Rescue mode

I use ZFS on Root when ever I can. In case you broke something so terribly, that it doesn’t boot anymore and you need to boot a rescue-system like Grml.

Install zfs

Install in your rescue-system

# apt install zfs-dkms

Mount it

Import the rpool with a different mountpoint, otherwise you can’t mount it somewhere else.

# zpool import -R /mnt rpool -f -N

Because you are intelligent, everything is encrypted. So you need to unlock your rpool.

# zfs load-key rpool

Mount / before the others, because the order might be wrong.

# zfs mount rpool/ROOT/debian

Now also import bpool.

# zpool import -R /mnt bpool -f -N

… and mount all.

# zfs mount -a

mount-bind all the important special filesystems to /mnt

# for i in proc sys dev dev/pts; do mount -o bind /${i} /mnt/${i}; done

Jump into the system to repair.

# chroot /mnt

Now do fix your sh!t.

Cleanup

On your next boot, you might need to fix the mountpoint of rpool.

TODO: add this in detail, the next time I need it.