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 example.com using IP address 220.127.116.11. 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/mod_jk.so
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/workers.properties and add this to it:
Step 3. Create a virtual host in /etc/httpd/conf/httpd.conf like so:
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 http://www.example.com/test.jsp
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!
I may be the only one needing this exact information! I have about half of the steps complete so far…I’ll knock out the rest Monday morning….and stuff.
Thanks for sharing this information – I found it really helpful. By the way, for RHEL ES 4.4 have a look at JPackage 1.7b (http://www.jpackage.org/jppfaq.php) … The only thing you need in addition to JPackage is the RHEL ES 4.4 Extras Channel and the eclipse-ecj package from ftp://ftp.redhat.com/pub/redhat/linux/enterprise/4/en/RHDS3/i386/RPMS/eclipse-ecj-3.2.0-1jpp_2rh.i386.rpm
By the way, the Spam Protection/Captcha (Please add x and y) is not very useful when an input error (after submitting the form) throws away everything you typed … shouldn’t it display an error and (!) the whole form again, including previous content, not just a “please go back” message 🙁
I’ll take a look at that, Andreas.
Thanks for reminding me to disable the captcha thing – I meant to do that earlier!
i’ve installed a new comment spam prevention method. this comment is a test of that plugin.
Thanks for the info! Looks to me like the ‘Red Hat Application Server v. 2’ channel is the one that contains the tomcat5 package.
woa! i almost forgot how long it took to complete a tomcat install in the past. i just setup recently a tomcat5.0 on a rhel5 box with apache and j1.4.x. i was pleased to discover that the apache to tomcat connection part was just a single line in a file that already exists on the system – /etc/httpd/conf.d/proxy_ajp.conf (ofcourse, assuming you already have apache and jre and tomcat running)
Thanks for sharing. I’ve got Tomcat up and running in no time!
DUDE, the jsp code is bad! I pulled my hair out trying to figure this out and it turns out the jsp code you listed has a white space that shouldn’t be there. =)
Don’t get me wrong, I really appreciate the tutorial, it was spot on. Thanks for that. I’m finally glad I’ve got this god forsaken language working on my rhel5 server. Thanks again!