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# Unrealistic (and frankly stupid) layout with a complex block device
# stack involving multi-device btrfs and btrfs subvolumes, LUKS-on-MD,
# MD-on-LUKS and LUKS-on-LVM incl. nested dm-crypt volumes:
# NAME TYPE MOUNTPOINTS
# vda disk
# ├─vda1 part
# ├─vda2 part /boot
# └─vda3 part
# ├─testvg-lv0 lvm
# │ └─testvg-lv0_crypt crypt [SWAP]
# └─testvg-lv1 lvm
# └─testvg-lv1_crypt crypt
# └─md0 raid1
# └─md0_crypt crypt /, /home, /usr, /var
# vdb disk
# └─testvg-lv1 lvm
# └─testvg-lv1_crypt crypt
# └─md0 raid1
# └─md0_crypt crypt /, /home, /usr, /var
# vdc disk
# └─md0 raid1
# └─md0_crypt crypt /, /home, /usr, /var
# vdd disk
# └─vdd_crypt crypt /, /home, /usr, /var
sfdisk --append /dev/vda <<-EOF
unit: sectors
start=$((64*1024*2)), size=$((128*1024*2)), type=${GUID_TYPE_Linux_FS}
start=$(((64+128)*1024*2)), type=${GUID_TYPE_LUKS}
EOF
udevadm settle
lvm pvcreate /dev/vda3
lvm pvcreate /dev/vdb
lvm vgcreate "testvg" /dev/vda3 /dev/vdb
lvm lvcreate -Zn --size 64m --name "lv0" "testvg"
lvm lvcreate -Zn --size 1024m --name "lv1" "testvg"
lvm vgchange -ay "testvg"
lvm vgmknodes
udevadm settle
echo -n "testvg-lv0_crypt" >/keyfile
cryptsetup open --batch-mode \
--type=plain \
--cipher="aes-xts-plain64" \
--key-size=256 \
--hash="sha256" \
-- "/dev/testvg/lv0" "testvg-lv0_crypt" </keyfile
udevadm settle
echo -n "testvg-lv1_crypt" >/keyfile
cryptsetup luksFormat --batch-mode \
--key-file=/keyfile \
--type=luks1 \
--pbkdf-force-iterations=1000 \
-- "/dev/testvg/lv1"
cryptsetup luksOpen --key-file=/keyfile --allow-discards \
-- "/dev/testvg/lv1" "testvg-lv1_crypt"
udevadm settle
mdadm --create /dev/md0 --metadata=default --level=1 --raid-devices=2 \
/dev/mapper/testvg-lv1_crypt /dev/vdc
udevadm settle
for d in md0 vdd; do
echo -n "${d}_crypt" >/keyfile
cryptsetup luksFormat --batch-mode \
--key-file=/keyfile \
--type=luks2 \
--pbkdf=argon2id \
--pbkdf-force-iterations=4 \
--pbkdf-memory=32 \
-- "/dev/$d"
cryptsetup luksOpen --key-file=/keyfile --allow-discards \
-- "/dev/${d}" "${d}_crypt"
udevadm settle
done
# create multi-device btrfs filesystem for the root FS; we list /dev/mapper/vdd_crypt
# first since it's smaller and we want data to span across both devices
mkfs.btrfs -d single /dev/mapper/vdd_crypt /dev/mapper/md0_crypt
# create subvolumes
mount -t btrfs -o compress=lzo,device=/dev/mapper/md0_crypt /dev/mapper/vdd_crypt "$ROOT"
btrfs subvol create "$ROOT/@"
btrfs subvol create "$ROOT/@usr"
btrfs subvol create "$ROOT/@var"
btrfs subvol create "$ROOT/@home"
umount "$ROOT"
# now mount the subvolumes
mount -t btrfs -o compress=lzo,device=/dev/mapper/md0_crypt,subvol="@" /dev/mapper/vdd_crypt "$ROOT"
for s in home usr var; do
mkdir -m0755 "$ROOT/$s"
mount -t btrfs -o compress=lzo,device=/dev/mapper/md0_crypt,subvol="@$s" /dev/mapper/vdd_crypt "$ROOT/$s"
done
mkdir "$ROOT/boot"
mke2fs -Ft ext2 -m0 /dev/vda2
mount -t ext2 /dev/vda2 "$ROOT/boot"
mkswap /dev/mapper/testvg-lv0_crypt
swapon /dev/mapper/testvg-lv0_crypt
# vim: set filetype=sh :
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