Puppet users - Apr 2014 - How to make sure a config file haven't changed in an OS upgrade?

Dear all =)

I have a CentOS5 node that I would like to upgrade to CentOS6, but how can 
I trust that my CentOS5 node manifest won't destroy the config files on the 
CentOS6 node because the config files have changed from CentOS5 to CentOS6?

How do you prevent this kind of situation? Do you make a copy of all the 
CentOS5 config files and diff them with the CentOS6 ones? If, how do you do 
that in an automated way?

Kindest regards
Jasmine =)


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