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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.
Virtual hosting and mod_proxy forwarding of different domains (httpd)

Let's say that you want to set up a single web server to look after several domains, but then have parts of those domains served by other 'back room' servers. This diagram give you the picture - a single incoming IP address / server with all the security and logging stuff on it (and probably handing a lot of the general traffic too), but other machine(s) in the background fulfilling other specific roles. I set up a configuration like this yesterday - as part of an httpd and Tomcat Deployment Course.

The main server is Apache httpd (I had it on 192.168.200.214 - see diagram) and it was serving a domain called "devizes". [technical note - devizes.wellho.net or something fully qualifies when you take this out to the internet!]. However, I wanted to add the domains "lavington" and "urchfont" to it, with parts of the Lavington domain forwarded to another server on the same machine, and the entire Urchfont domain forwarded to another machine - 192.168.200.215.

Using Apache 2.2.x, I uncommented the virtual host support line in httpd.conf, and configured the virtual host file in the extra directory ... using mod_proxy to forward my traffic. The Virtual host configuration file, with lots of extra annotation, is available here.

Notice that is doesn't matter what the background servers are running (httpd, Tomcat or something else), or whether they're on the same physical box or a different one. And the whole scheme will easily expand to using balancing with mod_proxy_balancer ... all of which are the subject of other resources you'll find here abouts!

(written 2009-03-01)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A608 - Web Application Deployment - Apache httpd mod_proxy
  [631] Apache httpd to Tomcat - jk v proxy - (2006-03-03)
  [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)
  [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)
  [2273] Three recent questions on Tomcat Convertors - (2009-07-07)
  [2325] Apache, Tomcat, mod_proxy - (2009-08-06)
  [2482] Load balancing with sticky sessions (httpd / Tomcat) - (2009-10-29)
  [3293] Distributing the server load - yet ensuring that each user return to the same system (Apache httpd and Tomcat) - (2011-05-18)
  [3339] Simplest ever proxy configuration? - (2011-06-28)
  [3680] How can I run multiple web servers behind a single IP address? - (2012-04-02)
  [3892] Distributed, Balanced and Clustered Load Sharing - the difference - (2012-10-13)


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Internal Dummy Connections on Apache httpd
Virtual hosting and mod_proxy forwarding of different domains (httpd)
Tomcat 6 - Annotated Sample Configuration Files
Database connection Pooling, SSL, and command line deployment - httpd and Tomcat
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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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