User Tools

Site Tools


Access encrypted lvm disk from live cd

Installing ubunto on an encrypted lvm partition is easy using the ubuntu alternate cd.

However, accessing your data in case of emergency using a life cd needs some additional steps

  1. Boot from live cd
sudo modprobe dm-crypt                      # Inserts a module we need
sudo cryptsetup luksOpen /dev/sda2 cheer   # Unlocks the partition sda2 and names it cheer
Enter LUKS passphrase: 
key slot 0 unlocked.
sudo apt-get install lvm2  # installs the tools we need
sudo modprobe dm-mod       # inserts a module we need
sudo vgscan                # Scans for all volume groups
  Reading all physical volumes.  This may take a while...
  Found volume group "Ubuntu" using metadata type lvm2
sudo vgchange -a y Ubuntu  # this made the VG Ubuntu active, if you don't give it a volume group as an argument it'll make them  all active        
sudo lvscan                # This command lists the logical volumes and their /dev path
  ACTIVE            '/dev/Ubuntu/Root' [15.00 GB] inherit
  ACTIVE            '/dev/Ubuntu/swap' [1.00 GB] inherit
  ACTIVE            '/dev/Ubuntu/home' [215.89 GB] inherit
# Now I mount them to do whatever it is I need to do, if you wanted to run a fsck on them you obviously wouldn't mount them.
sudo mkdir /media/root; sudo mkdir /media/home
sudo mount /dev/Ubuntu/Root /media/root; sudo mount /dev/Ubuntu/home /media/home
# Now to reverse the process and unmount everything
sudo umount /media/root; sudo umount /media/home
sudo rmdir /media/root; sudo rmdir /media/home
sudo vgchange -a n Ubuntu 
sudo cryptsetup luksClose cheer


blog/access_encrypted_lvm_disk_from_live_cd.txt · Last modified: 2012/09/22 18:13 by brb