add swapfile to ubuntu host

gistfile1.txt

#Original article: https://www.digitalocean.com/community/tutorials/how-to-add-swap-on-ubuntu-12-04

dd if=/dev/zero of=/swapfile bs=1M count=1k
mkswap /swapfile
swapon /swapfile
echo '/swapfile       none    swap    sw      0       0 ' >> /etc/fstab
echo 1 | tee /proc/sys/vm/swappiness
echo vm.swappiness = 1 | tee -a /etc/sysctl.conf
chown root:root /swapfile
chmod 0600 /swapfile