Quick HOWTO : Steps to create swap file in Linux

Step 1:

Create the file.

This file will be 1024*524288 bytes. Generally it is a good
idea to create the swap file twice as big as the amount of
RAM that you have installed if you are under a 1 GB.

However, if you have larger amounts of RAM, it's best to run
your own tests with free to see how you're using the swap

$ dd if=/dev/zero of=/swapfile0 bs=1024 count=524288

Step 2:

Setup the swap area on the file you created.

$ mkswap /swapfile0

Step 3:

Enable the file for swapping

$ swapon /swapfile0

Step 4:

Permanently enable the swap file on boot.
Add the following lines to /etc/fstab.

/swapfile0 swap swap defaults 0 0

Step 5:

Check that the swap file is working the the free command. Also,
reboot too to make sure the swap file works on restart and that
/etc/fstab was correctly configured.

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