Web Application Deployment - Monitoring and load testing your server

Web Application Deployment module A692

Monitoring and load testing your server

Exercises, examples and other material relating to training module A692. This module is presented on Private Courses and Specially Run Courses only

Background

Is your web server barely coping or does it have plenty of capacity? What will happen if you get an increased load or a denial of service attack? Tools such as ab and Jmeter can help you learn the answers in a controlled environment.

Articles and tips on this subject		updated
3027	Server logs - drawing a graph of gathered data You can log pretty much any server data on a Linux or Unix system at regular intervals using a crontab job that adds a line onto the end of a file. That crontab job could be as simple as a shell command, or it could be a bash or perl script (the two most natural languages to choose for such a task) or ...	2014-09-29
2082	Jmeter - a first test case Would you like to see how your web site performs under load? I mentioned ApacheBench (ab) in a recent post, but you can also use a tool like Jmeter. And although Jmeter is written in and runs in Java, you can use it to look at the performance of other servers and network resources too. In famous ...	2012-10-13
2079	Java - Memory Allocation and garbage collection When you're running a dynamic application (and most of the languages we teach these days are dynamic), memory is allocated and released as necessary at run time, with allocation happening 'as required' and being released from time to time by a garbage collector - there is no point is collecting a few ...	2012-10-13
3019	Apache httpd Server Status - monitoring your server Do you want to know how your Apache httpd web server is running? The Server Status tool - a standard module supplied with the httpd daemon - can give you a lot of information, but by default it's turned off. Turning it on ... A work of caution before you turn it on. You do NOT want this to be world ...	2010-10-28
3015	Logging the performance of the Apache httpd web server Apache's mod_status allows you to take a look at how your Apache httpd server is running - you can see a snapshot of some basic stats of the server, and also the current status of each of the threads. There are two options that you can apply to the URL as you look at the page - a refresh option to cause ...	2010-10-26
2272	Monitoring and loading tools for testing Apache Tomcat The following monitoring and loading tools can be used to test Apache Tomcat and are all Open Source. This comparative summary includes a link to more details of each of these resources. ab - ApacheBench. Part of the standard Apache httpd download - a good but basic soak test where you can see how ...	2009-07-07
2080	Using ApacheBench and jconsole to test and monitor Tomcat jconsole lets you monitor Tomcat or another Java application so that you can see how much memory is in use, how many threads you have running, how many classes, etc. Here's an example of a Tomcat server that was sitting virtually unused ... which we then exercised through ApacheBench - the ab utility ...	2009-03-15
1718	Increasing Java Virtual Machine memory for Tomcat Q. "How do I increase the memory that my Java Virtual Machine in Tomcat can use?" A question asked - not for the first time - by a delegate on todays's Deploying Apache httpd and Tomcat course. A. Set the JAVA_OPTS environment variable. Longer answer: If you're running on a Unix or Linux system, ...	2008-07-25

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

ab, JConsole and Jmeter
Comparison ab v JConsole v Jmeter
Straightforward testing with ab.
Enabling JMX and running JConsole.
The Jmeter GUI and Engine.
Basic Installation and first test plan.
Running the tests and viewing the results.
Timer elements, conditionals and realistic simulation.
Multiple Jmeter engines and testing other services.

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