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Web Application Deployment module A655
Using Tomcat and Apache httpd Together
Exercises, examples and other material relating to training module A655. This topic is presented on public courses Deploying Apache and Tomcat, Deploying Java Applications on Linux / Unix

Tomcat's an excellent server, but it doesn't have quite the facilities and acceptance that Apache httpd and Microsoft's IIS have. Fortunately, you can get the best of both Tomcat and another server by running them in careful co-operative co-existence on the same host computer.

Related technical and longer articles
Load balancing and robustness - httpd, tomcat, PHP, Servlets, MySQL
The proxy jServ, jk, jk2, warp and jk story

Articles and tips on this subjectupdated
3999Handling failures / absences of your backend server nicely
It's good for your website to put a professional smile on it's face, even when it's having problems with its backend! On high traffic sites (for example - TV show and news sites), backend servers can occasionally get overloaded and you'll want your web site visitor to get a message to that effect, ...
2013-02-08
 
3018Tuning Apache httpd and Tomcat to work well together
If you're running Tomcat as your servlet / JSP container, you're more than likely to have it (or them - you may have multiple instances) running as application servers behind Apache httpd (the Http server) or behind a pair of Http servers. That just like having a team of people providing a service (let's ...
2010-10-28
(longest)
2482Load balancing with sticky sessions (httpd / Tomcat)
Subject: Load balancing with sticky sessions, using Apache http server (version 2.2.14 in my example) with mod_proxy_balancer as the front end balancer and Apache Tomcat 6.0.20 as the application engine. [[Tip should also work for other recent 2.2.x and 6.0.x versions]] Background When you have too ...
2009-10-30
(longer)
1938Predictive Load Balancing - PHP and / or Java
Load Balancing Algorithms - the standard offerings How do you share out the requests when you're load balancing? The computer (or other device) that's sharing out the load needs to make a decision as to where it should forward each request, and there are a number of different option commonly available. a) ...
2008-12-15
(longer)
1944Forwarding session and cookie requests from httpd to Tomcat
If you're using mod_proxy to forward requests that use sessions to other servers, you need to ensure that the cookies get correctly rewritten as they're sent to the browser for setting, in order to reflect the URL of the customer facing server rather than the back end server. Here's an example where ...
2008-12-15
 
1940URL rewriting with front and back servers
If you ask someone to double a number, they'll come back to you and tell you twice the number you gave them - give the "3" and they'll say "6". But if you tell them to double the number every time they handle it, but refer it to someone else for them to validate it, you'll get "12" back. Since they ...
2008-12-14
 
1771More HowTo diagrams - MySQL, Tomcat and Java
Here are some more diagrams "off the wall" from last week - showing "howto" and "whatis" information for Tomcat, Java and MySQL Some Tomcat and Java Fundamentals On the right of the board ... the main java programs ... • the Java compiler is called javac • the Java Virtual machins is in a ...
2008-08-24
(longest)
576Why run two different web servers
You wouldn't choose to use a Ford Ka as your car for that holiday of a lifetime travelling across Europe, neither would you choose a Jaguar as your idea car for the school run. Yet both of them are perfectly good models of car. Indeed as a family, you might have one of each. Apache httpd and Apache ...
2008-05-04
 
1552Extra public classes in deploying Apache httpd and Tomcat
We have just scheduled an additional two Deploying Apache httpd and Tomcat courses, to start on Monday 3rd and Wednesday 5th March 2008. This course is "flavour of the month" - I ran such a course the week before last, a tailored private course last week ... and I have another public course scheduled ...
2008-02-24
 
1376Choosing between mod_proxy and mod_rewrite
If you're connecting an Apache httpd server to an Apache Tomcat server, you can do so via proxied http requests - i.e. have your customer facing http server relay the request on, perhaps having modified it, to Tomcat and then passing the response back. Two different Apache modules give you the facility ...
2008-02-23
 
1549http, https and ajp - comparison and choice
In a web scenario, client to server traffic is usually carried using an http (HyperText Transfer Protocol) transport. That's both from browser to public facing server, but also in ongoing transfers from the public facing server to other servers which provide content or run business logic in many applications. But ...
2008-02-23
(longer)
1383Monitoring mod_jk and how it is load balancing
Apache httpd with mod_jk has the ability to balance the load forwarded to a number of instances of a Java application running in different Tomcat containers, probably on different host c.p.u.s in most circumstances. I covered this a few days ago - see here for details. But there's a follow up question ...
2007-10-07
 
631Apache httpd to Tomcat - jk v proxy
Many of our customers run both the Apache httpd and Apache Tomcat web servers - with good cause, since Tomcat is biased towards web applications where the same code is run many, many times over and httpd is biased towards serving pages and is better tuned for a much larger number of different pages but ...
2006-06-09
 
436Linking Apache httpd to Apache Tomcat
Current connectors are jk and proxy; jserv, warp and jk2 are deprecated. As well as httpd and Tomcat downloads, you'll need mod_jk and then you'll need to configure it. I've seen some long explanations ... so here's a "bare bones" for the configuration files: Onto the end of httpd.conf: LoadModule ...
2006-06-05
 
Examples from our training material
httpd.forward   Forwarding from http to Tomcat
jkworkers.properties   Configuration file for mod_jk with load balancing
snowdrop.httpd.jk.conf   mod_jk configuration example - balancing and status
Background information
Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from http://www.training-notes.co.uk.
Topics covered in this module
Do I run both Apache httpd and Apache Tomcat?.
Connection options.
Using two separate server daemons on a single host.
Connecting via a proxy from Apache to Tomcat.
Setting up httpd to act as a proxy.
Setting up Tomcat to handle proxied requests from httpd.
Running Tomcat from httpd with jk2 with AJP.
Installing and configuring mod_jk2 in httpd.
Other deprecated connectors.
Complete learning
If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

Well House Consultants specialise in training courses in Linux and LAMP,Python, Perl, PHP, and MySQL. We run Private Courses throughout the UK (and beyond for longer courses), and Public Courses at our training centre in Melksham, Wiltshire, England. It's surprisingly cost effective to come on our public courses - even if you live in a different country or continent to us.

We have a technical library of over 700 books on the subjects on which we teach. These books are available for reference at our training centre. Also available is the Opentalk Forum for discussion of technical questions.


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