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For 2023 (and 2024 ...) - 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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))
Apache, Tomcat, mod_proxy

The Apache httpd web server (a.k.a. "The Apache Server") is essentially a file (web page) server, written for fast performance in C, very reliable, and VERY widely used.

The Apache Tomcat web server (a.k.a. "Tomcat") is essentially a web application container that runs using web protocols. It's written in Java, works well, and is quite widely used as a backend server.

The Apache httpd server is ideal for site with lots of individual files to serve from time to time. The Apache Tomcat server is great for sites with large number of accesses to a handful of scripts. But of course, most real life web sites require a bit of one and some of the other. So in most cases that you'll find a Tomcat, you'll also find an Httpd in front of it, taking all the requests to the domain and passing on (via Apache mod_proxy or mod_jk to Tomcat these days) requests for the major application.

There's an example of an Apache httpd configuration file here that connects Apache httpd to Apache Tomcat via mod_proxy (also includes mod_jk and mod_rewrite examples), and a more complex example using virtual hosts (several domains server by the same server) here.

Our Apache httpd and Tomcat course covers mod_proxy, and (briefly) the additional mod_proxy_balancer which allows a single Apache httpd to pass on requests to several Tomcats (or actually to more httpds or other servers) to do the bulk of the processing. Apache Httpd and Apache Tomcat are two very flexible web server which - when used in combination - provide the platform on which you can run a wide range of sites / applications, and we'll teach you how to make the best of setting up and managing both servers, and linking them together.
(written 2009-08-06)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A608 - Web Application Deployment - Apache httpd mod_proxy
  [631] Apache httpd to Tomcat - jk v proxy - (2006-03-03)
  [934] Clustering, load balancing, mod_rewrite and mod_proxy - (2006-11-21)
  [1006] Apache httpd and Apache Tomcat together tips - (2006-12-24)
  [1121] Sharing the load with Apache httpd and perhaps Tomcat - (2007-03-29)
  [1376] Choosing between mod_proxy and mod_rewrite - (2007-10-02)
  [1566] Strange behaviour of web directory requests without a trailing slash - (2008-03-06)
  [1767] mod_proxy and mod_proxy_ajp - httpd - (2008-08-22)
  [1939] mod_proxy_ajp and mod_proxy_balancer examples - (2008-12-13)
  [1944] Forwarding session and cookie requests from httpd to Tomcat - (2008-12-14)
  [2062] Virtual hosting and mod_proxy forwarding of different domains (httpd) - (2009-03-01)
  [2273] Three recent questions on Tomcat Convertors - (2009-07-07)
  [2482] Load balancing with sticky sessions (httpd / Tomcat) - (2009-10-29)
  [3293] Distributing the server load - yet ensuring that each user return to the same system (Apache httpd and Tomcat) - (2011-05-18)
  [3339] Simplest ever proxy configuration? - (2011-06-28)
  [3680] How can I run multiple web servers behind a single IP address? - (2012-04-02)
  [3892] Distributed, Balanced and Clustered Load Sharing - the difference - (2012-10-13)

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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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