centos-bounces@centos.org wrote:

What is the best way to install CentOS 6?

DVDs you download and burn onto drives you've backed up onto (yet) other drives.

Is there an upgrade facility from CentOS-5.6?

Officially no, technically possible[1], considered unwise by many if not most system babysitters & admins.

If so, how does this compare with a clean installation?

See above: considered unwise even if possible.

[1] Say something is IMpossible, and you'll soon be run over by somebody who wasn't listening, and just did it.

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At Wed, 06 Jul 2011 21:27:08 +0200 CentOS mailing list centos@centos.org wrote:

What is the best way to install CentOS 6? Is there an upgrade facility from CentOS-5.6? If so, how does this compare with a clean installation?

The rule of thumb is to always to a fresh clean installation when upgrading from a major version (eg 5.x to 6.x). Make a backup of your configuration files. Presumably, your /home and/or /var/www directories are on their own file systems -- this makes things easier, althogh for a production server environment, you really want to do a fresh install on a fresh 'machine' (or virtual host), and then migrate services and content, testing as you go.