Greetings,

----- Original Message -----
> Did anyone tried migrating from RHEL 7 to SL 7?
> I found some article in web but it doesn't look convincing. Official
> or semi/official instructions would be appreciated.

It is fairly easy to do... to move between RHEL, CentOS and SL... and probably OEL too.  I've done it a few times but not something I do regularly nor recently.  I'd recommend for your own piece of mind, you do it a few times in a virtual machine... small install... medium install... large install.  I don't recall having any issues the few times I did it.

TYL,
-- 
Scott Dowdle
704 Church Street
Belgrade, MT 59714
(406)388-0827 [home]
(406)994-3931 [work]