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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.
Monitoring 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 "how is the loading working out", and the status monitor in mod_jk provides you with a web front end to the stats. There's a sample configuration file here; the captured display looks something like:


(written 2007-10-07)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A900 - Web Application Deployment - Tomcat - Extra Features
  [934] Clustering, load balancing, mod_rewrite and mod_proxy - (2006-11-21)
  [1006] Apache httpd and Apache Tomcat together tips - (2006-12-24)
  [1121] Sharing the load with Apache httpd and perhaps Tomcat - (2007-03-29)
  [1370] Apache Tomcat Performance Tuning - (2007-09-29)
  [1376] Choosing between mod_proxy and mod_rewrite - (2007-10-02)
  [1377] Load Balancing with Apache mod_jk (httpd/Tomcat) - (2007-10-02)
  [1896] Virtual Hosts and Virtual Servers - (2008-11-20)
  [1899] Virtual Hosting under Tomcat - an example - (2008-11-22)
  [1939] mod_proxy_ajp and mod_proxy_balancer examples - (2008-12-13)
  [3018] Tuning Apache httpd and Tomcat to work well together - (2010-10-27)

A655 - Web Application Deployment - Using Tomcat and Apache httpd Together
  [436] Linking Apache httpd to Apache Tomcat - (2005-09-05)
  [576] Why run two different web servers - (2006-01-25)
  [631] Apache httpd to Tomcat - jk v proxy - (2006-03-03)
  [1549] http, https and ajp - comparison and choice - (2008-02-22)
  [1552] Extra public classes in deploying Apache httpd and Tomcat - (2008-02-24)
  [1771] More HowTo diagrams - MySQL, Tomcat and Java - (2008-08-24)
  [1938] Predictive Load Balancing - PHP and / or Java - (2008-12-13)
  [1940] URL rewriting with front and back servers - (2008-12-14)
  [1944] Forwarding session and cookie requests from httpd to Tomcat - (2008-12-14)
  [2482] Load balancing with sticky sessions (httpd / Tomcat) - (2009-10-29)
  [3999] Handling failures / absences of your backend server nicely - (2013-02-08)


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Error logging to file not browser in PHP
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Delegates of all shapes and sizes
An email update for past guests and delegates
Monitoring mod_jk and how it is load balancing
First Great Western - information for customers
Using a MySQL database to control mod_rewrite via PHP
Static variables in PHP
Simple page password protection - PHP
Etag in http headers - what is it?
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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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