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Web Application Deployment module A900
Tomcat - Extra Features
Exercises, examples and other material relating to training module A900. This topic is presented on public courses Deploying Apache and Tomcat, Deploying Java Applications on Linux / Unix

This module covers topics raised during Tomcat deployment courses, or which we will be covering on future private courses. Most of the subjects covered here will be of interest to a minority of trainees, so we won't be studying them in detail on every public course.

Related technical and longer articles
Load Balancing and Clustering

Articles and tips on this subjectupdated
1121Sharing the load with Apache httpd and perhaps Tomcat
"Can you show us how to share the load of a web site between various servers" is one of the question that comes up quite often on the more advanced web server configuration courses that we run. And, yes, I can, but I'll probably ask you a lot of extra questions about exactly how you want to load balance ...
2013-02-23
 
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 ...
2012-07-27
 
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 ...
2010-10-28
(longest)
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 ...
2009-05-10
 
1006Apache httpd and Apache Tomcat together tips
Many sites run two web servers - Apache httpd is ideal for plain HTML documents and scripts / programs that are single pages, run rarely, not all linked in together. Whereas Tomcat is an application container that suits applications that are run by tens of people all at the same time - great for banking, ...
2008-12-21
 
1896Virtual Hosts and Virtual Servers
Do you want to use a single computer to host many different web sites? There are no less than four quite common ways of doing this - each of which has its advantages and disadvantages. At the top left of my diagram, you have virtual hosting. In this arrangement, all the domains hosted on a single ...
2008-11-24
 
1899Virtual Hosting under Tomcat - an example
Tomcat supports "Virtual hosting", where you can direct several domain names to the same server computer / instance of Tomcat, and it will serve different content depending on which server you have asked even though they're on the same computer. Here is the important part of the server.xml file that ...
2008-11-21
 
1376Choosing between mod_proxy and mod_rewrite
If you're connecting an Apache httpd server to an Apache Tomcat server, you can do so via proxied http requests - i.e. have your customer facing http server relay the request on, perhaps having modified it, to Tomcat and then passing the response back. Two different Apache modules give you the facility ...
2008-02-23
 
1383Monitoring mod_jk and how it is load balancing
Apache httpd with mod_jk has the ability to balance the load forwarded to a number of instances of a Java application running in different Tomcat containers, probably on different host c.p.u.s in most circumstances. I covered this a few days ago - see here for details. But there's a follow up question ...
2007-10-07
 
1370Apache Tomcat Performance Tuning
Have you noticed what a lack of information there is in the printed material (or on the web too, come to that!) on performance tuning Apache Tomcat? The subject came up briefly during the course that I completed yesterday, when we looked at the changing the heap sizes and number of threads, and selecting ...
2007-10-02
 
934Clustering, load balancing, mod_rewrite and mod_proxy
"It's not friendly - it's like a reference book". Customer comment on yesterday's tailored training day, where we were load balancing a web application between a number of back end servers, using Apache httpd, with mod_proxy and mod_rewrite to do the clever bits. Our customers are right - it IS tough ...
2006-11-26
 
Examples from our training material
bal.httpd.conf   Load balancing a number of Tomcat instances via httpd
balance.conf   httpd mod_rewrite map for load balancing Apache Tomcat
cluck.pl   "heartbeat" script to switch servers
clust   Clustering - basic setup for server.xml
mod_rewrite-load_balance   Configuration file mod_rewrite load balancing
server.xml.virtual   Virtual Hosting on Tomcat.
sslc   server.xml setup example - SSL connector
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
Running a secure service through https.
Certificate provision.
Changes to server.xml.
A note on https.
Server testing through wget.
Clustering and load balancing.
Setting up a cluster.
The current state of clustering.
Load Balancing.
Load balancing - an alternative.
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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