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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.
Simplest ever proxy configuration?

Scenario ... Apache Http Server fronting an Apache Tomcat server. Http Server has mod_rewrite and mod_proxy installed.

When we first did httpd and Tomcat courses, getting the two to talk to each other involved builds of extra modules and all sorts of configuration. I did my "simplest ever" this morning - it came down to these two directives in a .htaccess file:

RewriteEngine On
RewriteRule (.*) http://192.168.200.102:2080/latmjdemo/$1 [P,L]


Works a treat to forward a whole webapp. Our Deploying Apache httpd and Tomcat course has moved forward considerably over the years- we not have plenty more time for load balancing, cluseting, monitoring, sticky sessions and the like ... runs five of six times a year as a public course, with more delegates being taught on our other private courses than on the public ones.




So as not to overlook the more complex stuff ;-)

<Proxy balancer://crawl>
BalancerMember ajp://192.168.200.102:2009/latmjdemo route=jvm102
BalancerMember ajp://192.168.200.103:2009/latmjdemo route=jvm103
BalancerMember ajp://192.168.200.104:2009/latmjdemo route=jvm104
</Proxy>
ProxyPass /latmjdemo balancer://crawl stickysession=JSESSIONID|jsessionid
ProxyPassReverse /latmjdemo balancer://crawl
ProxyPassReverseCookieDomain .* 192.168.200.102
ProxyPassReverseCookiePath /latmjdemo /latmjdemo


That's a load balanced, sticky session working example
(written 2011-06-28)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A690 - Web Application Deployment - Clustering and load balancing
  [934] Clustering, load balancing, mod_rewrite and mod_proxy - (2006-11-21)
  [1121] Sharing the load with Apache httpd and perhaps Tomcat - (2007-03-29)
  [1771] More HowTo diagrams - MySQL, Tomcat and Java - (2008-08-24)
  [1993] Load Balancing - Hardware or Software? - (2009-01-15)
  [1995] Automated server heartbeat and health check - (2009-01-16)
  [2059] Sharing the load between servers - httpd and Tomcat - (2009-02-28)
  [2482] Load balancing with sticky sessions (httpd / Tomcat) - (2009-10-29)
  [2483] Clustering on Tomcat - (2009-10-30)
  [3293] Distributing the server load - yet ensuring that each user return to the same system (Apache httpd and Tomcat) - (2011-05-18)
  [3892] Distributed, Balanced and Clustered Load Sharing - the difference - (2012-10-13)
  [4432] Java web application for teaching - now with sessions and clustering / load balancing demonstrations - (2015-02-20)

A608 - Web Application Deployment - Apache httpd mod_proxy
  [631] Apache httpd to Tomcat - jk v proxy - (2006-03-03)
  [1006] Apache httpd and Apache Tomcat together tips - (2006-12-24)
  [1376] Choosing between mod_proxy and mod_rewrite - (2007-10-02)
  [1566] Strange behaviour of web directory requests without a trailing slash - (2008-03-06)
  [1767] mod_proxy and mod_proxy_ajp - httpd - (2008-08-22)
  [1939] mod_proxy_ajp and mod_proxy_balancer examples - (2008-12-13)
  [1944] Forwarding session and cookie requests from httpd to Tomcat - (2008-12-14)
  [2062] Virtual hosting and mod_proxy forwarding of different domains (httpd) - (2009-03-01)
  [2273] Three recent questions on Tomcat Convertors - (2009-07-07)
  [2325] Apache, Tomcat, mod_proxy - (2009-08-06)
  [3680] How can I run multiple web servers behind a single IP address? - (2012-04-02)

A607 - Web Application Deployment - Apache httpd mod_rewrite
  [755] Using different URLs to navigate around a single script - (2006-06-11)
  [1009] Passing GET parameters through Apache mod_rewrite - (2006-12-27)
  [1207] Simple but effective use of mod_rewrite (Apache httpd) - (2007-05-27)
  [1381] Using a MySQL database to control mod_rewrite via PHP - (2007-10-06)
  [1636] What to do if the Home Page is missing - (2008-05-08)
  [1731] Apache httpd, MySQL, PHP - installation procedure - (2008-08-01)
  [1778] Pointing all the web pages in a directory at a database - (2008-08-30)
  [1954] mod_rewrite for newcomers - (2008-12-20)
  [2094] If you have a spelling mistake in your URL / page name - (2009-03-21)
  [2555] Bookkeeping - (2009-12-29)
  [2728] Redirecting a home page using mod_rewrite - (2010-04-17)
  [2768] Carrying a long URL around - looking for memorable shorts - (2010-05-17)
  [2773] Dynamically watching your web site via a PHP wrapper - (2010-05-21)
  [2900] Redirecting a page - silent, temporary or permanent? - (2010-08-03)
  [2981] How to set up short and meaningfull alternative URLs - (2010-10-02)
  [3197] Finding and diverting image requests from rogue domains - (2011-03-08)
  [3568] Telling which ServerAlias your visitor used - useful during merging domains - (2012-01-04)
  [3753] Adding a passcode to a directory - (2012-06-05)
  [3862] Forwarding a whole domain, except for a few directories - Apache http server - (2012-09-17)


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Summer Sunday Train Service Starts - Swindon Chippenham and Melksham to Weymouth
A Holiday
Farewell to the Hercules?
Summer Sunday Timetable - TransWilts Trains
Simplest ever proxy configuration?
Return trip - Dogs Trust, Newbury
Home Grown Pigs, near Melksham Station
Efficient travel - from Melsksham to Edinburgh by Sleeper Train
Practical Extraction and Reporting
A lesson from the sporran market?
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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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