centos - LUKS encryption with non-interactive login on RHEL6

I need to have LUKS encryption on this system but during lab development I don't want to have to enter the password at the console each reboot. I'd like a way to set a simple password that can be passed and then later removed once the system is deployed.

http://atterer.org/linux-remove-disable-luks-encryption-password-on-disk-partition-crypttab-initrd

I found the above method but it's for debian and the paths don't exist. I tried to put a script with echo -n password that was executable as /boot/passphrase then updated /etc/crypttab to have keyscript=/boot/passphrase and it's not working.

Has anyone found a working method in fedora/RHEL6?

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