Use case: One creates a cloud VM with minimal RAM and your service is being killed because it just needs some more. There’s only one partition on the disk attached so here we go:
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$ sudo fallocate -l 1g /mnt/1GiB.swap
$ sudo chmod 600 /mnt/1GiB.swap
$ sudo mkswap /mnt/1GiB.swap
Setting up swapspace version 1, size = 1048576 kB
$ sudo swapon /mnt/1GiB.swap
$ cat /proc/swaps
Filename Type Size Used Priority
/home/swapfile file 1048576 1048576 -1
$ echo '/mnt/4GiB.swap swap swap defaults 0 0' | sudo tee -a /etc/fstab
$ reboot
$ free -h
total used free shared buff/cache available
Mem: 15G 9.3G 454M 4.0G 5.8G 1.9G
Swap: 1.0G 1.0G 0B
