Enable swap ec2

enable-swap-ec2.sh

# To add this extra space to your instance you type:

sudo /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
sudo /sbin/mkswap /var/swap.1
sudo /sbin/swapon /var/swap.1

# If you need more than 1024 then change that to something higher.

# To enable it by default after reboot, add this line to /etc/fstab:

/var/swap.1 swap swap defaults 0 0

# Source: http://stackoverflow.com/questions/17173972/how-do-you-add-swap-to-an-ec2-instance