Integrating apache tomact with mod_jk

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This tutorial explains how to install and configure web-servers Apache or httpd 2 and tomcat 7 and integrate them with mod_jk or jk_module in Centos operating system. All the traffic to the apache will be redirected to tomcat.

We have one Centos 5.2 32 bit vmware instance
IP : 192.168.137.65
Hostname : modjk.lap.work


Installing Apache:
#yum install httpd*
yum install gcc gcc-cpp gcc-c++
Because you will need httpd-devel for apxs
or
yum install httpd-devel

Start the apache service
/etc/init.d/httpd start
#Chkconfig httpd on

[root@modjk bin]# netstat -ntplau | grep httpd
tcp        0      0 :::80                       :::*                        LISTEN      4948/httpd
[root@modjk bin]#

Installing Tomcat:
First install jdk

#wget http://download.oracle.com/otn-pub/java/jdk/7u3-b04/jdk-7u3-linux-i586.rpm
#rpm -ivh jdk-7u3-linux-i586.rpm
Set the following ernvironment variables:
JAVA_HOME=/usr/java/jdk1.7.0_03
export JAVA_HOME
PATH=$PATH:JAVA_HOME/bin
export PATH
You can add it in /etc/profile for permanent use

Download Tomcat:
#wget http://apache.mesi.com.ar/tomcat/tomcat-7/v7.0.26/bin/apache-tomcat-7.0.26.tar.gz

Untar the package:
tar xvzf apache-tomcat-7.0.26.tar.gz
cd apache-tomcat-7.0.26
cd bin
./startup.sh

[root@modjk bin]# netstat -ntplau
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 0.0.0.0:111                 0.0.0.0:*                   LISTEN      4823/portmap
tcp        0      0 ::ffff:127.0.0.1:8005       :::*                        LISTEN      5251/java
tcp        0      0 :::8009                     :::*                        LISTEN      5251/java
tcp        0      0 :::8080                     :::*                        LISTEN      5251/java
[root@modjk bin]#

Now install jakarta connector:
#wget http://archive.apache.org/dist/jakarta/tomcat-connectors/jk/source/jk-1.2.15/jakarta-tomcat-connectors-1.2.15-src.tar.gz
tar xvzf jakarta-tomcat-connectors-1.2.15-src.tar.gz
cd jakarta-tomcat-connectors-1.2.15-src
cd jk/
cd native/
./configure --with-apxs=/usr/sbin/apxs
make
make install

Add the mod_jk module to httpd configuration file
vi /etc/httpd/conf/httpd.conf
LoadModule jk_module  modules/mod_jk.so
Save the file.

Now retart the apache service
/etc/init.d/httpd restart

Check the mod_jk is loaded
#httpd -M

Create worker.properties file
[root@modjk bin]# cat  /etc/httpd/conf.d/workers.properties
workers.tomcat_home=/usr/local/src/apache-tomcat-7.0.26
workers.java_home=/usr/java/jdk1.7.0_03
ps=/
worker.list=worker1
worker.default.port=8009
worker.default.host=localhost
worker.default.type=ajp13
worker.default.lbfactor=1
[root@modjk bin]#

Create mod_jk.conf (apache conf file for mod_jk)
[root@modjk bin]# cat /etc/httpd/conf.d/mod_jk.conf
# Where to find workers.properties
JkWorkersFile /etc/httpd/conf.d/workers.properties
# Where to put jk logs
JkLogFile /var/log/httpd/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 indicate to send SSL KEY SIZE,
JkOptions +ForwardKeySize +ForwardURICompat -ForwardDirectories
# JkRequestLogFormat set the request format
JkRequestLogFormat "%w %V %T"
# Send servlet for context /examples to worker named worker1
JkMount /examples worker1
# Send JSPs for context /examples/* to worker named worker1
JkMount /examples/* worker1
[root@modjk bin]#

add the following line in /etc/httpd/conf/httpd.conf
Include /etc/httpd/conf.d/mod_jk.conf

Now restart the apache service
/etc/init.d/httpd restart

http://192.168.137.65 - You will get apache default page
http://192.168.137.65:8080 - You will get tomcat default page
http://192.168.137.65/examples - You will get tomcat examples page