Load Balancing JBoss App Server with Apache using mod_jk

apache-2.2jbossload balancing

I am trying to set up a JBoss Cluster with Apache Load Balancing. But when I type localhost in my browser it should get redirected (proxied?) to port 8080 (JBoss) but it is not getting redirected.

Here's my environment setup:

Ubuntu 11.04
JBoss AS 5.1-GA
Apache 2
mod_jk 1.2.30

My setup looks something like the following:

Apache Web Server: 192.168.1.12:80 - lb1
JBoss App Server 1: 192.168.1.12:8080 - app1
JBoss App Server 2: 192.168.1.23:8080 - app2

My loadbalancer and JBoss1 is on the same machine. (I even tried keeping it on two different machines).

I have copied the mod_jk.so file into /usr/lib/apache2/modules/mod_jk.so, and executed the following steps:

  1. Now execute the following # echo LoadModule jk_module /usr/lib/apache2/modules/mod_jk.so" > /etc/apache2/mods-available/jk.load
  2. And # touch /etc/apache2/mods-available/jk.conf
  3. And # touch /etc/apache2/workers.conf
  4. # a2enmod jk

I have created the file /etc/apache2/workers.conf in the lb1 machine

# Defining the workers list:
worker.list=loadbalancer,status
# first worker properties, we use the AJB13 connection type:
worker.worker1.type=ajp13
worker.worker1.connection_pool_size=20
worker.worker1.host=192.168.1.12
worker.worker1.port=8080
worker.worker1.lbfactor=1
# second worker properties, we use the AJB13 connection type:
worker.worker2.type=ajp13
worker.worker2.connection_pool_size=20
worker.worker2.host=192.168.1.23
worker.worker2.port=8080
worker.worker2.lbfactor=1
# No we set the load balancing config
worker.loadbalancer.type=lb
worker.loadbalancer.sticky_session=true
worker.loadbalancer.balance_workers=worker1,worker2
worker.status.type=status

And I have created the file /etc/apache2/mods-available/jk.conf:

<IfModule mod_jk.c>
# The Jk shared mem location
JkShmFile /var/log/apache2/mod_jk.shm

# Jk logs
JkLogFile /var/log/apache2/mod_jk.log
# Jk loglevel
JkLogLevel info
# Jk logformat
JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "

# Our workers config
JkWorkersFile /etc/apache2/workers.conf

# The most important:
# We will send eveything (/*) to our loadbalancer (set in JkWorkersFile)
JkMount /* loadbalancer
</IfModule>

I changed the serve.xml file of my JBoss:

<Connector port="8009" address="${jboss.bind.address}"
emptySessionPath="true" enableLookups="false" redirectPort="8443" 
protocol="AJP/1.3" connectionTimeout="600000" maxThreads="200"/>

I checked the log files it says mod_jk is initialized.

But its not getting redirected to 8080 port of jboss.

Thanks in Advance.

This my mod_jk.log file 

  [Tue Jul 19 13:17:23 2011] [5505:3079493376] [info] init_jk::mod_jk.c (3183):       
  mod_jk/1.2.28 initialized
  [Tue Jul 19 13:17:23 2011] [5506:3079493376] [info] init_jk::mod_jk.c (3183):    
  mod_jk/1.2.28 initialized

and error.log file of apache

  [Tue Jul 19 13:17:23 2011] [notice] Apache/2.2.17 (Ubuntu) mod_jk/1.2.28 configured --      
  resuming normal operations
  [Tue Jul 19 13:22:13 2011] [error] [client 192.168.1.12] File does not exist:   
  /var/www/favicon.ico

Best Answer

I see such potential errors:

  1. Base on workers.conf file you want to connect on port 8080 using AJP protocol. If you want use AJP you should use such definition (look at port definition):

    worker.worker1.type=ajp13
worker.worker1.connection_pool_size=20
worker.worker1.host=192.168.1.12
worker.worker1.port=8009
worker.worker1.lbfactor=1

  2. There is lack of definition in Engine tag in server.xml file. On each server you should define jvmRoute parameter - base on your workrs.conf file: 

    <Engine name="jboss.web" defaultHost="localhost" jvmRoute="worker1">

    You can find more info here: http://tomcat.apache.org/tomcat-5.5-doc/config/engine.html

  3. How dou you run your JBoss? By default JBoss listine only on localhost. you can check it using netstat:

    netstat -ltnp

    You can also run JBoss with -b parameter:

    run.sh -b 192.168.1.12
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