Luks Encryption under Ubuntu
Copy a LUKS volume
This is how to copy a LUKS partition from back1 to back2. We assume the original device is already opened using:
cryptsetup luksOpen /dev/disk/by-uuid/dc861b6d-0113-4da8-9c74-23fb1e759195 back1
First create a LUKS partition (back2 on /dev/sdc1)
- Repartition drive with
sudo fdisk /dev/sdc
as a linux partition sudo cryptsetup luksFormat /dev/sdc1
Open the new LUKS device and copy data
sudo cryptsetup luksOpen /dev/sdc1 back2
sudo mkfs.ext4 /dev/mapper/back2
Close everything so we can start from scratch for the copying:
cryptsetup luksClose /dev/mapper/back1
cryptsetup luksClose /dev/mapper/back2
Copying
Find UUIDS using blkid
, then
cryptsetup luksOpen /dev/disk/by-uuid/dc861b6d-0113-4da8-9c74-23fb1e759195 back1
cryptsetup luksOpen /dev/disk/by-uuid/b6e6191b-673a-49c2-87b0-7a1a2d880bb1 back2
mount /dev/mapper/back1 /srv/back1
mount /dev/mapper/back2 /srv/back2
nohup rsync -Phav /srv/back1/ /srv/back2&
Mounting
Ubuntu
cryptsetup luksOpen /dev/disk/by-uuid/b6e6191b-673a-49c2-87b0-7a1a2d880bb1 back2
mount /dev/mapper/back2 /srv/back2
Windows using Ubuntu in Hyper-V.
- The trick here is you need to right click -> Disk Management -> (take drive offline).
- Then in Hyper-V, you go to Setting -> SCSI-Controller -> (add the drive as a physical drive)
- Use an External Virtual Switch to put the machine on the same subnet as your host and samba to share the drive
MacOS using Ubuntu in VMWare
- It took me a long time to figure out that you can only pass through the disk as a USB 3.0 disk and have to install Guest Additions from Preferences on VMWare.
- Use an Bridged Adapter to put the machine on the same subnet as your host and samba to share the drive
Mounting
You can mount the shared drive from a Ubuntu machine as follows
mount -t cifs //phwlnuc/back2 /srv/back2 -v -o username=phwl,uid=$(id -u),gid=$(id -g),iocharset=utf8,vers=3.0
Closing
umount /srv/back1
umount /srv/back2
cryptsetup luksClose /dev/mapper/back1
cryptsetup luksClose /dev/mapper/back2