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Michel Le Cocq 2021-12-08 20:56:05 +01:00
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encrypt-swap-Ubuntu-20.04.md

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