grub2 and cryptsetup

Question

My root node is LUKS encrypted, and it uses a key file, instead of user input password to unlock it.

I know in Grub2, I can use

insmod cryptodisk
insmod luks
cryptomount -u <uuid>

But I have no idea how to use a key file to unlock the disk.

Answer 1

Try

insmod (hd0,1)/routeto/keyfile.file

change (hd0,1) (if necessary)and put the mounting point of the keyfile file system, sda or whatsoever...