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From: Jeff Genender <jgenender@savoirtech.com>
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Subject: [LONG]Tomcat clustering enabling GBeans howto - Part 2
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Part 1 showed a simple clustering for the Engine.  This is doable at the 
host level as well by *not* setting the CatalinaCluster attribute for 
the Engine, but setting it for the Host.

Now what about the Context?  This is where the geronimo-web.xml comes in...

You will create your TomcatCluster Gbean in the geronimo-web.xml file. 
In the Tomcat namespace, there is a new parameter called "cluster"...so 
you would add the following to your geronimo-web.xml:

...
<cluster>TomcatCluster</cluster>
...

This must come after the <tomcat-realm> and before the naming tags.  See 
the geronimo-tomcat-1.0.xsd for more details.

If you are using the generic namespace, then your <cluster> tag will go 
inside the <container-config> tags.