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wiki-system/encrypt-swap-Ubuntu-20.04.md

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encrypt swap Ubuntu 20.04 with hibernation

prerequisite

  • all command bellow are run has root
  • install ecryptfs
install apt-get install ecryptfs-utils

encrypt swap

  • turn off current swap
swapoff -a
  • encrypt swap partition
cryptsetup luksFormat --cipher aes-xts-plain64 --verify-passphrase --key-size 256 /dev/nvme0n1p2
cryptsetup open /dev/nvme0n1p2 cryptswap
  • set up the crypt partition as swap.
mkswap /dev/mapper/cryptswap
  • ajust /etc/fstab to use your mapper, replace your encrypt swap device like bellow :
/dev/mapper/cryptswap   none   swap   discard   0   0
  • add your encrypt swap device define in /etc/crypttab
cryptswap   /dev/nvme0n1p2		none	luks
  • enable swap
swapon -a
  • edit /etc/initramfs-tools/conf.d/resume. Replace the existing RESUME line with the following line.
printf "RESUME=UUID=/dev/mapper/cryptswap" | tee /etc/initramfs-tools/conf.d/resume
  • Register these changes.
update-initramfs -u -k all

to be solve

cryptsetup: ERROR: Couln't resolve device rpool/ROOT/ubuntu_...
cryptsetup: WARNING: Couln't determine root device

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