[CentOS] Upgrade from CentOS6.6 to CentOS 7

Tue Dec 15 15:17:37 UTC 2015
Traiano Welcome <traiano at gmail.com>

Hi All

Is it possible to upgrade from CentOS 6.7 to CentOS 7?

I  see there is some attempt at an upgrade tool available, but it's
apparently broken:


Would anyone be able to recommend a manual upgrade procedure to
upgrade a minimal CentOS 6.7 system to one or other version of CentOS

Many thanks in advance,