From 69382acb89f08a5e69e51fc0fc369bc6d480ba9f Mon Sep 17 00:00:00 2001
From: "nomad@wund" <nomad@neuronfarm.net>
Date: Wed, 8 Dec 2021 20:56:05 +0100
Subject: [PATCH] add somme comment

---
 encrypt-swap-Ubuntu-20.04.md | 167 ++++++++++++++++++-----------------
 1 file changed, 86 insertions(+), 81 deletions(-)

diff --git a/encrypt-swap-Ubuntu-20.04.md b/encrypt-swap-Ubuntu-20.04.md
index afed352..db1da34 100644
--- a/encrypt-swap-Ubuntu-20.04.md
+++ b/encrypt-swap-Ubuntu-20.04.md
@@ -1,81 +1,86 @@
-# encrypt swap Ubuntu 20.04 with hibernation
-
-## prerequisite
-
-* all command bellow are run has root
-* install ecryptfs
-
-~~~{bat}
-root@laptop:/root# install apt-get install ecryptfs-utils
-~~~
-
-## encrypt swap
-
-* turn off current swap
-
-~~~
-root@laptop:/root# swapoff -a
-~~~
-
-* encrypt swap partition
-
-~~~
-root@laptop:/root# cryptsetup luksFormat --cipher aes-xts-plain64 --verify-passphrase --key-size 256 /dev/nvme0n1p2
-root@laptop:/root# cryptsetup open /dev/nvme0n1p2 cryptswap
-~~~
-
-* set up the crypt partition as swap.
-
-~~~
-root@laptop:/root# 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
-
-~~~
-root@laptop:/root# swapon -a
-~~~
-
-* 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
-~~~
-
-* Register these changes.
-
-~~~
-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
-
-GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
-
-~~~
-root@laptop:/root# update-grub
-~~~
-
-### to be solve
-
-~~~
-cryptsetup: ERROR: Couln't resolve device rpool/ROOT/ubuntu_...
-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)
-* [help.ubuntu.com - Enable Hibernate With Encrypted Swap](https://help.ubuntu.com/community/EnableHibernateWithEncryptedSwap)
+# encrypt swap Ubuntu 20.04 with hibernation
+
+## prerequisite
+
+* all command bellow are run has root
+* install ecryptfs
+
+~~~{bat}
+root@laptop:/root# install apt-get install ecryptfs-utils
+~~~
+
+## encrypt swap
+
+* turn off current swap
+
+~~~
+root@laptop:/root# swapoff -a
+~~~
+
+* encrypt swap partition
+
+~~~
+root@laptop:/root# cryptsetup luksFormat --cipher aes-xts-plain64 --verify-passphrase --key-size 256 /dev/nvme0n1p2
+root@laptop:/root# cryptsetup open /dev/nvme0n1p2 cryptswap
+~~~
+
+* set up the crypt partition as swap.
+
+~~~
+root@laptop:/root# 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
+
+~~~
+root@laptop:/root# swapon -a
+~~~
+
+* 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
+~~~
+
+* Register these changes.
+
+~~~
+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
+
+GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
+
+~~~
+root@laptop:/root# update-grub
+~~~
+
+### to be solve
+
+~~~
+cryptsetup: ERROR: Couln't resolve device rpool/ROOT/ubuntu_...
+cryptsetup: WARNING: Couln't determine root device
+~~~
+
+~~~
+- 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.
+- 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)