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From "Axel-Stephane SMORGRAV" <Axel-Stephane.SMORG...@europe.adp.com>
Subject RE: [users@httpd] Load balancing problem
Date Tue, 08 Jan 2008 12:45:00 GMT
Hello there,

Although I am not very experienced in using proxy_balancer, I did experiment with it a little
bit a while ago.

>From what I remember, it expects the route to be appended to the balancer cookie value.
In your example it is expecting a cookie of JSESSIONID=0000K8zpkCtCy6l9Y91Q86bETpX:-1.1 or
JSESSIONID=0000K8zpkCtCy6l9Y91Q86bETpX:-1.2

If a valid route is not found in the cookie, it will not apply stickiness.

Unless you can actually yourself determine part of the value of JSESSIONID in order to include
a route which can be interpreted by proxy_balancer, JSESSIONID is not a good balancer cookie.
What I did myself was to set a cookie on the browser whenever I detected a request not containing
a balancer cookie.

        RewriteMap  bID rnd:/path/balancers.map

        RewriteCond %{HTTP_COOKIE}      !BALANCER=route
        RewriteRule . - [CO=BALANCER:route.${bID:rand}:%{ENV:domain}]

The balancers.map file may contain:

rnd	1|2|3|4

Another way of setting the cookie would be to direct a request not containing a cookie to
a specific path on the application server, let the balancer determine which application server
that should be, and let the application server set a cookie corresponding to itself.

        RewriteCond %{HTTP_COOKIE}      !BALANCER=route
        RewriteRule . /myapp/setbalancercookieandcreatesessionobject

or something like that.

It would be interesting to know what others are doing on that subject.

-ascs

________________________________

De : Brendan.McKenna@mdsuk.com [mailto:Brendan.McKenna@mdsuk.com] 
Envoyé : mardi 8 janvier 2008 13:06
À : users@httpd.apache.org
Objet : [users@httpd] Load balancing problem



Hi, 

        I am running httpd version 2.2.6 on Windows XP SP2.  I am trying to use sticky sessions
to route users to a server, based on the value of the JSESSIONID cookie in their request.
 While the load balancing does appear to work, the sticky sessions don't appear to be working.
 My configuration looks like this: 


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