On 20 February 2010 03:55, Jonas Meurer
<jonas@freesources.org> wrote:
hey sven,
On 17/02/2010 Selim Levy wrote:
> The cause:
> During the CD installation of debian, the debian installer associates the
> external hard drive to /dev/sdb. However, following the installation, when
> I boot *from* the external hard drive, the system associates it with
> /dev/sda. So essentially, I'm installing linux (and dm-crypt and everything
> else) to /dev/sdb, though it will then be called /dev/sda when I boot from
> it.
>
> The question:
> I've already made the necessary changes to GRUB and the /boot partition is
> booting properly -- I can get a busybox prompt -- but I'm unable to continue
> booting into the root partition. Where are the files on /boot located that
> must be changed in order for the boot partition to properly deal with the
> dm-crypt encrypted LVM volume group? I have already found the
> conf/conf.d/cryptroot file within my initrd image and have modified both
> lines in it. (One line is for the root partition, the other for swap.)
> I've modified the 'target=' and the 'source=' entries (on both llines) to
> show 'sda3' as opposed to the original 'sdb3'. What else must be changed?
you need to change both /etc/crypttab and /etc/fstab on the rescue
system, and maybe even /etc/initramfs-tools/conf.d/resume.
afterwards you'll have to regenerate the initramfs image. the best way
to do so is to:
- unlock and mount the rootfs of your rescue system to /mnt/rescue
- copy /proc/modules, /proc/cmdline and /proc/devices to
/mnt/rescue/proc
- bind-mount /dev to /mnt/rescue/dev: 'mount -o bind /dev /mnt/rescue/dev'
- chroot into /mnt/rescue/dev
- modify /proc/cmdline, /etc/crypttab and /etc/fstab
- run 'update-initramfs -u'
Just in case I had screwed things up myself prior to your reply and my new attempts, I reinstalled Debian lenny onto the external USB drive (which I call "rescue" or "external").
I booted back into my internal drive and attempted all of your recommendations on the external drive:
<output for following omitted because no errors>
# cryptsetup luksOpen /dev/sdc3 rescue
# vgchange -a y rescue
# mount /dev/rescue/rooto /mnt/RootRescue/
# mount /dev/sdc2 /mnt/RootRescue/boot/
# mount -o bind /dev /mnt/RootRescue/dev
However, when I get to updating my initramfs, I get the following error:
# chroot /mnt/RootRescue/ /usr/sbin/update-initramfs -u
update-initramfs: Generating /boot/initrd.img-2.6.26-2-amd64
cryptsetup: WARNING: invalid line in /etc/crypttab -
cryptsetup: WARNING: invalid line in /etc/crypttab -
The contents of the rescue's /etc/crypttab, for which I've tried various things is:
# cat crypttab
sdb3_crypt /dev/sdb3 none luks
I wonder whether my problem is related to which drive gets /dev/sdx designation based upon which one booted. When booted on my usual/internal drive and with /dev still bind-mounted (above), I have /mnt/RootRescue/dev/sda and ..../sdc well populated. Nothing about sdb. When I try to boot from the external drive, I get lots of sdb output (particularly if I boot into "rescue" mode). Don't know if that helps any...
Thanks in advance for your assistance.
Cheers,
S