  distributable in the web.xml descriptor(web.xml of your application war file).

<distributable/>
 

Deploy the application in JBoss
 Deploy the application war file in server\all\deploy
Start the Jboss different nodes
 Then run the Jboss in different machines by using command
      run.bat -b -c all -D jboss.messaging.ServerPeerID= -D  jboss.service.binding.set=ports-default

Example
 run.bat -b 192.168.7.59 -c all -D jboss.messaging.ServerPeerID=1 -D  jboss.service.binding.set=ports-default
 run.bat -b 192.168.7.50 -c all -D jboss.messaging.ServerPeerID=2 -D   jboss.service.binding.set=ports-default

Run the application using the URL
 http://localhost/helloworld/hi.jsp