Auto Unlock Crypt LVM

#!/bin/bash
dd if=/dev/urandom of=/boot/keyfile bs=1024 count=4
chmod 0400 /boot/keyfile
cryptsetup -v luksAddKey /dev/sda3 /boot/keyfile
ls -l /dev/disk/by-uuid/

root@quangva-Vostro-3459:/home/quangva# ls -l /dev/disk/by-uuid/
total 0
lrwxrwxrwx 1 root root 10 Thg 1  8 14:35 26D4-3645 -> ../../sda1
lrwxrwxrwx 1 root root 10 Thg 1  8 14:35 4c4f6b87-66c1-495b-9dfd-a5eff8ffd032 -> ../../dm-1
lrwxrwxrwx 1 root root 10 Thg 1  8 14:35 7c229c4a-d978-446f-ae1c-ad3e28ce30df -> ../../sda2
lrwxrwxrwx 1 root root 10 Thg 1  8 14:35 87b0cbb3-907c-4ea6-a3a5-0731c72c478b -> ../../sda3
lrwxrwxrwx 1 root root 10 Thg 1  8 14:35 88d8ded4-03e4-4e74-89ba-9ea9d560309d -> ../../dm-2

vi /etc/crypttab

sda3_crypt UUID=87b0cbb3-907c-4ea6-a3a5-0731c72c478b none luks,discard

sda3_crypt UUID=87b0cbb3-907c-4ea6-a3a5-0731c72c478b /dev/disk/by-uuid/7c229c4a-d978-446f-ae1c-ad3e28ce30df:/keyfile luks,keyscript=/lib/cryptsetup/scripts/passdev

update-initramfs -u

mkinitramfs -o /boot/initrd.img-$(uname -r) $(uname -r)