===== Install arch linux with zfs root =====


  - Obtain latest ISO from archlinux.org and burn it to an ISO
  - Boot up and change / size  \  
    - mount a swap partition
    - mount -o remount,size=16G /run/archiso/cowspace
  - Add zfs support
    - <code>curl -s https://archzfs.leibelt.de/media/setup/init | bash</code>
    - <code>zgenhostid -f 0x00bab10c</code>
  - Partition Disk(s)
    - Create EFI partition<code>sgdisk -n "1:1m:+512m" -t "1:ef00" /dev/sda</code>
    - I suggest a swap partition large enough to hold RAM (my system has 16g) contents if you intend to use hibernate<code>sgdisk -n "2:0:+16g" -t "2:8200" /dev/sda</code>
    - Allocate the remainder to the ZFS pool<code>sgdisk -n "3:0:-10m" -t "3:bf00" /dev/sda</code>
  - Create the ZFS pool
    - I suggest using the partition UUID for the device name.<code>
root@archiso ~ # ls -l /dev/disk/by-partuuid|grep sda3 
lrwxrwxrwx 1 root root 10 Sep  2 10:21 1aea6cc8-8333-4d5c-a9e6-e0a51296391d -> ../../sda3
</code>
    - We will be using [[https://zfsbootmenu.org|zfsbootmenu]] which is currently using OpenZFS 2.3<code>
zpool create -f -o ashift=12 \
 -O compression=lz4 \
 -O acltype=posixacl \
 -O xattr=sa \
 -O relatime=on \
 -o autotrim=on \
 -o compatibility=openzfs-2.3-linux \
 -m none zroot /dev/disk/by-partuuid/1aea6cc8-8333-4d5c-a9e6-e0a51296391d
</code>
  - Export / Import the ZFS pool<code>zpool export zroot && zpool import -NR /mnt zroot</code>
  - Create the ZFS file systems including the home directory for the normal user account.<code>
zfs create -o mountpoint=none zroot/ROOT
zfs create -o mountpoint=/ -o canmount=noauto zroot/ROOT/arch
zfs mount zroot/ROOT/arch

zfs mount
zroot/ROOT/arch                 /mnt
</code>
  - Set up EFI and swap partitions<code>
mkfs.vfat -F32 /dev/sda1
mkswap /dev/sda2</code>
  - Install the system<code>pacstrap /mnt linux linux-headers linux-firmware base vim amd-ucode networkmanager sudo openssh rsync</code>
  - Populate the fstab<code>
echo "$(blkid /dev/sda1|cut -d\  -f2) /boot/efi vfat defaults 0 2" >> /mnt/etc/fstab
echo "$(blkid /dev/sda2|cut -d\  -f2) none swap defaults 0 0" >> /mnt/etc/fstab</code>
  - Move into the install
    - <code>arch-chroot /mnt</code>
  - Set up arch system
    - Time<code>ln -sf /usr/share/zoneinfo/America/New_York /etc/localtime
hwclock --systohc</code>
    - locale<code>sed -i 's/#\(en_US\.UTF-8\)/\1/' /etc/locale.gen
locale-gen
echo "LANG=en_US.UTF-8" > /etc/locale.conf</code>
    - vconsole<code>echo -e "KEYMAP=us\n#FONT=latarcyrheb-sun32" > /etc/vconsole.conf</code>
    - hostname/hosts<code>echo tas > /etc/hostname</code>
    - set root password<code>passwd root</code>
  - Create a normal user and add to sudoers/wheel group<code>useradd -G wheel some_user
passwd some_user
mkdir -p ~some_user && chown some_user ~some_user</code>
    - edit sudoers with visudo to uncomment one of the wheel stanzas<code>
EDITOR=vim visudo</code>
    - create home for some_user<code>mkdir -p ~some_user && chown some_user ~some_user</code>
    - su - some_user
  - Install paru<code>sudo pacman -S --needed base-devel git
git clone https://aur.archlinux.org/paru.git
cd paru
makepkg -si
</code>
  - Install zfs support<code>paru -S zfs-utils
paru -S zfs-dkms
</code>
  - exit to root<code>exit</code>
  - finish setup
    - <code>zgenhostid -f 0x00bab10c</code>
    - edit /etc/mkinitcpio.conf and modify the HOOKS line adding //resume// and //zfs//<code>
vim /etc/mkinitcpio.conf
grep ^HOOKS /etc/mkinitcpio.conf
HOOKS=(base udev autodetect microcode modconf kms keyboard keymap zfs consolefont block filesystems resume)
mkinitcpio -P</code>
    - fix up user home directories<code>rm -rf ~some_user; mv /root /_root</code>
    - set up services<code>systemctl disable zfs-import-cache.service
systemctl mask zfs-import-cache.service
systemctl enable zfs-import-scan.service zfs-mount.service zfs.target zfs-volumes.target zfs-import.target zfs-zed.service NetworkManager</code>
  - Set up the EFI and install zfsbootmenu<code>
zfs set org.zfsbootmenu:commandline="rw quiet" zroot/ROOT
mkdir /boot/efi
mount /boot/efi
mkdir -p /boot/efi/EFI/ZBM
curl -o /boot/efi/EFI/ZBM/VMLINUZ.EFI -L https://get.zfsbootmenu.org/efi
cp /boot/efi/EFI/ZBM/VMLINUZ.EFI /boot/efi/EFI/ZBM/VMLINUZ-BACKUP.EFI
pacman -S refind
refind-install
rm /boot/refind_linux.conf
cat << EOF >> /boot/efi/EFI/refind/refind_linux.conf

menuentry "zbm boot" {
    loader /EFI/ZBM/VMLINUZ.EFI
    options "quiet loglevel=0 zbm.skip"
}
menuentry "zbm menu" {
    loader /EFI/ZBM/VMLINUZ.EFI
    options "quiet loglevel=0 zbm.show"
}
menuentry "zbm backup menu" {
    loader /EFI/ZBM/VMLINUZ-BACKUP.EFI
    options "quiet loglevel=0 zbm.show"
}
EOF
</code>
  - Exit and reboot<code>
exit
umount -n -R /mnt
zpool export zroot
reboot
</code>
  - Finish up
    - Log in as root<code>
zfs create -o mountpoint=none zroot/homes
zfs create -o mountpoint=/root zroot/homes/root
zfs create -o mountpoint=/home/USER zroot/homes/USER
cp -r /etc/skel/. ~
cp -r /etc/skel/. ~some_user
chown -R some_user:some_user ~some_user
chmod 750 ~some_user
zfs snapshot zroot/ROOT/arch@initial
exit
</code>