On Tue, Jun 2, 2015 at 11:52 AM, Neal Becker <ndbecker2@xxxxxxxxx> wrote: > I think this may be all I need: > > sudo mount /dev/sda3 /mnt > [nbecker@nbecker2 ~]$ ls -l /mnt > total 0 > drwxr-xr-x. 1 root root 14 Jun 1 18:46 home > dr-xr-xr-x. 1 root root 172 Jun 2 09:39 root > > [nbecker@nbecker2 ~]$ sudo btrfs sub snap /mnt/root /mnt/root-f21 > Create a snapshot of '/mnt/root' in '/mnt/root-f21' > [nbecker@nbecker2 ~]$ ls -l /mnt > total 0 > drwxr-xr-x. 1 root root 14 Jun 1 18:46 home > dr-xr-xr-x. 1 root root 172 Jun 2 09:39 root > dr-xr-xr-x. 1 root root 172 Jun 2 09:39 root-f21 > > So now I have a snap of f21 root in in root-f21 subvol, and I should be able > to rollback by editing grub.cfg and /etc/fstab to point to root-f21 subvol > instead of root subvol, correct? Correct. One small problem is the fstab in root-f21/etc/fstab still has mount option subvol=root. So you'd maybe want to change that or you get boot failure. Another problem is a good chance that F21 kernels get removed (eventually) from the ext4 /boot and then you can't use a Fedora 22 kernel menu entry since root-f21 lib/modules doesn't have those kernels. So you'll want to make sure you have both /etc/yum.conf and /etc/dnf/dnf.conf set to preserve more than 3 kernels to make sure neither one starts deleting kernels you might need. Of course, then the problem is ext4 /boot can become full which is why we really need /boot on Btrfs support from grubby. :-P Only 22 days later... -- Chris Murphy -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
