First create a file "swapfile" with the input file of /dev/zero and the output file of "swapfile"
Byte Size is 1 gig and the loop count is 1, so it will create a file that is 1 GB.
Create the file:
dd if=/dev/zero of=swapfile bs=1G count=1
Then we permission it:
chmod 600 swapfile
Format it:
mkswap swapfile
And turn it on!:
swapon swapfile