[dm-crypt] Can't boot

Arno Wagner arno at wagner.name
Sun Nov 3 20:28:57 CET 2013

On Sun, Nov 03, 2013 at 18:55:07 CET, merc1984 at f-m.fm wrote:
> I can't figure out how to subscribe to the list, so I hope that just
> sending is OK.

Subscription info is at the bottom of 
> I've installed SolydX (Debian), but it won't boot.  It never asks me for
> sda3's password, and after a bit always drops me to (initramfs), saying
> that no root disk was found.  Indeed there is no /dev/mapper/sda3_crypt.

Sounds like SolydX just does not support root-on-LUKS. Or maybe
you just did not configure it right. But that the installer does
not support encryption is a dead giveaway.

Best complain there, not here. Booting to encrypted disk is
somethign the distribution has to handle, not cryptsetup.
If you plan to fix this yourself, just make sure cryptsetup
and all required libraries are on the initrd, the kernel
has the required modules in the initrd. Then open the device
with cryptsetup and mount it. Next steps are documented here:


under "Changing the root device". You can try this manually
from the shell you get in the initramfs to figure out what
is wrong.


> For some reason, on boot it is not setting up the luks disk.  My method
> below works just fine for a SolydK install (KDE), but not for a SolydX
> install (XFCE).
> The installer does not support encryption, so I installed it to
> partitions:
> /boot /dev/sda1 200MB ext3
> / /dev/sda4 1.8TB jfs
> While still in the SolydX live DVD:
> # cryptsetup luksFormat /dev/sda3
> # cryptsetup luksOpen /dev/sda3 sda3_crypt
> # mkfs.jfs /dev/mapper/sda3_crypt
> # mkdir /media/3
> # mount /dev/mapper/sda3_crypt /media/3
> Now I copied everything from sda4 (the / install) to sda3
> # rsync --archive --hard-links --numeric-ids --progress
> /media/solydxk/???/* 3
> 	# cd /media/3/etc
> 	In /etc/crypttab (which doesn't exist in SolydX until I create
> 	it, in contrast with SolydK which has one):
> 		sda3_crypt      /dev/sda3       none    luks
> 	In fstab:
> 		/dev/mapper/sda3_crypt  /       jfs    
> 		errors=remount-ro,noatime       0 1
> 	# mount /dev/sda1 /media/3/boot
> 	# cd /media/3
> 	# mount -t proc proc proc/
> 	# mount -t sysfs sys sys/
> 	# mount -o bind /dev dev/
> 	# mount -t devpts pts dev/pts/
> 	# chroot /media/3 /bin/bash
> 	In /etc/initramfs-tools/modules:
> 		dm_mod 
> 		dm_crypt 
> 		aes_x86_64 
> 	Then
> 		# which cryptsetup
> 		/usr/bin/cryptsetup
> 		# update-initramfs -k all -u
> 		# nano /etc/default/grub  and add to
> 			ipv6-disable=1 
> 		# update-grub
> -- 
> http://www.fastmail.fm - Same, same, but different...
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Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno at wagner.name
GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
There are two ways of constructing a software design: One way is to make it
so simple that there are obviously no deficiencies, and the other way is to
make it so complicated that there are no obvious deficiencies. The first
method is far more difficult.  --Tony Hoare

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