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# encrypt swap Ubuntu 20.04 with hibernation
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## prerequisite
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* all command bellow are run has root
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* install ecryptfs
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~~~{bat}
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root@laptop:/root# install apt-get install ecryptfs-utils
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~~~
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## encrypt swap
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* turn off current swap
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~~~
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root@laptop:/root# swapoff -a
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~~~
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* encrypt swap partition
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~~~
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root@laptop:/root# cryptsetup luksFormat --cipher aes-xts-plain64 --verify-passphrase --key-size 256 /dev/nvme0n1p2
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root@laptop:/root# cryptsetup open /dev/nvme0n1p2 cryptswap
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~~~
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* set up the crypt partition as swap.
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~~~
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root@laptop:/root# mkswap /dev/mapper/cryptswap
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~~~
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* ajust **/etc/fstab** to use your mapper, replace your encrypt swap device like bellow :
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~~~
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/dev/mapper/cryptswap none swap discard 0 0
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~~~
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* add your encrypt swap device define in **/etc/crypttab**
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~~~
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cryptswap /dev/nvme0n1p2 none luks
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~~~
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* enable swap
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~~~
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root@laptop:/root# swapon -a
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~~~
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* edit **/etc/initramfs-tools/conf.d/resume**. Replace the existing **RESUME** line with the following line.
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~~~
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root@laptop:/root# printf "RESUME=/dev/mapper/cryptswap" | tee /etc/initramfs-tools/conf.d/resume
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~~~
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* Register these changes.
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~~~
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root@laptop:/root# update-initramfs -u -k all
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~~~
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* Change your /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT to point to remove or be sure there is nothing in resume
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GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
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~~~
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root@laptop:/root# update-grub
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~~~
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### to be solve
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~~~
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cryptsetup: ERROR: Couln't resolve device rpool/ROOT/ubuntu_...
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cryptsetup: WARNING: Couln't determine root device
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~~~
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## sources
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* [wiki.archlinux.org - dm-crypt/Swap encryption](https://wiki.archlinux.org/index.php/Dm-crypt/Swap_encryption#LVM_on_LUKS)
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* [help.ubuntu.com - Enable Hibernate With Encrypted Swap](https://help.ubuntu.com/community/EnableHibernateWithEncryptedSwap)
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# encrypt swap Ubuntu 20.04 with hibernation
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## prerequisite
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* all command bellow are run has root
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* install ecryptfs
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~~~{bat}
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root@laptop:/root# install apt-get install ecryptfs-utils
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~~~
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## encrypt swap
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* turn off current swap
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~~~
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root@laptop:/root# swapoff -a
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~~~
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* encrypt swap partition
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~~~
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root@laptop:/root# cryptsetup luksFormat --cipher aes-xts-plain64 --verify-passphrase --key-size 256 /dev/nvme0n1p2
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root@laptop:/root# cryptsetup open /dev/nvme0n1p2 cryptswap
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~~~
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* set up the crypt partition as swap.
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~~~
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root@laptop:/root# mkswap /dev/mapper/cryptswap
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~~~
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* ajust **/etc/fstab** to use your mapper, replace your encrypt swap device like bellow :
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~~~
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/dev/mapper/cryptswap none swap discard 0 0
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~~~
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* add your encrypt swap device define in **/etc/crypttab**
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~~~
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cryptswap /dev/nvme0n1p2 none luks
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~~~
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* enable swap
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~~~
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root@laptop:/root# swapon -a
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~~~
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* edit **/etc/initramfs-tools/conf.d/resume**. Replace the existing **RESUME** line with the following line.
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~~~
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root@laptop:/root# printf "RESUME=/dev/mapper/cryptswap" | tee /etc/initramfs-tools/conf.d/resume
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~~~
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* Register these changes.
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~~~
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root@laptop:/root# update-initramfs -u -k all
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~~~
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* Change your /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT to point to remove or be sure there is nothing in resume
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GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
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~~~
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root@laptop:/root# update-grub
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~~~
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### to be solve
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~~~
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cryptsetup: ERROR: Couln't resolve device rpool/ROOT/ubuntu_...
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cryptsetup: WARNING: Couln't determine root device
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~~~
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~~~
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- don't work anymore after upgrade form 20.04 to 21.04 on Full ZFS with zfs encrypt and encrypted swap but still work if swap is unencrypted.
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- just test it sucessfully again (12.2021) on a 20.04 Full ZFS with zfs unencrypt and encrypted swap.
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~~~
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## sources
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* [wiki.archlinux.org - dm-crypt/Swap encryption](https://wiki.archlinux.org/index.php/Dm-crypt/Swap_encryption#LVM_on_LUKS)
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* [help.ubuntu.com - Enable Hibernate With Encrypted Swap](https://help.ubuntu.com/community/EnableHibernateWithEncryptedSwap)
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