Setting up a SWAP file on Digital Ocean

A SWAP file is a space on a hard disk used as the virtual memory extension of a computer’s real memory (RAM).
Having a swap file allows your computer’s operating system to pretend that you have more RAM than you actually do.

Digital Ocean Full Guides

SWAP on VPS
SWAP on Ubuntu

Quick Setup Guide

1. free
2. cd /var
3. touch swap.img
4. chmod 600 swap.img
5. dd if=/dev/zero of=/var/swap.img bs=1024k count=1000
6. mkswap /var/swap.img
7. swapon /var/swap.img
8. echo “/var/swap.img none swap sw 0 0” » /etc/fstab
9. reboot

Log in again and check status is changed with “free” command like in step 1.