Port and Glasses

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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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

Port and Glasses

I don't expect you've seen my picture with TCP port numbers coming out of my head very often, have you? In fact this may be the first picture of me in glasses that I've published here. That's not a vanity thing - just that it's only been over the course of this year that I've had to join the majority of people of my age and start wearing the things.

What are the port numbers all about? It's a characteristic of Tomcat that it can be set up to accept connections on a number of different ports, and in a number of different protocols, all at the same time - and this is something that we do on the Apache Tomcat Course that we run every couple of months. Last week, I set up ...
• Port 5008 as the shutdown port
• Port 5050 as my regular http connector
• Port 5009 for ajp connections (mod_jk or mod_proxy_ajp accessors)
• Port 5052 for proxies httpd connections (mod_proxy_http)
... and that's fairly typical. Even though our clients are often interested in having their Tomcatted websites accessible via https (secure protocol), such traffic is probably going to be fronted via Apache http. After all, if an organisation is going to start using the secure https protocol between two servers sitting in the same rack, or even on the same box (usually how they are run!), they either don't fully understand what they're doing, or they are paranoid!

(written 2008-12-14)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles

A654 - Web Application Deployment - Configuring and Controlling Tomcat
  [837] Tomcat - Shutdown port - (2006-08-18)
  [907] Browser -> httpd -> Tomcat -> MySQL. Restarting. - (2006-10-28)
  [914] A practical example of roles - (2006-11-04)
  [1351] Compressing web pages sent out from server. Is it worth it? - (2007-09-14)
  [1370] Apache Tomcat Performance Tuning - (2007-09-29)
  [1503] Web page (http) error status 405 - (2008-01-12)
  [1553] Automatic startup and shutdown of Tomcat - (2008-02-24)
  [1762] WEB-INF (Tomcat) and .htaccess (httpd) - (2008-08-20)
  [1994] tomcat-users.xml; what a difference a space made - (2009-01-16)
  [2039] The Invoker - (2009-02-13)
  [2061] Tomcat 6 - Annotated Sample Configuration Files - (2009-03-01)
  [2163] CATALINA_OPTS v JAVA_OPTS - What is the difference? - (2009-05-09)
  [2652] Reading and writing cookies in Java Servlets and JSPs - (2010-02-26)
  [3043] Gathering information - logging - with log4j. First steps. - (2010-11-12)

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Christmas scenes and events

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Forwarding session and cookie requests from httpd to Tomcat

Some other Articles

Perl substitute - the e modifier
Variable Types in Perl
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

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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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