How to add hibernation to Arch Linux using a swapfile

hibernation.md

1. Run as root

sudo su

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2. Create swap file

Note: set count to your RAM capacity + 2, eg 8GB RAM so count=10

dd if=/dev/zero of=/swapfile bs=1G count=10 status=progress
chmod 600 /swapfile
mkswap /swapfile 
echo "/swapfile none swap sw 0 0" | tee -a /etc/fstab
mount -a
swapon -a

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3. Find the swap device

This will be referred to as SWAP_DEVICE later on

findmnt -no UUID -T /swapfile

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4. Find the swap file offset

This will be referred to as SWAP_FILE_OFFSET later on

filefrag -v /swapfile | awk '{ if($1=="0:"){print substr($4, 1, length($4)-2)} }'

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5. Configure GRUB

nano /etc/default/grub

On line GRUB_CMDLINE_LINUX_DEFAULT Append in the speech marks:

resume=UUID=SWAP_DEVICE resume_offset=SWAP_FILE_OFFSET

Exit and save

Update GRUB

grub-mkconfig -o /boot/grub/grub.cfg

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6. Configure the initial ramdisk

nano /etc/mkinitcpio.conf

On HOOKS=(base udev ... filesystems fsck) After filesystems add resume Example:

HOOKS=(base udev ... filesystems resume fsck)

Exit and save

Generate initial ramdisk

mkinitcpio -P

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7. Reboot

shutdown now -r