The system is unable to boot and the only way to run the necessary fix is to chroot into it from rescue mode on the media.
1. First boot the system into Rescue Mode from the media. For best results use media that matches the version and service pack of the system.
2. Once it's finished loading, log in as root.
3. Mount the root partition or logical volume to /mnt
# mount /dev/<device name> /mnt
If it's not known where the root file system is, it needs to be guessed until found by mounting each possibility and checking its contents. Run the following command to list all available partitions:
# cat /proc/partitions
List all available logical volumes with this command:
After mounting each one check its contents by listing the mounted directory. For example if mounted to /mnt run:
# ls /mnt
Some directories that should be listed to verify it is a root file system are /root /boot and /home.
4. Once mounted use the following for-loop to rbind the virtual file systems:
# for i in proc sys dev; do mount --rbind /$i /mnt/$i ; done
Alternatively, mount them each separately rather than using the for-loop:
# mount --rbind /proc /mnt/proc
# mount --rbind /sys /mnt/sys
# mount --rbind /dev /mnt/dev
5. After the root file system and virtual file systems are mounted run this command to chroot in:
# chroot /mnt
After chrooted in it is a best-practice to run this command to make sure all other necessary partitions are also mounted:
# mount -a
Keep in mind that a chrooted system was not booted. This means that services aren't running upon chroot into the system.
In SLE 12 systemd does not allow services to be started within the chrooted environment. Executable commands, so long as they don't rely on those services, should still work though. If you absolutely need to have a systemd service running in rescue mode look into systemd-nspawn
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