From: Milan Broz <gmazyland@gmail.com>
To: David Christensen <dpchrist@holgerdanske.com>, dm-crypt@saout.de
Subject: Re: [dm-crypt] Debian 7.10 random key swap Device /dev/sda2 is not a valid LUKS device.
Date: Wed, 6 Apr 2016 07:38:15 +0200 [thread overview]
Message-ID: <5704A0C7.2040707@gmail.com> (raw)
In-Reply-To: <57048FA2.7090008@holgerdanske.com>
On 04/06/2016 06:25 AM, David Christensen wrote:
> dm-crypt:
>
> I have a Debian 7.10 (Wheezy) computer with a random-key swap device.
> The disk and swap are working.
>
>
> When I try to backup the LUKS header:
>
> # cryptsetup luksHeaderBackup /dev/sda2 --header-backup-file
> luksheaderbackup-sda2.bin
> Device /dev/sda2 is not a valid LUKS device.
>
>
> Is this expected/ normal behavior for a dm-crypt/ LUKS random-key swap
> partition?
LUKS device cannot be used with random volume key, so I guess you use
just plain device without header. (So obviously header backup fails because
there is no header.)
You can verify it by checking entry in /etc/crypttab - no luks keyword:
> # grep sda2 /etc/fstab
> /dev/mapper/sda2_crypt none swap
or running "cryptsetup status sda2_crypt" over unlocked device
(type is LUKS1 for LUKS devices)
Milan
next prev parent reply other threads:[~2016-04-06 5:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-06 4:25 [dm-crypt] Debian 7.10 random key swap Device /dev/sda2 is not a valid LUKS device David Christensen
2016-04-06 5:38 ` Milan Broz [this message]
2016-04-06 5:59 ` David Christensen
2016-04-06 6:37 ` Milan Broz
2016-04-06 10:55 ` Michael Kjörling
2016-04-06 19:35 ` David Christensen
2016-04-06 20:26 ` Sven Eschenberg
2016-04-06 23:06 ` David Christensen
2016-04-07 9:39 ` Arno Wagner
2016-04-07 9:46 ` Arno Wagner
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