Re: failure booting lvm volume group over encrypted disk
On Jan 2, 8:30 pm, Towncat <towncat.town...@gmail.com> wrote:
> On Jan 2, 6:50 pm, "Douglas A. Tutty" <dtu...@porchlight.ca> wrote:
>
>
>
> > On Wed, Jan 02, 2008 at 08:29:30AM -0800, Towncat wrote:
> > > On Jan 1, 11:00 pm, Towncat <towncat.town...@gmail.com> wrote:
> > > > I'm trying to make a bootable backup disk based on <a href=http://
> > > > linuxgazette.net/140/kapil.html>this howto</a>.
>
> > > > The backup is on an external usb-sata drive. There is an sdc1
> > > > partition that is not used, a small sdc2 for boot, unencrypted, and an
> > > > sdc3 encrypted. On this there is a volume group, with two lv-s, one
> > > > for root and one for swap.
>
> > > > When booting the original system, I can open the encrypted disk, but I
> > > > need to restart lvm for the system to find the volume group on it. I
> > > > can also mount the lv-s.
>
> > > > When I try to boot the backup system, it loads the initramfs, and I
> > > > get this message:
>
> > > > /dev/mapper/vg_externalsata_2-root does not exist.
>
> > > > Looking at /proc/modules shows that the dm_crypt module is not loaded
> > > > (although it seems to be included in the initramfs), which I think
> > > > might be the problem.
>
> > > > Any ideas? Did someone use the same howto with success?
>
> > > Anyone have a hint maybe? I don't even have a clue where to look for
> > > the error...
>
> > What is it you hope this backup disk to do? Why can't you use the
> > debian-install CD in rescue mode to boot up the system in the event of a
> > boot failure? Why do backups need to be bootable? Personally, I put
> > my backups in a tarball (spit to fit on each piece of media) and pipe it
> > through openssl to encrypt it.
>
> The point is not the backup, but the encrypted system. The howtohttp://linuxgazette.net/140/kapil.html
> proceeds by first making an encrypted clone of your system (which is,
> as a byproduct, also a bootable backup), and then transfers that
> backup to the original but by then encrypted system disk. However, if
> I cannot make the encrypted backup bootable, then I won't be able to
> do the same with the original system on the original disk.
>
> Actually, I tried the lenny installer (netinst) to produce an
> encrypted root system, but I ran into the same problem, that's why I
> started over by hand.
>
> As I said, the problem seems to be that the initramfs does not load
> the crypt modules and does not do the unencyrpt procedure (even though
> the modules are included in the initramfs).
>
> Thanks,
> Tc
>
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FYI all,
I figured out the problem, it was my mistake, because the initramfs
was actually OK, but I had too boot partitions (one for the original
system, one for the backup), and I was updating the wrong one (and
booting from the other...) Once I figured out, it did work -- now I
have another issue.
Tc
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