[CentOS] LUKS question

Tue Dec 12 15:20:22 UTC 2017
Valeri Galtsev <galtsev at kicp.uchicago.edu>

On Tue, December 12, 2017 9:06 am, Christian, Mark wrote:
> On Tue, 2017-12-12 at 09:41 -0500, Wells, Roger K. wrote:
>> I have existing systems with un-encrypted disks.
>> I have tried unsuccessfully to encrypt them using LUKS.
>> Has anyone out there been able to encrypt an existing system (after the
>> fact, so to speak)?
> Using cryptsetup to create a LUKS encrypted disk will wipe all the data on
> an
> existing disk.

This is easy to understand if one considers them as layers: and you can
not sneak anything underneath existing layer, you can only put next layer
on top of existing (first is without second is with encryption):

physical or virtual disk --> filesystem

physical or virtual disk --> encryption layer --> filesystem

I hope, this helps.


> Mark
>> TIA
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Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247