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I have get informed on how prepare a LUKS system & partitions, giving a key/passphrase, etc. But for a new fresh install of linux.

How to encrypt an already installed/configured linux system ?

EDIT I have made my linux system as a server. I need it crypted, and I would like to test encryption without to reinstall anything.

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    Unless it's LVM all data has to be moved to make room at the beginning for the LUKS header (2MiB). So it's not a straightforward / risk-free process. Tell us more about your setup (Partitions/RAID/LVM/...) Jul 31, 2015 at 9:10
  • @frostschutz Thanks (you could post it as an answer). It's not LVM. I had to clone it to a machine with LVM. Or backup, erase disk with LVM and clone it back... That's my question here: unix.stackexchange.com/questions/219447/…
    – ArchiT3K
    Jul 31, 2015 at 9:18

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Make another partition (or image file) with an encrypted fs for your data. Moving root on the fly to an encrypted fs on the same disk does not work.

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