hibernate_from_a_non_activate_swapfile_from_btrfs
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hibernate_from_a_non_activate_swapfile_from_btrfs [2020/12/16 09:05] – memeruiz | hibernate_from_a_non_activate_swapfile_from_btrfs [2021/02/01 05:55] (current) – external edit 127.0.0.1 | ||
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====== Hibernate from a non activate swapfile from btrfs ====== | ====== Hibernate from a non activate swapfile from btrfs ====== | ||
+ | |||
+ | *** Important! *** This didn't work! It is not secure! When wiping happens, the file gets moved to another place by btrfs, then, this doesn' | ||
+ | |||
+ | * This was just a stupid experiment. | ||
===== Create swapfile ===== | ===== Create swapfile ===== | ||
Line 11: | Line 15: | ||
- | UUID=8f9ede3a-912f-40d6-9335-90ed3186e3e4 | + | UUID=8f9ede3a-912f-40d6-9335-90ed3186e3e4 |
* Be sure there is no discard nor autodefrag options activated for this subvolume | * Be sure there is no discard nor autodefrag options activated for this subvolume | ||
Line 58: | Line 62: | ||
===== Configure system for hibernation ===== | ===== Configure system for hibernation ===== | ||
- | | + | |
+ | * Create / | ||
+ | |||
+ | RESUME=UUID=8f9ede3a-912f-40d6-9335-90ed3186e3e4 resume_offset=1121793 | ||
+ | |||
+ | * Modify / | ||
+ | |||
+ | GRUB_CMDLINE_LINUX_DEFAULT=" | ||
+ | |||
+ | * Activate the swap file | ||
+ | |||
+ | sudo swapon / | ||
+ | |||
+ | | ||
+ | * Edit / | ||
+ | |||
+ | resume device = / | ||
+ | early writeout = y | ||
+ | image size = 0 | ||
+ | RSA key file = / | ||
+ | shutdown method = platform | ||
+ | resume offset = 1121793 | ||
+ | |||
+ | * Activate a systemd service: | ||
+ | |||
+ | sudo systemctl edit systemd-hibernate.service | ||
+ | |||
+ | * With: | ||
+ | |||
+ | [Service] | ||
+ | ExecStart= | ||
+ | ExecStartPre=-/ | ||
+ | ExecStart=/ | ||
+ | ExecStartPost=-/ | ||
+ | |||
+ | * Update initramfs and grub | ||
+ | |||
+ | sudo update-grub | ||
+ | sudo update-initramfs -k all -u | ||
+ | sudo update-grub | ||
+ | |||
+ | * Test the hibernation: | ||
+ | |||
+ | sudo s2disk | ||
+ | |||
+ | I have a system with encrypted swap, but I don't want to have encryption on the hibernation swap file. My idea is to use hibernation only when strictly necessary, because I don't want to need to put a password during booting. | ||
+ | |||
+ | # | ||
+ | |||
+ | echo " | ||
+ | sudo swapon / | ||
+ | sleep 1 | ||
+ | echo " | ||
+ | sleep 0.2 | ||
+ | xtrlock -b & | ||
+ | sudo s2disk | ||
+ | echo " | ||
+ | sleep 10 | ||
+ | echo " | ||
+ | sudo swapoff / | ||
+ | sleep 5 | ||
+ | echo " | ||
+ | #sudo wipe -k -f -q -Q 1 / | ||
+ | sudo dd if=/ | ||
+ | sync | ||
+ | sleep 1 | ||
+ | echo " | ||
+ | sudo mkswap / | ||
+ | echo "All done, ready to hiberante again" | ||
+ | |||
+ | ===== References ===== | ||
+ | |||
+ | |||
+ | https:// | ||
+ | |||
+ | https:// | ||
+ | |||
+ | https:// | ||
+ | |||
+ | https:// | ||
+ | |||
+ | https:// | ||
+ | |||
+ | https:// | ||
+ | |||
+ | https:// | ||
+ | |||
+ | |||
hibernate_from_a_non_activate_swapfile_from_btrfs.1608109502.txt.gz · Last modified: 2021/02/01 05:55 (external edit)