Tomcat Clustering

After a long long time search and configuring testing finally i have got a better clustering method which is meet my requirements! i am happy now as it is my long time hunting.... finally it success

i am just posting it here for future myself & if it might help anybody else .

In this cluster i used two tomcat servers & one apache server.
Machines
Apache
IP 192.168.10.100
Tomcat
IP 192.168.10.201
IP 192.168.10.202


Packages that i have installed
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Tomcat: 
tomcat6-servlet-2.5-api-6.0.26-27.fc14.noarch
tomcat6-jsp-2.1-api-6.0.26-27.fc14.noarch
tomcat6-el-2.1-api-6.0.26-27.fc14.noarch
tomcat6-lib-6.0.26-27.fc14.noarch
tomcat6-6.0.26-27.fc14.noarch



HTTPD


httpd-tools-2.2.17-1.fc14.i686
system-config-httpd-1.5.2-2.fc14.noarch
httpd-2.2.17-1.fc14.i686
and mod_jk
from this location
wget http://archive.apache.org/dist/tomcat/tomcat-connectors/jk/binaries/linux/jk-1.2.31/i386/mod_jk-1.2.31-httpd-2.2.x.so
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Configuration Files

Tomcat
/etc/tomcat6/server.xml
/etc/tomcat6/context.xml

HTTPD
/etc/httpd/conf/httpd.conf

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Open the tomcat configuration file (server.xml )
And add the contents like this given below.

vim /etc/tomcat6/server.xml



 
 
 
 
 
 
 
 
 

 

                  type="org.apache.catalina.UserDatabase"
              description="User database that can be updated and saved"
              factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
              pathname="conf/tomcat-users.xml" />
 

 
 
                    connectionTimeout="20000"
               redirectPort="8443" />
 
 
   


       

     
                   resourceName="UserDatabase"/>

   
                  unpackWARs="true" autoDeploy="true"
            xmlValidation="false" xmlNamespaceAware="false">

               
                   directory="logs" prefix="common_access_log."
             suffix=".txt" pattern="common" resolveHosts="false"/>
      

                                  className="org.apache.catalina.ha.tcp.SimpleTcpCluster">
                                                     expireSessionsOnShutdown="false"
                               notifyListenersOnReplication="true"/>
                     
                                                        className="org.apache.catalina.tribes.membership.McastService"
                                  dropTime="3000"
                                  frequency="500"
                                  port="45564"/>
                                                      autoBind="100"         
                                className="org.apache.catalina.tribes.transport.nio.NioReceiver"
                                 maxThreads="6"
                                 port="4000"
                                 selectorTimeout="5000"/>
                    
                        
                    
                    
                    
                    
                                                 filter=""/>
                    
                    
                    

                         tempDir="${catalina.base}/temp/"
                deployDir="${catalina.base}/webapps/"
                watchDir="${catalina.base}/dir/"
                watchEnabled="true"/>

      
     
   
 

:wq!

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In this case what are the apps comes under the webapps that all will be clustered in my case i had only my apps i have removed all default webapps.

Then scp the same file to second tomcat

and then change the followings jvmRoute=www1 to jvmRoute=www2 & watchEnabled="true" to watchEnabled="false"

watchEnabled field will check for the war files under  this "${catalina.base}/dir/"  location and if war file is uploaded it will deploy to the second server when you start the servers so in the second server don't forget to change the value from true to false.

(In my case in both the side i changed it false as i found some session failing error after the testing and i upload the war files manually)
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then next configuration file

vim /etc/tomcat6/context.xml

Add caption

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scp to next host ...
Thats it.....

Now Apache configuration
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add the following on the conf file
vim /etc/httpd/conf/httpd.conf
LoadModule jk_module modules/mod_jk-1.2.31-httpd-2.2.x.so
JkWorkersFile          conf/workers.properties
JkLogFile              logs/jk.log
JkLogLevel             debug
#
JkMount                /*            router
JkMount                /jk_status    status
:wq!
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Then create the file /etc/httpd/conf/workers.properties

vim /etc/httpd/conf/workers.properties
worker.list=router,status

worker.worker1.port=8009
worker.worker1.host=192.168.10.201
worker.worker1.type=ajp13
worker.worker1.lbfactor=1
worker.worker1.local_worker=1
worker.worker1.sticky_session=0

worker.worker2.port=8009
worker.worker2.host=192.168.10.202
worker.worker2.type=ajp13
worker.worker2.lbfactor=1
worker.worker2.local_worker=0
worker.worker2.sticky_session=0

worker.router.type=lb
worker.router.balanced_workers=worker1,worker2
worker.router.local_worker_only=1

worker.status.type=status

 :wq!
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DONE
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Just start all servers and check your apps
check the status by this url
http://192.168.10.100//jk_status
& check the apps by this url 
http://192.168.10.100/apps

Login to your apps and bring down one tomcat similarly the other one also after bring back the first one again


Server.xml 


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