Create swap file on digitalocean ubuntu droplets

swap.sh

#/bin/sh

# Creates a 4Gb swap image on your Droplet
# @see https://www.digitalocean.com/community/tutorials/how-to-add-swap-on-ubuntu-14-04

if [ -f /swapfile ]; then
	echo "Swap file already exists."
else
	sudo fallocate -l 4G /swapfile
  sudo chmod 600 /swapfile
  sudo mkswap /swapfile
  sudo swapon /swapfile
  echo "/swapfile   none    swap    sw    0   0" >> /etc/fstab
  echo "vm.swappiness=30" >> /etc/sysctl.conf
  echo "vm.vfs_cache_pressure=50" >> /etc/sysctl.conf
  echo "Swap created and added to /etc/fstab for boot up."
fi