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Date: Thu, 16 Feb 2006 13:05:23 -0800
To: users@httpd.apache.org
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From: ian@1321.org (Ian Shafer)
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Subject: Re: [users@httpd] Proxying and load balancing
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Check out the proxyHost and proxyPort XML attributes on this page:

http://tomcat.apache.org/tomcat-5.5-doc/config/http.html

Basically, you need to set these to your load balancer. Then clients
will always go through the load balancer.

Ian

On  0, Douglas WF Acheson <dwfa@dwfa.ca> did scribble:
> Hello,
> 
>   I am trying to set up httpd (v2.2.0) as a load balancer (for development testing, poc stuff) using the mod_proxy_balancer (and appropriate dependencies).  I am fronting a J2EE applications running under tomcat 5.5.15 on two machines.
> 
>   I seem to have it working for the most part, but am confused by  a couple of things:
> 
> 1. The URL in the web browser changes when I access the LB, that is the LB actually does a client side redirect:
> For example the URL I use is
>   192.168.1.1:8080/myProject
> but when the page renders, the URL is now
>   192.168.1.2:8080/myProject
> or
>   192.168.1.3:8080/myProject
> 
> What I want to achieve is, have the URL remain in the context of the LB/proxy (or reverse proxy), so that if machine 1 goes away the LB can redirect to another machine.  'Cause right now the user will have to enter the URL of the LB to get to the app if something fails.
> 
> 2. In the segment below, there is a section "<Location /tc-bal>" that seems to be needed.  I do not understand why?  I crafted this using the examples config files with the install for win32.
> 
>   Thx in advance for help ...
> 
> Regards,
> Douglas WF Acheson
> 
> <!-- snip snip -->
> <IfModule !proxy_module>
>     LoadModule proxy_module modules/mod_proxy.so
> </IfModule>
> 
> #<IfModule !proxy_ajp_module>
> #    LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
> #</IfModule>
> 
> <IfModule !proxy_http_module>
>     LoadModule proxy_http_module modules/mod_proxy_http.so
> </IfModule>
> 
> <IfModule !proxy_balancer_module>
>     LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
> </IfModule>
> 
> # ---------------------------------------------------------------------------- #
> # Define the tomcat load balancer                                              #
> # ---------------------------------------------------------------------------- #
> 
> <IfModule proxy_balancer_module>
> 	ProxyRequests off
> 
>   <Proxy balancer://bpsCluster>
>       BalancerMember http://192.168.1.1:8080 loadfactor=50
>       BalancerMember http://192.168.1.3:8080 loadfactor=50
>       Order Deny,Allow
>       Allow from all
>   </Proxy>
> 
>   <Location /tc-bal>
>       ProxyPass balancer://myCluster stickysession=jsessionid
>   </Location>
> 
>   <Location /balancer-manager>
>       SetHandler balancer-manager
>       Order Deny,Allow
>       Allow from all
>   </Location>
> 
>   <Location /BpsProject>
>       ProxyPass balancer://myCluster/myProject
>       ProxyPassReverse balancer://myCluster/myProject
>       Order Deny,Allow
>       Allow from all
>   </Location>
> 
> </IfModule>
> 
> Regards,
> Douglas WF Acheson 
> 
> 
> 
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