Does the exact distribution make any difference ?

The key factors that affect JBoss'es environment the most:

* The kernel.
* The JVM.

The key factors that affect the JVM the most:

* Glibc version.

Any modern distribution ships with a 2.6.x kernel and 2.3.x glibc.  So from a 
"will it run?" and "will it be stable?" there is little difference if you 
compare at this level.


To say that one distribution should be recommended over another really has to 
reflect on the support contract level you want covering everything installed 
from those disks.  If your level of expertise is such that you will never make 
the call for help then any distro will do you.

If you want to be sure you have no legal concerns then maybe debian is the 
distribution for you, I believe they exclude non GPL packages from their distro.

If you are a corporation who wants to be sure that the necessary skills to 
maintain the system(s) you deploy will be available at the right price for the 
forseeable future then this is where RHEL is pitching.  They have successfully 
created their own eco-system and I see JBoss set to do the same.


As for CentOS I believe they re-built all the GPLed code base from the RHEL 
distribution minus any tools and programs that RH has not donated (or at least 
made available under license) to the community.  They look set to sieze the 
market in areas where RH have now turned their back on because they have bigger 
fish to fry.  Windows is starting to look cheaper to deploy when pitched 
against RHELs current pricing policies, so much for the toy OS of 10 years ago 
:) this is all good.

Exactly which parts of CentOS does RH own the rights to ?  I think you'll find 
as an overall % of data thats its very very small.  All the core components of 
the system RH definatly dont own these are all under GPL.  It would be illegal 
for RH to make modifications to this code and re-distribute without that 
modification also falling under GPL.  This is the primary reason historically 
of why RH are forced release their SRPM disks at the same time.

You have to remember that if it were not for GPL RH as a company would not 
exist, and they must be making plenty of money right so think of this as their 
way of giving back to the community in market areas that _they_ have decided 
not to cater for any longer.


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