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20.9.2014 - We have just updated our course layouts and descriptions and added our 2015 schedule.

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 your servers respond to traffic of a particular type from a single source. Good for looking at 'denial of service' type attacks; too basic for typical loading tests.

Example run from command line
ab -n 2000 -c 30 http://192.168.200.215:8080/whm_course/demo.jsp

That's calling for a page to be loaded 2,000 times - with a concurrency of 30 (in other words for there to be 30 connections all at the same time, simulating visits from 30 different places.

jmeter. Open source, part of Apache jakarka. You set up a number (minimum one) of testing machines to generate traffic to the server. You then run a GUI tool on one of the testing machines to gather in the results and process them - into graphic, text report or log forms.

Jmeter allow much more realistic traffic simulation than ab, but is much more complex to set up - people struggle at their first use. We have a sample first demonstration on our web site at:
http://www.wellho.net/mouth/2082_Jmeter-a-first-test-case.html

jconsole. A way of looking inside the jvm and seeing resource use, splitting the heap down to the various generations if need be. Unlike jmeter and ab, this is not a load tester - it adds no load; rather it is a tool for examining a running system.

Example:
http://www.wellho.net/mouth/2080_Using-ApacheBench-and-jconsole-to-test-and-monitor-Tomcat.html

Tomcat Manager. By providing a "manager" role in Tomcat, you can enable the manager, allowing the control of individual web applications (stop, start, etc) rather than having to stop and start all web applications on the same tomcat instance at the same time.

Sample file:
http://www.wellho.net/resources/ex.php4?item=a652/tomcat-users.course.xml

It is also possible to control the logins to the manager using accounts held in databases - there is a sample in the shipped server.xml file.

The Tomcat Manager is listed in this section because it also provides management information with regards to the internal operations of Tomcat and the jvm.
(written 2009-07-07)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A603 - Web Application Deployment - Further httpd Configuration
  [4001] Helping search engines with appropriate 400 error codes - (2013-02-11)
  [3955] Building up from a small PHP setup to an enterprise one - (2012-12-16)
  [3862] Forwarding a whole domain, except for a few directories - Apache http server - (2012-09-17)
  [3635] Parse error: parse error, unexpected T_STRING on brand new web site - why? - (2012-03-03)
  [3449] Apache Internal Dummy Connection - what is it and what should I do with it? - (2011-09-19)
  [3133] An image from a website that occasionally comes out as hyroglyphics - (2011-01-14)
  [2900] Redirecting a page - silent, temporary or permanent? - (2010-08-03)
  [2478] How did I do THAT? - (2009-10-26)
  [2060] Database connection Pooling, SSL, and command line deployment - httpd and Tomcat - (2009-03-01)
  [1974] Moving a directory on your web site - (2009-01-03)
  [1955] How to avoid duplicating web page maintainance - (2008-12-20)
  [1954] mod_rewrite for newcomers - (2008-12-20)
  [1939] mod_proxy_ajp and mod_proxy_balancer examples - (2008-12-13)
  [1778] Pointing all the web pages in a directory at a database - (2008-08-30)
  [1767] mod_proxy and mod_proxy_ajp - httpd - (2008-08-22)
  [1762] WEB-INF (Tomcat) and .htaccess (httpd) - (2008-08-20)
  [1707] Configuring Apache httpd - (2008-07-12)
  [1636] What to do if the Home Page is missing - (2008-05-08)
  [1619] User and Group settings for Apache httpd web server - (2008-04-22)
  [1566] Strange behaviour of web directory requests without a trailing slash - (2008-03-06)
  [1564] Default file (MiMe types) for Apache httpd and Apache Tomcat - (2008-03-04)
  [1554] Online hotel reservations - Melksham, Wiltshire (near Bath) - (2008-02-24)
  [1551] Which modules are loaded in my Apache httpd - (2008-02-23)
  [1381] Using a MySQL database to control mod_rewrite via PHP - (2007-10-06)
  [1377] Load Balancing with Apache mod_jk (httpd/Tomcat) - (2007-10-02)
  [1355] .php or .html extension? Morally Static Pages - (2007-09-17)
  [1351] Compressing web pages sent out from server. Is it worth it? - (2007-09-14)
  [1207] Simple but effective use of mod_rewrite (Apache httpd) - (2007-05-27)
  [1121] Sharing the load with Apache httpd and perhaps Tomcat - (2007-03-29)
  [1080] httpd.conf or .htaccess? - (2007-02-14)
  [1009] Passing GET parameters through Apache mod_rewrite - (2006-12-27)
  [934] Clustering, load balancing, mod_rewrite and mod_proxy - (2006-11-21)
  [853] To list a directory under httpd on a web server, or not? - (2006-09-02)
  [755] Using different URLs to navigate around a single script - (2006-06-11)
  [662] An unhelpful error message from Apache httpd - (2006-03-30)
  [649] Denial of Service ''attack'' - (2006-03-17)
  [631] Apache httpd to Tomcat - jk v proxy - (2006-03-03)
  [550] 2006 - Making business a pleasure - (2006-01-01)
  [526] Apache httpd - serving web documents from different directories - (2005-12-12)
  [466] Separating 'per instance' data from binaries and web sites - (2005-10-16)
  [345] Spotting a denial of service attack - (2005-06-12)

A656 - Web Application Deployment - More Tomcat Configuration
  [3018] Tuning Apache httpd and Tomcat to work well together - (2010-10-27)
  [1899] Virtual Hosting under Tomcat - an example - (2008-11-22)
  [1718] Increasing Java Virtual Machine memory for Tomcat - (2008-07-24)
  [1370] Apache Tomcat Performance Tuning - (2007-09-29)
  [282] Short weekend - (2005-04-17)

A692 - Web Application Deployment - Monitoring and load testing your server
  [3027] Server logs - drawing a graph of gathered data - (2010-11-03)
  [3019] Apache httpd Server Status - monitoring your server - (2010-10-28)
  [3015] Logging the performance of the Apache httpd web server - (2010-10-25)
  [2082] Jmeter - a first test case - (2009-03-14)
  [2080] Using ApacheBench and jconsole to test and monitor Tomcat - (2009-03-14)
  [2079] Java - Memory Allocation and garbage collection - (2009-03-14)

A901 - Replaced Page

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Three recent questions on Tomcat Convertors
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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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