I have older systems out there that work fine, just for what ever reason would be great to upgrade from a C5 -> C7 (due to no longer supported) or C6 > C7 (for updated packages).
Sounds like the upgrade tool is not quite an option… I was thinking…
What would be wrong with any “easy” script that did the following:
1) Removed all packages with the –justdb option.
2) Import the RPM-GPG-KEY-CentOS-7
3) install the CentOS-release-7.3.1611 … rpm
4) yum -y upgrade
5) yum groupinstall “GNOME Desktop” (for example)
and reboot of course.
Does that have any chance or working and be valid?