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Rootfs over encrypted lvm

Revision as of 02:06, December 1, 2020 by Pnoecker (talk | contribs) (Encrypting the drive: label requires --type luks2)

This howto describes how to setup LVM, swap, and root with dmcrypt LUKS. It is a standalone installation walk through, based on the official installations finished product. boot is not encrypted.

Prepare the hard drive and partitions

  • List the device to be partitioned, mine is on /dev/sdc
root # lsblk -o name,size,label,partlabel


root # cgdisk /dev/sdc

delete everything.

Command:  new ↵
First sector: 
Last sector: +1M ↵
Hex Code: EF02 ↵
Enter name: BIOS Boot ↵

scroll down to large chunk of free space:

Command: new ↵
First sector: 
Last sector: +128M ↵
Hex Code: EF00 ↵
Enter name: BOOT ↵

scroll down to large chunk of free space:

Command: new ↵
First sector: 
Last sector: 
Hex Code:  8304 ↵
Enter name: FUNTOO ↵
Disk Drive: /dev/sdc
                            Size: 62333952, 29.7 GiB

Part. #     Size        Partition Type            Partition Name
            1007.0 KiB  free space
   1        1024.0 KiB  BIOS boot partition	  BIOS Boot
   2        256.0 MiB   EFI System                BOOT
   3        29.5 GiB    Linux x86-64 root (/)     FUNTOO
Command: write ↵
Command: quit ↵

Encrypting the drive

root # cryptsetup luksFormat --type luks2 --label=FUNTOO /dev/sdc3

Unlock the volume

Unlock the volume:

root #cryptsetup luksOpen /dev/sdc3 dmcrypt_root

Create logical volumes

root # pvcreate /dev/mapper/dmcrypt_root
root # vgcreate vg /dev/mapper/dmcrypt_root          
root # lvcreate -L2G --name swap vg
root # lvcreate -l 100%FREE --name root vg

Create a filesystem on volumes

root # mkfs.vfat -F 32 /dev/sdc2
root # fatlabel /dev/sdc2 "BOOT"
root # mkswap /dev/mapper/vg-swap
root # mkfs.ext4 /dev/mapper/vg-root

Mount your partitions

root # swapon /dev/mapper/vg-swap
root # mkdir /mnt/funtoo
root # mount /dev/mapper/vg-root /mnt/funtoo
root # mkdir  /mnt/funtoo/boot
root # mount /dev/sdc2 /mnt/funtoo/boot

Get Funtoo Gnome

You can pull your Subarches gnome tarball if you wish:

root # cd /mnt/funtoo
root # wget
root # tar --numeric-owner --xattrs --xattrs-include='*' -xpf *gnome* && rm -f *gnome*

Load Funtoo

  • expand your run tmpfs to be half of your ram:
root # mount -t tmpfs tmpfs /run
  • mount up:
root # cd /mnt/funtoo && mount -t proc none proc
mount --rbind /sys sys
mount --rbind /dev dev
mount --rbind /run run
  • chroot in:
root # cd /mnt/funtoo && env -i HOME=/root TERM=$TERM chroot . bash -l
  • Set yo password:
  • set yo hostname:
  • set cloudflare dns resolution for installing:
  • Set yo time zone:
root # passwd
root # echo 'hostname="crypto"' > /etc/conf.d/hostname
root # echo "nameserver" > /etc/resolv.conf
root # ln -sf /usr/share/zoneinfo/America/Detroit /etc/localtime
  • Deploy your fstab:
root # cat > /etc/fstab << "EOF"
LABEL=BOOT /boot vfat noauto,noatime 1 2
/dev/mapper/vg-swap none swap sw 0 0
/dev/mapper/vg-root / ext4 noatime,nodiratime,defaults 0 1
tmpfs /run tmpfs rw,nodev,nosuid 0 0
  • Deploy your crypttab:
root # echo "dmcrypt_root PARTLABEL=FUNTOO none luks,discard" >> /etc/crypttab
  • compile in ram:
root # echo 'PORTAGE_TMPDIR="/run"' > /etc/portage/make.conf
  • Sync:
root # ego sync
  • Deploy your ego profile:
root # ego profile mix-in encrypted-root
  • Deploy your package.use file:
root # cat > /etc/portage/package.use << "EOF"
sys-kernel/debian-sources lvm luks
sys-kernel/debian-sources-lts lvm luks
sys-boot/grub device-mapper
sys-fs/lvm2 static-libs
sys-kernel/genkernel cryptsetup
dev-libs/openssl static-libs
dev-libs/json-c static-libs
app-crypt/argon2 static-libs
dev-libs/popt static-libs
sys-fs/cryptsetup static
dev-libs/libgpg-error static-libs
sys-kernel/linux-firmware initramfs
  • merge stuff:
root # emerge grub haveged intel-microcode linux-firmware eix cryptsetup lvm2 debian-sources debian-sources-lts && emerge -vuND @world
  • add required services:
root # rc-update add device-mapper sysinit
root # rc-update add dmcrypt sysinit
root # rc-update add lvm sysinit
root # rc-update add haveged && rc-update add gpm && rc-update add busybox-ntpd
  • deploy dmtab:
root # dmsetup table >> /etc/dmtab

Bootloader Configuration



the bootloader configuration is untested with partlabel, but known working under uuid.

boot {
  generate grub
  default "Funtoo Linux"
  timeout 3
"Funtoo Linux" {
	kernel kernel[-v]
	initrd initramfs[-v]
  params += crypt_root=PARTLABEL=FUNTOO dolvm luks=yes real_root=/dev/mapper/vg-root ro rootfstype=ext4 resume=swap:/dev/mapper/vg-swap
root # ego boot update


  • Install grub in legacy mode:
root # grub-install --target=i386-pc /dev/sdc 
root # ego boot update

EFI from Legacy

  • manually make efi directory:
  • remount /dev/sdc2 to /boot/efi:
  • install efi images:
root # mkdir /boot/efi
root # mount /dev/sdc2 /boot/efi
root # grub-install --target=x86_64-efi /boot/efi

EFI from EFI

root #mount -o remount,rw /sys/firmware/efi/efivars
root #grub-install --target=x86_64-efi --efi-directory=/boot --bootloader-id="Funtoo Linux [GRUB]" --recheck /dev/sdc
root #ego boot update

Final steps

exit chroot, unmount, and close encrypted drive.

root # exit
root # swapoff /dev/dm-1
root # cd ..
root # umount -lR funtoo
root # vgchange -a n
root # cryptsetup luksClose dmcrypt_root


Change your LUKs-encrypted drive's passphrase

You may want to change your encrypted volume’s passphrase or password from time to time. To do so, run the following commands in the console as root:

root # cryptsetup luksChangeKey /dev/sdx3

You'll be prompted to enter in the existing passphrase first, then to enter in your new passphrase. You will not be asked to confirm your new passphrase, so be careful when running this operation.

Additional links and information