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.
Valeri
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 ++++++++++++++++++++++++++++++++++++++++