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Landcy
n00b
Joined: 05 Jan 2024
Posts: 3
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 Posted: Sat Jan 06, 2024 7:20 am Post subject: Grub can't find root Partition. |
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First time installing Gentoo so please excuse my ignorance.
At boot Grub outputs the following error.
| Code: | error: no such device: a4a82cef-570e-42e9-97cc-8d1a3ad529a4
error: unknown filesystem
entering rescue mode...
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For some important context I've only encrypted my rootfs (following this page on the wiki), I'm using the distribution kernel and and I'm using openrc.
Here's my partition layout and the output of blkid as well as any other files that I thought may be relevant.
| Code: | livecd / # lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 423.9M 1 loop
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 1G 0 part /efi
├─sda2 8:2 0 4G 0 part
└─sda3 8:3 0 926.5G 0 part
└─root 252:0 0 926.5G 0 crypt /
sdb 8:16 1 115.7G 0 disk
├─sdb1 8:17 1 246K 0 part
├─sdb2 8:18 1 2.8M 0 part
├─sdb3 8:19 1 462.7M 0 part
└─sdb4 8:20 1 300K 0 part
zram0 253:0 0 0B 0 disk
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| Code: |
/dev/sdb3: BLOCK_SIZE="2048" LABEL="ISOIMAGE" TYPE="hfsplus" PARTLABEL="HFSPLUS" PARTUUID="511fff52-b47e-49b4-bc8d-61c9a4fce718"
/dev/loop0: TYPE="squashfs"
/dev/mapper/root: UUID="a4a82cef-570e-42e9-97cc-8d1a3ad529a4" BLOCK_SIZE="512" TYPE="xfs"
/dev/sda3: UUID="e3354f20-b4cc-42ca-91bf-95add58664cf" TYPE="crypto_LUKS" PARTUUID="be368159-270e-d44c-8cce-f6ad76dd7c81"
/dev/sda1: UUID="538F-1852" BLOCK_SIZE="512" TYPE="vfat" PARTUUID="0da13249-2fef-774f-9571-fdc37fc3b20a"
/dev/sdb4: PARTLABEL="Gap1" PARTUUID="511fff52-b47e-49b4-bc8a-61c9a4fce718"
/dev/sdb1: PARTLABEL="Gap0" PARTUUID="511fff52-b47e-49b4-bc8f-61c9a4fce718"
/dev/sda2: PARTUUID="857cd234-9932-6542-84eb-40982a78bf20"
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/etc/dracut.conf.d/luks.conf
| Code: | add_dracutmodules+=" crypt dm rootfs-block "
kernel_cmdline+=" root=UUID=a4a82cef-570e-42e9-97cc-8d1a3ad529a4 rd.luks.uuid=e3354f20-b4cc-42ca-91bf-95add58664cf "
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/etc/default/grub
| Code: |
GRUB_DISTRIBUTOR="Gentoo"
GRUB_CMDLINE_LINUX="crypt_root=UUID=a4a82cef-570e-42e9-97cc-8d1a3ad529a4 root=/dev/mapper/root "
GRUB_CMDLINE_LINUX_DEFAULT="root=/dev/sda3"
GRUB_DISABLE_LINUX_PARTUUID=false |
/etc/fstab
| Code: | PARTUUID=0da13249-2fef-774f-9571-fdc37fc3b20a /efi vfat defaults 0 2
/dev/sda2 none swap sw 0 0
/dev/mapper/root / xfs defaults,noatime 0 1
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/efi/grub/grub.cfg
| Code: |
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
insmod luks
if [ -s $prefix/grubenv ]; then
load_env
fi
if [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entry
set boot_once=true
else
set default="0"
fi
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
else
menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function load_video {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
}
if [ x$feature_default_font_path = xy ] ; then
font=unicode
else
insmod xfs
search --no-floppy --fs-uuid --set=root a4a82cef-570e-42e9-97cc-8d1a3ad529a4
font="/usr/share/grub/unicode.pf2"
fi
if loadfont $font ; then
set gfxmode=auto
load_video
insmod gfxterm
fi
terminal_output gfxterm
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
set timeout=5
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/10_linux ###
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/30_uefi-firmware ###
menuentry 'UEFI Firmware Settings' $menuentry_id_option 'uefi-firmware' {
fwsetup
}
### END /etc/grub.d/30_uefi-firmware ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg
fi
### END /etc/grub.d/41_custom ###
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I've also ran:
| Code: | | rc-update add dmcrypt boot |
I'm assuming the issue is that the root directory isn't decrypted by the time grub attempts to mount the device. Well, the solution is obviously to decrypt /dev/sda3 but I don't get prompted to enter the passphrase anytime during boot, its this that I'm at a loss for. I'm not sure what I've configured wrong and what the solution out of this is.
So if anyone can help get me on the right track it would be very appreciated.
Thank you |
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CaptainBlood
Advocate
Joined: 24 Jan 2010
Posts: 3672
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| Posted: Sat Jan 06, 2024 8:21 am Post subject: |
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Unsure if related, No crypted fs here.
René Rebe from T2 distribution did a debug session for grub-2.12 decryption issue.
EDIT:Not so easy to follow, strong german aceent, and a LOT of rant in this perticular video.
EDIT:IIRC it's iniyially a build issue, then tries to cancel a late patch...
Thks 4 ur attention, interest & support.
_________________
USE="-* ..." in /etc/portage/make.conf here, i.e. a countermeasure to portage implicit braces, belt & diaper paradigm
LT: "I've been doing a passable imitation of the Fontana di Trevi, except my medium is mucus. Sooo much mucus. "
Last edited by CaptainBlood on Sat Jan 06, 2024 9:36 am; edited 1 time in total |
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sMueggli
Guru
Joined: 03 Sep 2022
Posts: 380
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| Posted: Sat Jan 06, 2024 9:34 am Post subject: |
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As far as I can see, you do not use an unencrypted /boot. But I have the impression, that you want an unencrypted /boot (your /efi has 1 GB, which makes sense if you use the EFI System Partition as /boot).
It is possible to have an encrypted /boot, but this requires Grub to be able to decrypt the LUKS container and that is currently not the case. Therefore it cannot find the device with a4a82cef-...
Do you want full disk encryption or almost full disk encryption (with unencrypted /boot)? |
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Landcy
n00b
Joined: 05 Jan 2024
Posts: 3
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| Posted: Sat Jan 06, 2024 10:01 am Post subject: |
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| Quote: | | Do you want full disk encryption or almost full disk encryption (with unencrypted /boot)? |
Correct. I didn't want to attempt full disk encryption for this install and so only root (/dev/sda3) has been encrypted. At least to my knowledge. You say you don't see an unencrypted /boot (or /efi which is what I am using as my /boot) but I can mount and read the contents of the boot partition from the livecd without having to use cryptsetup to decrypt it. This is not the case for /dev/sda3 or the root partition. Please correct me if I've misinterpreted your words.
| Code: | livecd / # mount /dev/sda1 /mnt/gentoo/
livecd / # ls /mnt/gentoo/
EFI grub initramfs.img
livecd / # mount /dev/sda3 /mnt/rotfs/
mount: /mnt/rotfs: unknown filesystem type 'crypto_LUKS'.
dmesg(1) may have more information after failed mount system call.
livecd / # lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 423.9M 1 loop /mnt/livecd
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 1G 0 part /mnt/gentoo
├─sda2 8:2 0 4G 0 part
└─sda3 8:3 0 926.5G 0 part
sdb 8:16 1 115.7G 0 disk /mnt/cdrom
├─sdb1 8:17 1 246K 0 part
├─sdb2 8:18 1 2.8M 0 part
├─sdb3 8:19 1 462.7M 0 part
└─sdb4 8:20 1 300K 0 part
zram0 253:0 0 0B 0 disk |
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sMueggli
Guru
Joined: 03 Sep 2022
Posts: 380
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| Posted: Sat Jan 06, 2024 10:23 am Post subject: |
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| Landcy wrote: | You say you don't see an unencrypted /boot (or /efi which is what I am using as my /boot) but I can mount and read the contents of the boot partition from the livecd without having to use cryptsetup to decrypt it. This is not the case for /dev/sda3 or the root partition. Please correct me if I've misinterpreted your words.
| Code: | livecd / # mount /dev/sda1 /mnt/gentoo/
livecd / # ls /mnt/gentoo/
EFI grub initramfs.img
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The mountpoint /efi is meant to mount your ESP (EFI System Partition). The ESP does normally store only the bootloader part. The bootloader is now under /efi/EFI/gentoo/grubx64.efi and can be loaded by the firmware at boot time.
Your ESP (/efi) further contains a folder "grub" which contains parts that are used by Grub, before your kernel is loaded. And there is also a initramfs.
But your kernel is still located under /boot which is part of your / partition and is encrypted.
Maybe the easiest is to delete /efi/grub and /efi/initramfs.img. Then unmount /efi and change the mountpoint of the ESP to /boot instead of /efi (changing /etc/fstab) and remount the ESP (now under /boot). Then install Grub again (with emerge and also grub-install), install also the kernel and initramfs again.
If your /boot contains now the directories "EFI" and "grub" and also the kernel and initramfs files, you can recreate your grub.cfg again. |
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Landcy
n00b
Joined: 05 Jan 2024
Posts: 3
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| Posted: Sat Jan 06, 2024 11:55 am Post subject: |
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| Quote: | | But your kernel is still located under /boot which is part of your / partition and is encrypted. |
Ahhhh I think I understand better now what you were saying. I've done what you've suggested and everything works perfectly now, mostly. I'm getting mount error now related to that /dev/sda3 partition. I think maybe I configured something wrong with dracut its trying to mount /dev/sda3 instead of /dev/mapper/root. Anyway I think I can figure this one out on my own.
Thank you very much! |
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Installing Gentoo
