Mount a LUKS partition at boot

I have installed an Ubuntu machine with two encrypted LUKS partitions: one for / and one for /home.

I've reinstalled the machine to upgrade to 10.04. Again, the / is installed using LUKS, and I'm able to mount the /home using:

mkdir /media/home
sudo cryptsetup luksOpen /dev/sda2 home
sudo mount -t ext3 /dev/mapper/home /media/home

The problem is, this cryptfs mapper disappears after boot, so I putting the appropriate line in fstab fails.

How do I set the cryptfs to prompt for password and unlock the drive at boot?

Thanks,

Adam

Seems that I needed to edit the /etc/crypttab file, which is the crypto equivalent to fstab, and add the following line:

# create a /dev/mapper device for the encrypted drive
home    /dev/sda2       none luks

And add the following to /etc/fstab:

# /home LUKS
/dev/mapper/home /home ext4 rw 0 0

Now I get two password prompts at boot, as needed.