On 2019-10-01 12:57, MAILIST wrote: >> Your answer has nothing to do with the original question which is related >> to upgrade method and not condition for reinstalling without loosing >> data. > > After 40 years of upgrading many different operating systems, > Windows (from 3.1 to 10), CentOS 6 to 8, Ubuntu, Fedora, Red Hat, > AT&T Unix, VAX VMS; I have never observed an upgrade from one major > version to the next to work. The last one I tried using their "upgrade > process" was Ubuntu 18 to 19. Didn't work. I routinely upgrade FreeBSD. Last time it was 11.3 to 12.0. Always smooth. Maybe I'm just lucky... Valeri > > When a new major version of any o/s is released, I have found it best > to save what application data I can, delete all partitions on the target > boot disk, and then install from scratch. > > I learned years ago to keep application data out of system directories, > ideally on a separate drive that can be mounted on the new installation. > Yes, you do loose your settings, but that's why it would be wise to stick > with the defaults, if possible. Yes, the database is always in a system > directory by default, so that's why you do a dump before the upgrade. > My "cheat-sheet" of things to do during an upgrade is about 10 pages long. > > If you do have to restore from a backup, be sure you do not restore any > system directories (like /etc/fstab). I made this mistake, once! > > System admins must learn to bite the bullet on this part of their job. > > Todd Merriman > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos > -- ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++