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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Server - Service - Engine - Host, Tomcat

A Tomcat Server can run one or more Services. Each Service comprises a number of Connectors and an Engine, which contains one or more Hosts.

You connect to a Tomcat Server via an appropriate connector, which defines the port number, the protocol, and various other connection parameters, and within the Tomcat server information is generated for the particular host (domain) that you're serving.

Q: Why would you want multiple services?

A: So that you can use a single copy of Tomcat to serve different hosts in different ways.

The top diagram shows you a server with five connectors and a single service, accessing 3 hosts. Any of the five connectors can access any of the five hosts, so you've a total of fifteen different routes to the data.

The lower diagram shows, again, 5 connectors and 3 hosts - but this time two of the connectors access a service who's engine looks after just one host, and the other three connectors access a second service that looks after two hosts. Result? Just ( 2 x 1 + 3 x 2) = 8 different routes to data.


Why might this be useful? Let's say that the single host with two connectors provided internet-accessible http and https services, and the other two hosts were accessible via ajp and http proxies, together wish a second http port for testing. And that's all you wanted - no crossovers, but also no need to run two complete Tomcats!
(written 2008-12-14, updated 2008-12-15)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A651 - Web Application Deployment - Tomcat Overview
  [49] Business is the predominant user of Tomcat, Perl and Tcl - (2004-09-15)
  [498] Why is Tomcat called Tomcat? - (2005-11-17)
  [576] Why run two different web servers - (2006-01-25)
  [659] Web Application Components - (2006-03-28)
  [1265] Apache, Tomcat, Jakarta, httpd, web server - what are they? - (2007-07-13)
  [1771] More HowTo diagrams - MySQL, Tomcat and Java - (2008-08-24)
  [2016] Apache httpd and Apache Tomcat miscellany - (2009-01-30)
  [2077] Why put Apache httpd in front of Apache Tomcat - (2009-03-12)
  [2186] An FAQ on the Apache httpd and Apache Tomcat web servers, and on using them together - (2009-05-17)
  [2753] You do not just fly - that is just part of the journey - (2010-05-06)
  [3997] Servlet v JSP (Java Server Page). What is the difference? - (2013-02-06)
  [4434] Public training courses - upcoming dates - (2015-02-21)


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Summary - Apache httpd build on Linux
Forwarding session and cookie requests from httpd to Tomcat
Port and Glasses
Christmas scenes and events
Server - Service - Engine - Host, Tomcat
URL rewriting with front and back servers
mod_proxy_ajp and mod_proxy_balancer examples
Predictive Load Balancing - PHP and / or Java
Getting hold of the wrong end of the stick
Quick Summary - PHP installation
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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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