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Configuring mod_jk for apache in Cpanel server ?
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Views: 2082
Votes: 1
Posted: 02 Feb, 2008
by: Majoosh C.
Updated: 02 Feb, 2008
by: Majoosh C.
What is mod_jk?

mod_jk  act as a connector between apache and tomcat. This module handles the communication between apache and tomcat.

Configuring mod_jk for apache in cpanel server 
-------------------------------------------------------------------
mod_jk can be obtained in two formats - source and binary. I prefer using source :)

--------------------------------------------------------------
cd /usr/local/src/
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 -xzf jakarta-tomcat-connectors-1.2.15-src.tar.gz
cd jakarta-tomcat-connectors-1.2.15-src
cd jk/native/
./configure --with-apxs=/usr/local/apache/bin/apxs
make
cd apache-1.3/
cp mod_jk.so.0.0.0 /usr/local/apache/libexec/mod_jk.so
cd ../../conf/
cp workers.properties /usr/local/apache/conf/workers.properties
--------------------------------------------------------------

Now create a file jk.conf in /usr/local/apache/conf/

Edit the file jk.conf and enter this:

----------------------------------------------------------------------------
JkWorkersFile /usr/local/apache/conf/workers.properties
JkLogFile /usr/local/apache/logs/mod_jk.log
JkLogLevel info
JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "
JkOptions +ForwardKeySize +ForwardURICompat -ForwardDirectories
JkRequestLogFormat "%w %V %T"
----------------------------------------------------------------------------

Make sure you you specify the correct path for JkWorkersFile (i.e /usr/local/apache/conf/workers.properties)

Now edit /usr/local/apache/conf/httpd.conf and add this under corresponding section

------------------------------------------------------
Include "/usr/local/apache/conf/jk.conf"
LoadModule      jk_module libexec/mod_jk.so
AddModule mod_jk.c
------------------------------------------------------

Now if you want to add support for jsp files for a domain add the following lines inside the virtual host entry for that domain in   /usr/local/apache/conf/httpd.conf

--------------------------------
JkMount /*.jsp ajp13
JkMount /servlet/* ajp13
--------------------------------


For example:
--------------------------------------------------------------
<VirtualHost 192.168.1.1:80>
    ServerName domain.com
    ServerAlias www.domain.com
    ServerAdmin webmaster@domain.com
    DocumentRoot /home/domain/public_html
    JkMount /*.jsp ajp13
    JkMount /servlet/* ajp13
    BytesLog /usr/local/apache/domlogs/domain.com-bytes_log
    CustomLog /usr/local/apache/domlogs/domain.com combined
    ScriptAlias /cgi-bin/ /home/domain/public_html/cgi-bin/
</VirtualHost>
--------------------------------------------------------------


Edit the file /usr/local/apache/conf/workers.properties

Check the following :

--------------------------------------------------------------------
workers.tomcat_home=/usr/local/tomcat/ ( should be the path to tomcat)
workers.java_home=/usr/local/jdk1.6/jdk ( you will get this path by `echo $JAVA_HOME` )
-------------------------------------------------------------------


Next thing you need to check is need a virtual host entry in the server.xml (tomcat file)

cd /usr/local/tomcat/conf

edit server.xml file and add the following under Virtual Hosts

--------------------------------------------------------------
<Host name="domain.com" appBase="/home/domain/public_html/">
          <Context path="" reloadable="true" docBase="/home/domain/public_html/" debug="1"/>
          <Context path="/manager" debug="0" privileged="true"
              docBase="usr/local/jakarta/tomcat/server/webapps/manager">
          </Context>
</Host>
--------------------------------------------------------------


Now to test if  mod_jk is working properly just put a test jsp page in  /home/domain/public_html/test.jsp and access it via URL http://domain.com/test.jsp

test.jsp code is as below:

--------------------------------------------------------------
<HTML>
  <HEAD>
      <TITLE>Jsp sample page- Hello  </TITLE>
  </HEAD>
    <BODY">
       <P>
       <BR><BR><BR><BR><BR><BR><BR><BR><BR><BR>
       <B><CENTER><FONT COLOR=BLACK SIZE=5>
         <TABLE BORDER BGCOLOR=BLACK>
            <TR>
               <TD ALIGN=CENTER VALIGN=CENTER>
                  <B><FONT COLOR=RED SIZE=5>
                     &nbsp;<% out.println(" Hey it's working!!!"); %> !
                  </B>
               </TD>
            </TR>
         </TABLE>
         </CENTER></B>
       </P>
     </BODY>
</HTML>
--------------------------------------------------------------


That's all ;)
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