Arch Linux

whomen

Member

Registered: 2018-02-05

Posts: 7

LVM on LUKS - partition confusion (efi) - boot error

hey,
after following the instructions in the wiki (installation, dm-crypt, GRUB etc.) the system doesn't boot anymore.
after turning on the machine (lenovo x1 carbon) i just get a black screen. after a few seconds it is switching to the 'boot menu'.
what is strange there: the boot menu still shows 'ubuntu' which was previously installed.

i followed the  "Dm-crypt/Drive preparation." (https://wiki.archlinux.org/index.php/Dm … reparation) manual.
partitioning the disk i was confused whether i should create an efi partition because in the "ESP" wiki it says:
'[..]in the main partition table of the disk, not under LVM' (https://wiki.archlinux.org/index.php/EF … _Partition)

my disk is partitioned as followig:

# lsblk

nvme0n1
|--nvme0n1p1  --- 1M
|--nvme0n1p2  --- 128M  ## (the \boot partition)
|--nvme0n1p2  --- 476G  ## (the encrypted part)
   |--cryptolvm
       |--myVol-swap ---  8G
       |--myVol-root ----- 15G
       |--myVol-home --  453 G

the wiki is a bit too compressed for my taste especially when it comes to the boot section.
i am mainly confused with
- partition with lvm on luks
- efi partition needed?
- grub installation
- systemd

i set the

/etc/default/grub

to:

GRUB_PRELOAD_MODULES="lvm"
GRUB_ENABLE_CRYPTODISC=y
GRUB_CMDLINE_LINUX="resume=/dev/mapper/myVol-swap"
GRUB_CMDLINE_LINUX="root=/dev/mapper/myVol-root"
GRUB_CMDLINE_LINUX="luks.uuid=<the uuid of the nvme0n1p3>"
GRUB_CMDLINE_LINUX="luks.name=<uuid of cryptolvm>=/dev/mapper/cryptolvm"
GRUB_CMDLINE_LINUX="luks.key=<path/to/key.key>"

the hooks in

/etc/mkinitcpio.conf

 HOOKS=(base systemd autodetect keyboard keymap sd-vconsole modconf block sd-encrypt sd-lvm2 filesystems fsck)

and i did

grub-install --target=i386-pc /dev/nvme0n1p2

that may be wrong.. (as well)?!

any clues are appreciated
thanks

Last edited by whomen (2018-02-05 13:10:05)

nl6720

The Evil Wiki Admin

Registered: 2016-07-02

Posts: 595

Re: LVM on LUKS - partition confusion (efi) - boot error

EFI System Partition is only required for UEFI booting, if you'll only boot in BIOS mode you do not require it.
Do want a setup similar to https://wiki.archlinux.org/index.php/Dm … .28GRUB.29 ?

# lsblk
...
|--nvme0n1p2  --- 128M  ## (the \boot partition)
...

Is nvme0n1p2 encrypted?

GRUB_PRELOAD_MODULES="lvm"
GRUB_ENABLE_CRYPTODISC=y
GRUB_CMDLINE_LINUX="resume=/dev/mapper/myVol-swap"
GRUB_CMDLINE_LINUX="root=/dev/mapper/myVol-root"
GRUB_CMDLINE_LINUX="luks.uuid=<the uuid of the nvme0n1p3>"
GRUB_CMDLINE_LINUX="luks.name=<uuid of cryptolvm>=/dev/mapper/cryptolvm"
GRUB_CMDLINE_LINUX="luks.key=<path/to/key.key>"

• Are multiple GRUB_CMDLINE_LINUX lines allowed? Try combining them in one.

• "luks.name=<uuid of cryptolvm>=/dev/mapper/cryptolvm" is wrong, it should be "luks.name=<uuid of cryptolvm>=cryptolvm".

• Use "rd.luks." instead of "luks." (see warning in https://wiki.archlinux.org/index.php/Dm … crypt_hook ) .

grub-install --target=i386-pc /dev/nvme0n1p2

You need to use `grub-install` on the disk not the partition: grub-install --target=i386-pc /dev/nvme0n1