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From David Jencks <>
Subject Re: Multiple geronimo instances with little disk usage
Date Thu, 24 Nov 2005 19:28:47 GMT
This is not supported yet, but it definitely should be.

The idea is that everything except the var directory is shared between 
server instances, and each instance has its own var directory.  So, 
there are several gbeans with paths into the var directory: several are 
in the j2ee-system plan.  Some other gbeans in plans such as 
system-database and activemq-broker also store stuff in var.  The major 
problem at the moment is that most of these gbeans are in the system 
plan which is loaded before the config.xml file, so there is no 
opportunity to replace the "var" with the location of your choice.  
Unfortunately this means you have to build a whole set of 
configurations for each server, since the name of the base config is 
going to be different.

Does anyone have a good idea how to make this work with only a single 
set of configurations?  one possibility would be to have ServerInfo 
know where the var directory is, all gbeans that use var ask ServerInfo 
where it is, and have ServerInfo read it from a system property.  Then 
you could set the var location on the command line.  You can already 
set the config.xml on the command line, although this might not be 
needed if the var location could be set.  The only disadvantage I've 
thought of with this plan is that it builds the concept of the var 
directory into geronimo in a much more fundamental way than it is now.

david jencks

On Nov 24, 2005, at 11:11 AM, wrote:

> I would like to do this:
> 1) Unpack the geronimo distribution under /usr/local/geronimo (say) 
> and make it read-only.
> 2) Create many small _instances_ of geronimo running on all different 
> (sets of) ports, on the same machine.
> I would like the _code_ to be in one place, but the configurations of 
> the instances to all be different.
> Basically a lot like tomcat.
> Thanks
> Guglielmo
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