Hibernate using a swap file

OS:

Ubuntu 18.04

Before you begin

I tried the following on 18.04 with and without a swap partition (the following assumes you have a swap file). I couldn’t get it to work due to random issues until I upgraded to 19.04. The following are only for reference. Please refer to the following working examples instead:

• [Optional] Shrink parition
• Create a swap parition
• Configure hibernate using swap parition

Configure GRUB

sudo findmnt -no SOURCE,UUID -T /swapfile

/dev/nvme0n1p2 5c056ca5-14ee-4c9a-b3c7-87f0c6998d8f

sudo swap-offset /swapfile

resume offset = 36827136

Update /etc/default/grub:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=5c056ca5-14ee-4c9a-b3c7-87f0c6998d8f resume_offset=36827136"

sudo update-grub

USWSUSP

Userspace software suspend. This relies on a tool called s2disk.

sudo apt install uswsusp

# I said NO to continuing without a valid swap space

Update /etc/uswsusp.conf (requires update-initramfs):

resume device = /dev/nvme0n1p2

# to

resume device = /dev/disk/by-uuid/5c056ca5-14ee-4c9a-b3c7-87f0c6998d8f

The following needs to be done since we made changes to /etc/uswsusp.conf

sudo update-initramfs -u -k all

Updated systemd hibernate service:

sudo systemctl edit systemd-hibernate.service

with the following content:

[Service]
ExecStart=
ExecStartPre=-/bin/run-parts -v -a pre /lib/systemd/system-sleep
ExecStart=/usr/sbin/s2disk
ExecStartPost=-/bin/run-parts -v --reverse -a post /lib/systemd/system-sleep

References

https://askubuntu.com/a/1132154 https://askubuntu.com/questions/6769/hibernate-and-resume-from-a-swap-file

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• Tag: linux