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 >> > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos > ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++