On Wed, Jul 06, 2011 at 03:26:39PM -0500, John J. Boyer wrote:
I've just installed CentOS 5.6. What would I get if I upgraded to 6?
Ponies.
Would I have to reinstall all applications or could I just restore my /etc and /usr directories and do an update?
There is no official upgrade path from 5.x to 6.0. You will need to do a full reinstall.
That being said there will likely be unsupported methods published to do such an upgrade; but it won't be supported and it may be prone to issues that are hard to troubleshoot.
There is full documentation, including feature comparisons and such, available at the upstream vendor's site:
John