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Month: March 2007

Setting up Apache, Tomcat, and mod_jk on RHEL4

I just got through setting up Tomcat5.5, Apache2, and mod_jk on a RedHat Enterprise AS4.4 machine at work. In the past, I have done this by compiling each component separately and fingling with config files until it all worked. But I wanted to stick with RedHat-approved RPM’s from the RedHat network to ease updates and patch management, and to allow the organization to have support options.

I had a lot of trouble finding any documentation on how to do this anywhere, so I thought I’d throw it out here for anyone in a similar situation in search of help.

The following are my notes, sprinkled with a little help I got from a RedHat support tech.

First, I had to enable the following channel within the RedHat Network for this system:

–Red Hat Application Server v. 2 (AS v. 4 for i386)

If you don’t have a RHEL license for updating your system, you will need one.

Once those channels were enabled, I installed the following packages using up2date at the command line:

# up2date tomcat5
# up2date tomcat5-webapps
# up2date tomcat5-admin-webapps
# up2date mod_jk-ap20

With the packages installed, I set out to configure a virtual host to pass requests to Tomcat as needed by using the mod_jk connector. The following steps explain how to do this for a web site called using IP address Substitute your domain and IP accordingly.

Step 1. – Add mod_jk to Apache

In /etc/httpd/conf/httpd.conf add this:

LoadModule jk_module modules/
<ifmodule mod_jk.c>
JkWorkersFile "/etc/httpd/conf/"
JkLogFile "/etc/httpd/logs/mod_jk.log"
JkLogLevel info
JkLogStampFormat "[%a %b %d %H:%M:%S %Y]"

That loads the module into Apache, tells apache where the worker is that will handle jsp/servlets, and tells Apache where to record log entries for mod_jk.

Step 2. – create a new file called /etc/httpd/conf/ and add this to it:


Step 3. Create a virtual host in /etc/httpd/conf/httpd.conf like so:

ServerAdmin [email protected]
DocumentRoot /var/www/html
JkMount /*.jsp ajp13
JkMount /servlet/* ajp13
# Deny direct access to WEB-INF

Step 4. Set up Tomcat5 by adding this to /etc/tomcat5/server.xml just before the very last </Engine> tag at the bottom of the document:

<host name="example" appBase="/var/www/html" unpackWARs="true" autoDeploy="true">
<context path="" docBase="" debug="0" reloadable="true"/>
<valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="web1_access_log." suffix=".txt" pattern="common" resolveHosts="false"/>

Still with me? We are almost done.

Step 6. Create a sample jsp file called /var/www/html/test.jsp and add this to it:

Time: < %= new java.util.Date() %>

Step 7. Start up the services

# apachectl start
# service tomcat5 start

Step 8. Try it!

Browse to

If all went well, you should see the system’s current date and time when you load the web page. Congrats. Hope it works for you!