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For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))

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Web Application Deployment module A657
Using httpd to front Tomcat
Exercises, examples and other material relating to training module A657. This topic is presented on public courses Deploying Apache and Tomcat, Deploying Java Applications on Linux / Unix

Related technical and longer articles
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, ...
1377Load Balancing with Apache mod_jk (httpd/Tomcat)
A single instance of Apache httpd can handle a very large number of simple requests for files to be served ... but a single instance of Apache Tomcat can handle far fewer requests for applications to be run. After all, there's a big difference between just handing someone a piece of data and having ...
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 ...
2483Clustering on Tomcat
Subject: Clustering, using Apache http server (version 2.2.14 in my example) with mod_proxy_balancer as the front load splitter and Apache Tomcat 6.0.20 as the replicated application engine. [[Tip should also work for other recent 2.2.x and 6.0.x versions]] Background This is a follow on article from ...
1939mod_proxy_ajp and mod_proxy_balancer examples
One of the major enhancements in release 2.2 of Apache httpd is the addition of the mod_proxy_ajp and mod_proxy_balancer modules to the standard distribution. Gone are the days of needing to build special modules such as Jserv, jk, jk2 and warp to have httpd act as a "front" to a Java (Tomcat) server ...
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 ...
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 ...
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 ...
1566Strange behaviour of web directory requests without a trailing slash
When you call up a web page and you give a directory name WITHOUT a training slash, the web server return a "moved temporarily" page - code 302 - giving you the same name WITH a trailing slash as your new page: Dorothy:~ grahamellis$ telnet 80 Trying Connected to Escape ...
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 ...
Examples from our training material
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 [here].
Topics covered in this module
The Tomcat connector story.
Apache, Apache httpd and Apache Tomcat.
Do I need both servers?
How are the tasks divided?
Connector principles.
Proxy connector.
jk connector and configuring jk.
A practical complete installation.
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,Ruby, Lua, 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.

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