I find myself needing to do this all the time and have to go search for a good artcile to remember all the commands. I often go back to this article to help me remember how to do it. For the sake of brevity I am just writing down the commands needed. Please read over the full article to understand what you are doing.
Now that we have enabled swap we need to make sure it persist when we reboot. To do this edit the
/etc/fstab file and add the following line: