02-17-2012
I understand, but you chopped out a bit too much, and forgot to explain any of your logic...
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LEARN ABOUT CENTOS
systemd-cryptsetup
SYSTEMD-CRYPTSETUP@.SERVICE(8) systemd-cryptsetup@.service SYSTEMD-CRYPTSETUP@.SERVICE(8)
NAME
systemd-cryptsetup@.service, systemd-cryptsetup - Full disk decryption logic
SYNOPSIS
systemd-cryptsetup@.service
/usr/lib/systemd/systemd-cryptsetup
DESCRIPTION
systemd-cryptsetup@.service is a service responsible for setting up encrypted block devices. It is instantiated for each device that
requires decryption for access.
systemd-cryptsetup@.service will ask for hard disk passwords via the password agent logic[1], in order to query the user for the password
using the right mechanism at boot and during runtime.
At early boot and when the system manager configuration is reloaded this /etc/crypttab is translated into systemd-cryptsetup@.service units
by systemd-cryptsetup-generator(8).
SEE ALSO
systemd(1), systemd-cryptsetup-generator(8), crypttab(5), cryptsetup(8)
NOTES
1. password agent logic
http://www.freedesktop.org/wiki/Software/systemd/PasswordAgents
systemd 208 SYSTEMD-CRYPTSETUP@.SERVICE(8)