Hello, I did a minimal install in Virtualbox for Centos 6 and tried to upgrade using the upgrade tools, from centos's repo[1]. But this tends to fail[2].
preupg --list comes up blank.
After this I directly proceeded to use redhat-upgrade-tool, as it turns out I need to use --force since preupg failed.
This works, I encountered errors like[3], but after installing the CentOS 7 keys manually everything worked out.
In the end I had a bootable and upgraded CentOS 7 box.
Cheers,
Gaurav
