DISCLAIMER I BY NO MEANS TAKE RESPONSIBILITY FOR YOUR SYSTEM. The instructions below are what worked for ME. I hope it is helpful to someone else.
I decided tonight to downgrade from CentOS 8 Stream → CentOS 8 Linux in preparation for transitioning over to Rocky. Below is how i did it and the problem(s) i ran into.
- Download repo and release RPMs
- Remove stream repo and release RPMs and install the plain CentOS ones
sudo rpm -e --nodeps centos-stream-release centos-stream-repos
sudo rpm -ivh centos-linux-release-8.3-1.2011.el8.noarch.rpm centos-linux-repos-8-2.el8.noarch.rpm
- Distrosync (i had to run with
--allowerasing in order for it to run)
sudo yum distro-sync --allowerasing
When my system rebooted, i could no longer login. To fix this, i had to follow the Red Hat recovery procedure to boot into recovery mode and fix
authselect that was broken for some reason: Chapter 15. Changing and resetting the root password Red Hat Enterprise Linux 8 | Red Hat Customer Portal
At GRUB 2 menu, edit the
CentOS Linux 8 boot kernel (there will be some
CentOS 8 Stream lines, ignore those)
In the GRUB 2 menu, go the line that starts with
linux at the end add
When the system boots up, your root filesystem will be placed into
/sysroot, we need to remount that from read-only to read-write
mount -o remount,rw /sysroot
- Enter a chroot environment at
/sysroot this will allow our CLI utilities to work properly
- Notice that
passwd doesn’t work and
/etc/nsswitch.conf is a broken symlink
$ cat /etc/nsswitch.conf
File doesn't exist # i'm paraphrasing here because i forget the exact error
# minimal sets up for reading from /etc/passwd and /etc/shadow only, no sssd daemon
authselect select minimal
- Exit (yes, exit) the recovery and this will continue the boot and relabel the filesystem properly
- System will reboot
- If you were like me and have proprietary NVIDIA drivers, reinstall your NVIDIA drivers with the current kernel (in
init 3 of course), reboot and all good!
AGAIN This is just what worked for me, your mileage may vary and i take no responsibility for any harm done or files lost if you try this on your own system.