Leap 15.5 UEFI#

This guide can be used to install openSUSE Leap onto a single disk with or without ZFS encryption.

It assumes the following:

  • Your system uses UEFI to boot

  • Your system is x86_64

  • You're mildly comfortable with ZFS, EFI and discovering system facts on your own (lsblk, dmesg, gdisk, ...)

Download openSUSE Leap 15.5 , write it to a USB drive and boot your system in EFI mode.

Confirm EFI support:

# dmesg | grep -i efivars
[    0.301784] Registered efivars operations

Configure Live Environment#

Disable automounting#

gsettings set org.gnome.desktop.media-handling automount false

Switch to a root account#

sudo -i

Source /etc/os-release#

The file /etc/os-release defines variables that describe the running distribution. In particular, the $ID variable defined within can be used as a short name for the filesystem that will hold this installation.

source /etc/os-release
export ID

Enable filesystems repository#

zypper -n addrepo https://download.opensuse.org/repositories/filesystems/$(lsb_release -rs)/filesystems.repo
zypper refresh

Install updated ZFS packages#

zypper -n install zfs zfs-kmp-default
modprobe zfs

Generate /etc/hostid#

zgenhostid -f 0x00bab10c

Define disk variables#

For convenience and to reduce the likelihood of errors, set environment variables that refer to the devices that will be configured during the setup.

For many users, it is most convenient to place boot files (i.e., ZFSBootMenu and any loader responsible for launching it) on the the same disk that will hold the ZFS pool. However, some users may wish to dedicate an entire disk to the ZFS pool or create a multi-disk pool. A USB flash drive provides a convenient location for the boot partition. Fortunately, this alternative configuration is easily realized by simply defining a few environment variables differently.

Verify your target disk devices with lsblk. /dev/sda, /dev/sdb and /dev/nvme0n1 used below are examples.

First, define variables that refer to the disk and partition number that will hold boot files:

export BOOT_DISK="/dev/sda"
export BOOT_PART="1"

Next, define variables that refer to the disk and partition number that will hold the ZFS pool:

export POOL_DISK="/dev/sda"
export POOL_PART="2"

Disk preparation#

Wipe partitions#

zpool labelclear -f "$POOL_DISK"

wipefs -a "$POOL_DISK"
wipefs -a "$BOOT_DISK"

sgdisk --zap-all "$POOL_DISK"
sgdisk --zap-all "$BOOT_DISK"

Create EFI boot partition#

sgdisk -n "${BOOT_PART}:1m:+512m" -t "${BOOT_PART}:ef00" "$BOOT_DISK"

Create zpool partition#

sgdisk -n "${POOL_PART}:0:-10m" -t "${POOL_PART}:bf00" "$POOL_DISK"

ZFS pool creation#

Create the zpool#

zpool create -f -o ashift=12 \
 -O compression=lz4 \
 -O acltype=posixacl \
 -O xattr=sa \
 -O relatime=on \
 -o autotrim=on \
 -o compatibility=openzfs-2.1-linux \
 -m none zroot "$POOL_DEVICE"


The option -o compatibility=openzfs-2.1-linux is a conservative choice. It can be omitted or otherwise adjusted to match your specific system needs.

Binary releases of ZFSBootMenu are generally built with the latest stable release of ZFS. Future releases of ZFSBootMenu may therefore support newer feature sets. Check project release notes prior to updating or removing compatibility options and upgrading your system pool.

Create initial file systems#

zfs create -o mountpoint=none zroot/ROOT
zfs create -o mountpoint=/ -o canmount=noauto zroot/ROOT/${ID}
zfs create -o mountpoint=/home zroot/home

zpool set bootfs=zroot/ROOT/${ID} zroot


It is important to set the property canmount=noauto on any file systems with mountpoint=/ (that is, on any additional boot environments you create). Without this property, the OS will attempt to automount all ZFS file systems and fail when multiple file systems attempt to mount at /; this will prevent your system from booting. Automatic mounting of / is not required because the root file system is explicitly mounted in the boot process.

Also note that, unlike many ZFS properties, canmount is not inheritable. Therefore, setting canmount=noauto on zroot/ROOT is not sufficient, as any subsequent boot environments you create will default to canmount=on. It is necessary to explicitly set the canmount=noauto on every boot environment you create.

Export, then re-import with a temporary mountpoint of /mnt#

zpool export zroot
zpool import -N -R /mnt zroot
zfs mount zroot/ROOT/${ID}
zfs mount zroot/home

Verify that everything is mounted correctly#

# mount | grep mnt
zroot/ROOT/leap on /mnt type zfs (rw,relatime,xattr,posixacl)
zroot/home on /mnt/home type zfs (rw,relatime,xattr,posixacl)

Install Leap#

Enable software repositories#

zypper --root /mnt ar https://download.opensuse.org/distribution/leap/$(lsb_release -rs)/repo/non-oss non-oss
zypper --root /mnt ar https://download.opensuse.org/distribution/leap/$(lsb_release -rs)/repo/oss oss
zypper --root /mnt ar https://download.opensuse.org/update/leap/$(lsb_release -rs)/oss update-oss
zypper --root /mnt ar https://download.opensuse.org/update/leap/$(lsb_release -rs)/non-oss update-nonoss
zypper --root /mnt ar https://download.opensuse.org/repositories/filesystems/$(lsb_release -rs)/filesystems.repo
zypper --root /mnt refresh


Enter a to always trust the key.

Add base packages#

zypper --root /mnt install -t pattern enhanced_base

Add package management#

zypper --root /mnt install zypper yast2

Copy files into the new install#

rm /mnt/etc/resolv.conf
cp -L /etc/resolv.conf /mnt/etc
cp /etc/hostid /mnt/etc

Chroot into the new OS#

mount -t proc proc /mnt/proc
mount -t sysfs sys /mnt/sys
mount -B /dev /mnt/dev
mount -t devpts pts /mnt/dev/pts
chroot /mnt /bin/bash

Basic system configuration#

echo 'LANG=en_US.UTF-8' > /etc/locale.conf
echo 'YOURHOSTNAME' > /etc/hostname
echo -e '\tYOURHOSTNAME' >> /etc/hosts

ZFS Configuration#

Configure Dracut to load ZFS support#

cat << EOF > /etc/dracut.conf.d/zol.conf
add_dracutmodules+=" zfs "
omit_dracutmodules+=" btrfs "

Install kernel packages#

zypper -n install kernel-default kernel-firmware

Install ZFS#

zypper -n install zfs zfs-kmp-default

Build Kernel Modules#

dracut --regenerate-all --force

Install and configure ZFSBootMenu#

Set ZFSBootMenu properties on datasets#

Assign command-line arguments to be used when booting the final kernel. Because ZFS properties are inherited, assign the common properties to the ROOT dataset so all children will inherit common arguments by default.

zfs set org.zfsbootmenu:commandline="quiet rhgb" zroot/ROOT

Create a vfat filesystem#

mkfs.vfat -F32 "$BOOT_DEVICE"

Create an fstab entry and mount#

cat << EOF >> /etc/fstab
$( blkid | grep "$BOOT_DEVICE" | cut -d ' ' -f 2 ) /boot/efi vfat defaults 0 0

mkdir -p /boot/efi
mount /boot/efi

Install ZFSBootMenu#

Fetch a prebuilt ZFSBootMenu EFI executable, saving it to the EFI system partition:

mkdir -p /boot/efi/EFI/ZBM
curl -o /boot/efi/EFI/ZBM/VMLINUZ.EFI -L https://get.zfsbootmenu.org/efi

Configure EFI boot entries#

mount -t efivarfs efivarfs /sys/firmware/efi/efivars
zypper -n install efibootmgr
efibootmgr -c -d "$BOOT_DISK" -p "$BOOT_PART" \
  -L "ZFSBootMenu (Backup)" \

efibootmgr -c -d "$BOOT_DISK" -p "$BOOT_PART" \
  -L "ZFSBootMenu" \

See also

Some systems can have issues with EFI boot entries. If you reboot and do not see the above entries in your EFI selection screen (usually accessible through an F key during POST), you might need to use a well-known EFI file name. See Portable EFI for help with this. Your existing ESP can be used, in place of an external USB drive.

Refer to zbm-kcl.8 and zfsbootmenu.7 for details on configuring the boot-time behavior of ZFSBootMenu.

Prepare for first boot#

Exit the chroot, unmount everything#

umount -n -R /mnt

Export the zpool and reboot#

zpool export zroot