[Solved] Mount LUKS encrypted hard drive at boot

Hi,
This is driving me nuts. I'm getting angry to be honest.
I encrypted my brand new WD portable hard drive with LUKS + dm-crypt and I can now normally map and mount it with the following commands:
sudo cryptsetup luksOpen /dev/sdc1 WesternDigital
[Enter Passphrase]
sudo mount /dev/mapper/WesternDigital /media/WesternDigital
I would like to map and mount it at boot time (where I should be prompted for the passphrase), so I edited:
/etc/crypttab
WesternDigital /dev/sdc1 none luks
and:
/etc/fstab
/dev/mapper/WesternDigital /media/WesternDigital ext4 defaults,noauto,noatime 0 0
During boot I get some errors regarding the decrypting or mapping of WesternDigital that fails but it's too fast to note down something (and, as you probably know, there's no known way to log boot messages on Arch...)
After boot if I try to manually mount /media/WesternDigital I get a message saying /dev/mapper/WesternDigital does not exist.
So I guess the problem is in the mapping phase and thus in the /etc/crypttab file.
I can't find anything in the internet but maybe I'm missing something very basic (a daemon, a module?).
Any help is indeed very appreciated, thank you.
Last edited by rent0n (2010-09-24 15:27:16)

Ok, it's solved. I tried many different configurations of /etc/crypttab, /etc/fstab, /etc/mkinitcpio.conf /etc/rc.conf /boot/grub/menu.lst and I finally found the right setup.
I'm not sure of what was wrong in the first place so I'll just post my current working configs for future reference.
/boot/grub/menu.lst
Doesn't need to be edited at all (ignore the above post).
/etc/rc.conf
You don't need to add any module here because the dm-crypt and dm-mod modules are loaded thanks to the encrypt hook.
/etc/mkinitcpio.conf
The HOOKS line should include usb, usbinput (probably) and encrypt. usb must precede encrypt that must precede filesystems:
HOOKS="base udev autodetect pata scsi sata usb usbinput keymap encrypt filesystems resume"
/etc/crypttab
WesternDigital /dev/sdX ASK
Do not insert 'luks', 'retry=X' or other kind of options (you can find this kind of options in many tutorials and howtos). That was one of my problems I guess.
/etc/fstab
/dev/mapper/WesternDigital /media/WesternDigital auto defaults,noatime 0 0
Note
I'm not sure if this has been helpful or not... however I was able to get it to work after following the advice found here.
Cheers,

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