Re: [dm-crypt] reinstallation

[RaMaier@gmx.de]

When I just enter 
cryptsetup luksOpen /dev/sda2 tresor 
I get the reply:
Command failed: No setup backend available

I guess it somehow has a relation to the mapper.
Any idea ?

Best regards
Rainer


-------- Original-Nachricht --------
> Datum: Tue, 11 Aug 2009 23:42:29 +0200
> Von: Arno Wagner <arno@wagner.name>
> An: RaMaier@gmx.de
> Betreff: Re: [dm-crypt] reinstallation

> I suspect luksFormat wipes the LUKS superblock and creates
> a new one, i.e. all data is permanently lost. mkfs.ext3
> will overwrote the filesystem metadata, i.e. the filesystem
> structure is lost.
> 
> However 
> > cryptsetup luksOpen /dev/sda2 tresor
> > mount /dev/mapper/tresor /tresor
> 
> should work, with sda2 replaced with whatever the 
> LUKS container now is in. Basically you just do what you
> did before to access (not create) the device, just 
> with a (potentially) different device identifier.
> 
> As to preventing partition loss, make a sector-wise
> backup copy, e.g. with dd or dd_rescue before risking it.
> 
> Arno
> 
> On Tue, Aug 11, 2009 at 11:25:16PM +0200, RaMaier@gmx.de wrote:
> > Hi Hannes,
> > in the documents I keep. I found that I had encrypted /dev/sda2. The
> procedure I recorded was:
> > umount /dev/sda2
> > cryptsetup luksFormat /dev/sda2
> > cryptsetup luksOpen /dev/sda2 tresor
> > mkfs.ext3 /dev/mapper/tresor
> > mount /dev/mapper/tresor /tresor
> > 
> > What will happen if I repeat the steps ?
> > Should I just leave the mkfs.ext3 out ?
> > Would I be able to access my old data again ?
> > What does lufsFormat really do ? Format the partition ?
> > As I staded the data is pretty valuable to me.
> > 
> > thanks for your help.
> > Best regards
> > Rainer
> > 
> > 
> > -------- Original-Nachricht --------
> > > Datum: Tue, 11 Aug 2009 16:01:56 +0200
> > > Von: Hannes Erven <h.e@gmx.at>
> > > An: Rainer Maier <RaMaier@gmx.de>
> > > CC: dm-crypt@saout.de
> > > Betreff: Re: [dm-crypt] reinstallation
> > 
> > > Hi Rainer,
> > > 
> > > 
> > > > How can I reinstall LUKS on my new Debian (Lenny)?
> > > 
> > > I guess the debian (and thus cryptsetup) installations on your old
> > > machine weren't that up to date, right?
> > > 
> > > With the new debian lenny, you don't need to install anything: LUKS is
> > > already included in the default cryptsetup package you should already
> > > have installed (http://packages.debian.org/lenny/cryptsetup ).
> > > 
> > > >>From http://code.google.com/p/cryptsetup/:
> > > "The former version of cryptsetup only had low-level operations for
> > > dm-crypt ready, and around version cryptsetup-luks 1.0.5 was renamed
> to
> > > be the official version of cryptsetup. "
> > > 
> > > You still might have to change your old scripts, if you have some, to
> > > just call cryptsetup instead of cryptsetup-luks .
> > > 
> > > 
> > > HTH, best regards
> > > 
> > > 	-hannes
> > > 
> > > 
> > > 
> > > _______________________________________________
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> > > dm-crypt@saout.de
> > > http://www.saout.de/mailman/listinfo/dm-crypt
> > 
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> 
> -- 
> Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email:
> arno@wagner.name 
> GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25
> 338F
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