Moving the Linux OS root to zfsroot

linux-rooton-zfs.txt

Moving the OS to the zfsroot.
Source:
https://www.reddit.com/r/zfs/comments/9zr5gr/which_linux_disro_is_the_most_stable_and/eadpmgm/?context=3
https://web.archive.org/web/20210226222225if_/https://www.reddit.com/r/zfs/comments/9zr5gr/which_linux_disro_is_the_most_stable_and/

Original code follows later. simplified code is here. USE THE ORIGINAL CODE after adaptation.

add-apt-repository universe
apt update 
apt install zfs-initramfs
zpool create -o ashift=12 -o mountpoint=none ... 
zpool export os 
zpool import -R /z os -d /dev/disk/by-id 
zfs create -o mountpoint=/ os/linux
rsync -aHSXAx /target/ /z/
for d in dev dev/pts proc sys run ; do mount -o bind /{,z/}$d ; done
echo "Make sure zfs module doesn't eat half your RAM, adjust as you want but don't make them equal";
echo "options zfs zfs_arc_min=$((128*1024*1024))" >> /z/etc/modprobe.d/zfs.conf
echo "options zfs zfs_arc_max=$((256*1024*1024))" >> /z/etc/modprobe.d/zfs.conf
chroot /z/ add-apt-repository universe 
chroot /z/ apt update 
chroot /z/ apt install zfs-initramfs
chroot /z/ update-initramfs -c -k all 
chroot /z/ update-grub 
chroot /z/ grub-install /dev/sda
for d in dev/pts dev proc sys run ; do umount /z/$d ; done

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Original code:

add-apt-repository universe && apt update && apt install zfs-initramfs
zpool create -o ashift=12 -O mountpoint=none ... && zpool export os && zpool import -R /z os -d /dev/disk/by-id && zfs create -o mountpoint=/ os/linux
rsync -aHSXAx /target/ /z/ && for d in dev dev/pts proc sys run ; do mount -o bind /{,z/}$d ; done
echo "Make sure zfs module doesn't eat half your RAM, adjust as you want but don't make them equal"; echo "options zfs zfs_arc_min=$((128*1024*1024))" >> /z/etc/modprobe.d/zfs.conf ; echo "options zfs zfs_arc_max=$((256*1024*1024))" >> /z/etc/modprobe.d/zfs.conf
chroot /z/ add-apt-repository universe && chroot /z/ apt update && chroot /z/ apt install zfs-initramfs
chroot /z/ update-initramfs -c -k all && chroot /z/ update-grub && chroot /z/ grub-install /dev/sda
for d in dev/pts dev proc sys run ; do umount /z/$d ; done