<div dir="ltr">Hello,<div> 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].</div><div>preupg --list comes up blank.</div>
<div> After this I directly proceeded to use redhat-upgrade-tool, as it turns out I need to use --force since preupg failed.</div><div>The exact commend used is "redhat-upgrade-tool --force --network 7.0 --instrepo <a href="http://mirror.centos.org/centos-7/7/os/x86_64/">http://mirror.centos.org/centos-7/7/os/x86_64/</a>"</div>
<div>This works, I encountered errors like[3], but after installing the CentOS 7 keys manually everything worked out.</div><div>In the end I had a bootable and upgraded CentOS 7 box.</div><div><br></div><div>Cheers,</div>
<div> Gaurav</div><div><br></div><div>[1] <a href="http://dev.centos.org/centos/6/upg/x86_64/Packages/">http://dev.centos.org/centos/6/upg/x86_64/Packages/</a></div><div>[2] <a href="http://i.imgur.com/zd1HOKV.png">http://i.imgur.com/zd1HOKV.png</a></div>
<div>[3] <a href="http://i.imgur.com/7bU1nU7.png">http://i.imgur.com/7bU1nU7.png</a></div></div>