Creates a 4 gig swap file and mounts it as swap space, used for EC2 small instances for on-boot ephemeral swap space, put it somewhere in boot init

ephemswap

#!/bin/bash

if swapon -s | grep -q /mnt/swapfile
then
    echo "Swapfile already mounted"
else
    if [ -e /mnt/swapfile ]
    then
	echo "Mounting swapfile"
        swapon /mnt/swapfile
    else
	echo "Creating swapfile"
        dd if=/dev/zero of=/mnt/swapfile bs=1M count=4096
        mkswap /mnt/swapfile
        swapon /mnt/swapfile
    fi
fi

cd /usr/sbin
curl -O https://raw.github.com/gist/2131510/9df83283df1cdf876d8faa107c16721f6ea93a24/ephemswap
chmod +x ephemswap