Using a swapfile to increase the swap space on your system

This can be a very handy function if we want to use a file, instead of a partition, and with modern filesystems the performance is almost on par with using a dedicated partition for your swap area.

1. Using dd lets make a zero’d file for the swap

This example would create a swapfile of 1 gig using a blocksize of a megabyte (1048576).

2. Make file as a swapfile

3. Activate swapfile

4. Verify that our swapfile has been activated

We should see something like this in the list ..
If you want to have this a permanent solution, then adding the entry to fstab would probally be a better idea,
open up /etc/fstab in your favourite editor and add the following line.