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From Rainer Jung <>
Subject Re: mod_ajp and Load-Balancing Issue
Date Fri, 04 Jul 2008 17:12:42 GMT
Plana, Richard schrieb:
> Hi,
> I've two tomcat servers being proxied and load-balanced by httpd using
> mod_ajp (using balancer:). However, it seems when the proxy switches
> from one server to another, the user session gets lost.
> Could people recommend a way to correct my setup for doing
> load-balancing with this scenario?
> Oddly enough, it seemed to have functioned well when using mod_jk.

If you don't want to replicate all sessions between your tomcat nodes, 
then use stickyness in the load balancer. This means, once a session has 
started for a user on some node, all further requests of the user 
belonging to this session will be routed to the same node.

Give each Tomcat in server.xml a unique jvmRoute and then set the route 
parameter to the value of the corresponding jvmRoute of the load 
balancer member in your mod_proxy_balancer configuration. Look for route 
in the mod_proxy documentation page.

Caution: the Tomcat instances need to have different jvmRoute values.

The principles in mod_jk are the same. At least you need to set the 
jvmRoute. In mod_jk stickyness is the default, and the name of the 
worker I the default route. So you might have been lucky to set your 
jvmRoute to the worker names and that was sufficient in the mod_jk case.



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