Am 06.01.2016 um 14:03 schrieb Karanbir Singh <mail-lists at karan.org>: > On 06/01/16 10:27, Bruno Martins wrote: >> Hi everyone, >> >> I hope this is the best place to post this question. >> >> I was wondering how can one upgrade from CentOS 6.7 to CentOS 7.x using redhat-upgrade-tool-cli in a scenario where you're upgrading an Hyper-V based VM. >> > > step1 would be to yum erase anything that didnt come from CentOS-6 > itself, you clearly have external repos on there. And I mean not just > remove the repos, but actually remove all the content that came from > other places. Leave only content from base + updates for CentOS-6 itself. > > secondly you need to use the centos tools from the centos repos IMHO, I would put this effort (the above, and post activities like verify everything e.g. sanity-checks etc.) into a new setup + service migration. A more clean procedure and better reproducible ... -- LF