Expand VirtualBox Debian encrypted disk

I have a VirtualBox machine with full disk encryption. The space for the root partition is almost finished.

Expand VirtualBox vdi size

Remove all snapshots or clone the machine. Make a backup copy.

Expand from command line

The command to resize the disk is

VBoxManage modifymedium <absolute path to file> --resize <size in MB>

If VBoxManage is not in PATH add the full path

"C:\Program Files\Oracle\VirtualBox\VBoxManage" modifymedium disk "D:\VirtualBox VMs\DebianBP Zap\DebianBP Zap.vdi" --resize 40000

Expand from VirtualBox GUI

• Open the application
• File -> Virtual Media Manager
• Click on Properties
• Select the disk
• Select the new size
• Click Apply

Live CD

• Download System rescue cd
• Attach the image to the virtual machine
• Boot
• Choose “start the graphical environment”

• Keymap for italian keyboard is 21

Resize

Original steps from stackexchange

Actual partitioning of sda is

• 1 256MB primary boot
• 2 32GB extended
  • 5 32GB logical

Modified steps for my partition layout

1. open the encrypted volume

   cryptsetup luksOpen /dev/sda5 crypt-volume

2. extend the partition

   parted /dev/sda
   resizepart 2 100%
   resizepart 5 100%
   quit

3. stop using the VG

   # display attributes of volume groups, the name zap-bp-vg is from the "VG Name"
   vgdisplay
   # deactivate the VG
   vgchange -a n zap-bp-vg

4. close the encrypted volume

   cryptsetup luksClose crypt-volume

5. open it again

   cryptsetup luksOpen /dev/sda5 crypt-volume

6. resize the LUKS volume to the available space

   cryptsetup resize crypt-volume

7. Activate the VG

   vgchange -a y zap-bp-vg

8. Resize the PV

   pvresize /dev/mapper/crypt-volume

9. Resize the LV for / to 100% of the free space

   # display attributes of a logical volume, the name /dev/zap-bp-vg/root is from the "LV Path"
   lvdisplay
   lvresize -l+100%FREE /dev/zap-bp-vg/root

10. check the fs

    # find the volume path
    ls /dev/mapper/
    e2fsck -f /dev/mapper/zap--bg--vg-root

11. resize the filesystem (automatically uses 100% free space)

    resize2fs /dev/mapper/zap--bg--vg-root

Reboot and remove the System rescue cd image.