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I made one big luks device and re-used it on my debian install, then I ran into some boot problems and I need to access the filesystem.

The problem is, I decrypt the luks device and when I try to mount the filesystem I can't. It happened on debian rescue and another system rescue cd. What am I missing here? Seems something simple.

root@sysresccd /root % mkdir /media/linux
root@sysresccd /root % cryptsetup luksOpen /dev/sda2 linux
Enter passphrase for /dev/sda2: 
root@sysresccd /root % fdisk -l

Disk /dev/sda: 1000.2 GB, 1000203804160 bytes, 1953523055 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00002616

/dev/sda1   *        2048      616447      307200   83  Linux
/dev/sda2          616448  1851971583   925677568   83  Linux
/dev/sda3      1851971584  1953521663    50775040    7  HPFS/NTFS/exFAT


...... **Luks \/**

Disk /dev/mapper/linux: 947.9 GB, 947891732480 bytes, 1851351040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005063d

        Device Boot      Start         End      Blocks   Id  System
/dev/mapper/linux1            2048    29102079    14550016   83  Linux
/dev/mapper/linux2        29102080  1851351039   911124480   83  Linux

There are 2 file systems under this luks device: / and /home

root@sysresccd /root % mount /dev/mapper/linux1 /media/linux 
mount: special device /dev/mapper/linux1 does not exist

Actually, when I press tab to auto complete there is no linux1 and linux2. What's wrong? I've mounted lvm's this way before and nothing likenthis happened.

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  • 1
    I assume you did an ls -a /dev/mapper to make sure? also, you talk about LUKS, but then you mention LVM. which one is it? these are not the same thing.
    – strugee
    Oct 24, 2013 at 2:55
  • No no, there is no lvm in this setup, i was talking about past installations/mounts. I think i didnt.. i tought i was targeting the right devices and was failing because of some module.
    – Roberto
    Oct 25, 2013 at 17:30

1 Answer 1

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It's unusual to have partitions on a LUKS device. The partition device may also be called linuxp1. If it's not there, you can use one of partx, kpartx, or losetup --partscan to make partition devices available. You can also map it manually using losetup --offset.

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  • I gave up and started another install, but thanks anyway, may be usefull in the future. I remember seeing linuxp1 when the boot failed, then i tought about fstab and initram. About partitions, i could be wrong, i dont know too much about luks and dm crypt thing, but, everytime i did setup a encrypted install, i could only make 1 ´´partition´´ per luks, if that make sense to you. This time was different, i activated the existing encrypted device manually and could make more than one.
    – Roberto
    Oct 25, 2013 at 16:52
  • Actually the boot failed because it couldnt find /dev/mapper/linuxp1 if im not mistaken. Well, too late, thank guys haha.
    – Roberto
    Oct 25, 2013 at 17:27
  • As I said, it's unusual to have partitions on a LUKS device in the first place. Unless you're using this LUKS device as a VM container, you'd usually go for LVM there.
    – frostschutz
    Oct 25, 2013 at 17:29
  • I used to do this, then i tought it was another layer of risk to deal when power failures happen, or im wrong? Happened sometimes and no problems, but who knows.
    – Roberto
    Oct 25, 2013 at 17:34
  • @Roberto what do you mean by "this"?
    – strugee
    Oct 25, 2013 at 20:55

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