[dm-crypt] Need help with sync'ing dmsetup info to disk

Arno Wagner arno at wagner.name
Wed Jul 13 14:51:19 CEST 2011


The first question would be: What did you change?
Also, tbis liiks like a problem with dmsetup, not
cryptsetup. 

More info needed:
- What Distribution?
- What configuration?
- What did you do immediately before ot borke? Nay updated?

Arno

On Tue, Jul 12, 2011 at 05:30:38PM +0200, Johann Burkard wrote:
> Hello,
> 
> I have a big problem with one of my machines: Upon booting, there
> are no entries in /dev/mapper and the system doesn't start. It looks
> like this:
> 
> ls -l /dev/mapper
> crw------- 1 10, 59 control
> 
> Fortunately, I was able to read the dmsetup tables from a backup of
> the disk. They look like this:
> 
> sda2_crypt: 0 234241709 crypt twofish-cbc-essiv:sha256
> 0000000000000000000000000000000000000000000000000000000000000000 0
> 8:2 2056
> data-drive: 0 216662016 linear 252:0 17572224
> data-swap: 0 17571840 linear 252:0 384
> 
> Now, I tried a Ubuntu live CD to restore them. I edited the table
> definitions to point to /dev/sda2 (which is the crypto partition)
> and called dmsetup create sda2_crypt ..., dmsetup create data-drive
> ..., dmsetup create data-swap ...
> 
> However, once I reboot into the original OS on the disk, the entries
> are gone again.
> 
> When I try to create the entries with dmsetup in the initrd, I get
> this error:
> 
> (initramfs) dmsetup create sda2_crypt --table '0 1234....'
> device-mapper: reload ioctl failed: Invalid argument
> Command failed
> 
> How can I save the dmsetup tables to disk from the Ubuntu live CD?
> 
> Thanks for any help.
> 
> Johann
> _______________________________________________
> dm-crypt mailing list
> dm-crypt at saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt
> 

-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno at wagner.name 
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