Apache Tomcat Clustering
Apache 2 Configuration
Download mod_jk.so file for Apache 2 and put the file in the modules(\Program Files (x86)\Apache
Software Foundation\Apache2.2\modules)
folder of Apache 2.
Edit httpd.conf file (Apache/conf) and at the very end of the file include mod-jk.conf which
is located.
Include conf/mod-jk.conf
Add mod-jk.conf and workers.properties file conf folder of Apache 2.
mod-jk.conf
######## JkModule ########
LoadModule jk_module modules/mod_jk.so
######## Set JKWorker File ########
JkWorkersFile "C:\Program Files (x86)\Apache Software Foundation\Apache2.2\conf\workers.properties"
# Where to put jk logs
JkShmFile logs/mod_jk.shm
# Shared Memory File
JkLogFile logs/mod_jk.log
# Set the jk log level [debug/error/info]
JkLogLevel info
JkLogStampFormat "[%a %b %d %H:%M:%S %Y]"
# Mount point from context to a Tomcat worker
JkMount /jsp-examples loadbalancer
JkMount /jsp-examples/* loadbalancer
Add workers.properties file in conf folder of Apache 2.
workers.perporties
# workers.properties.minimal -
#
# This file provides minimal jk configuration properties needed to
# connect to Tomcat.
#
# The workers that jk should create and work with
worker. list=loadbalancer
# loadbalancer
#####################
# apache-tomcat-6.1.28 for session replication
worker. Tomcat1.port=8109
worker. Tomcat1.host=10.254.0.117
worker. Tomcat1.type=ajp13
worker. Tomcat1.lbfactor=100
# apache-tomcat-6.2.28 for session replication
worker. Tomcat2.port=8209
worker. Tomcat2.host=10.254.0.117
worker. Tomcat2.type=ajp13
worker. Tomcat2.lbfactor=1
# Loadbalancing behaviour
worker.loadbalancer.type=lb
#LB for session replication
worker.loadbalancer.balanced_workers=one,two
#Sticky Bit
worker.loadbalancer.sticky_session=1
Port number for each tomcat worker should match with respective AJP port number in
server.xml file for each tomcat instance.
Add index.jsp page in jsp-examples folder of WEB-APP/ROOT in
both the Tomcats (Tomcat1 & Tomcat2).
Tomcat 1 : index.jsp
<%@ page session="true" %>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head><title>Test Jsp</title></head>
<body>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr bgcolor="red"><td align="left" width="13%">Tomcat 1 Machine</td>
<td width="87%"> </td></tr>
<tr><td>Session ID : </td>
<td><%=session.getId()%></td>
</tr>
</table>
</body>
<html>
Tomcat 2 : index.jsp
<%@ page session="true" %>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head><title>Test JSP</title></head>
<body>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr bgcolor="green"><td width="13%">Tomcat 2 Machine</td>
<td width="87%">&nbsb;</td>
<tr><td> Session Id : </td><td><%=session.getId()%></td></tr>
</table>
</body>
</html>
Start the Apache 2 server and Tomcat 1 and verify the clustering example on port 81.
http://localhost:81/jsp-examples/index.jsp
Stop Tomcat 1 and start Tomcat 2 with Apache 2 server.
http://localhost:81/jsp-example/index.jsp
Apache 2 Configuration
Download mod_jk.so file for Apache 2 and put the file in the modules(\Program Files (x86)\Apache
Software Foundation\Apache2.2\modules)
folder of Apache 2.
Edit httpd.conf file (Apache/conf) and at the very end of the file include mod-jk.conf which
is located.
Include conf/mod-jk.conf
Add mod-jk.conf and workers.properties file conf folder of Apache 2.
mod-jk.conf
######## JkModule ########
LoadModule jk_module modules/mod_jk.so
######## Set JKWorker File ########
JkWorkersFile "C:\Program Files (x86)\Apache Software Foundation\Apache2.2\conf\workers.properties"
# Where to put jk logs
JkShmFile logs/mod_jk.shm
# Shared Memory File
JkLogFile logs/mod_jk.log
# Set the jk log level [debug/error/info]
JkLogLevel info
JkLogStampFormat "[%a %b %d %H:%M:%S %Y]"
# Mount point from context to a Tomcat worker
JkMount /jsp-examples loadbalancer
JkMount /jsp-examples/* loadbalancer
Add workers.properties file in conf folder of Apache 2.
workers.perporties
# workers.properties.minimal -
#
# This file provides minimal jk configuration properties needed to
# connect to Tomcat.
#
# The workers that jk should create and work with
worker. list=loadbalancer
# loadbalancer
#####################
# apache-tomcat-6.1.28 for session replication
worker. Tomcat1.port=8109
worker. Tomcat1.host=10.254.0.117
worker. Tomcat1.type=ajp13
worker. Tomcat1.lbfactor=100
# apache-tomcat-6.2.28 for session replication
worker. Tomcat2.port=8209
worker. Tomcat2.host=10.254.0.117
worker. Tomcat2.type=ajp13
worker. Tomcat2.lbfactor=1
# Loadbalancing behaviour
worker.loadbalancer.type=lb
#LB for session replication
worker.loadbalancer.balanced_workers=one,two
#Sticky Bit
worker.loadbalancer.sticky_session=1
Port number for each tomcat worker should match with respective AJP port number in
server.xml file for each tomcat instance.
Add index.jsp page in jsp-examples folder of WEB-APP/ROOT in
both the Tomcats (Tomcat1 & Tomcat2).
Tomcat 1 : index.jsp
<%@ page session="true" %>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head><title>Test Jsp</title></head>
<body>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr bgcolor="red"><td align="left" width="13%">Tomcat 1 Machine</td>
<td width="87%"> </td></tr>
<tr><td>Session ID : </td>
<td><%=session.getId()%></td>
</tr>
</table>
</body>
<html>
Tomcat 2 : index.jsp
<%@ page session="true" %>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head><title>Test JSP</title></head>
<body>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr bgcolor="green"><td width="13%">Tomcat 2 Machine</td>
<td width="87%">&nbsb;</td>
<tr><td> Session Id : </td><td><%=session.getId()%></td></tr>
</table>
</body>
</html>
Start the Apache 2 server and Tomcat 1 and verify the clustering example on port 81.
http://localhost:81/jsp-examples/index.jsp
http://localhost:81/jsp-example/index.jsp
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