====== 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
  - 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
  

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