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 Service
s. Each Service comprises a number of Connector
s and an Engine
, which contains one or more Host
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 articlesA651 - Web Application Deployment - Tomcat Overview 
Business is the predominant user of Tomcat, Perl and Tcl - (2004-09-15) 
Why is Tomcat called Tomcat? - (2005-11-17) 
Why run two different web servers - (2006-01-25) 
Web Application Components - (2006-03-28) 
Apache, Tomcat, Jakarta, httpd, web server - what are they? - (2007-07-13) 
More HowTo diagrams - MySQL, Tomcat and Java - (2008-08-24) 
Apache httpd and Apache Tomcat miscellany - (2009-01-30) 
Why put Apache httpd in front of Apache Tomcat - (2009-03-12) 
An FAQ on the Apache httpd and Apache Tomcat web servers, and on using them together - (2009-05-17) 
You do not just fly - that is just part of the journey - (2010-05-06) 
Servlet v JSP (Java Server Page). What is the difference? - (2013-02-06) 
Public training courses - upcoming dates - (2015-02-21)
Some other Articles
Summary - Apache httpd build on LinuxForwarding session and cookie requests from httpd to TomcatPort and GlassesChristmas scenes and eventsServer - Service - Engine - Host, TomcatURL rewriting with front and back serversmod_proxy_ajp and mod_proxy_balancer examplesPredictive Load Balancing - PHP and / or JavaGetting hold of the wrong end of the stickQuick Summary - PHP installation
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