Re: LUKS question

[Chris Murphy]

On Mon, Dec 18, 2017 at 3:28 PM, Gordon Messmer
 wrote:
> On 12/18/2017 06:14 AM, Michael Cronenworth wrote:
> > > Everything possible even on the / filesystem while the system runs
> > > normally.
> >
> > All of what you describe is possible without LVM, too.
>
> Including moving the filesystem while the system using it is live?  I'm not
> aware of a non-LVM way to do that.

Btrfs does, but in the context of the current thread it's out of scope
because it also assumes the file system you want to encrypt is already
Btrfs. If so, it's pretty simple:

cryptsetup luksFormat /dev/B
cryptsetup open /dev/B newroot
btrfs dev add /dev/mapper/newroot /
btrfs dev rem /dev/A /