Make swap partition on amazon EC2 instance.

make_swap.sh

#!/bin/bash

# './make_swap -s 1024' will create a 1024 MB swap

OPTIND=1;

# Size in MB
s="1024";

while getopts "s:" opt; do
    case "$opt" in
    s)  s=$OPTARG
        ;;
    esac
done

shift $((OPTIND-1))

[ "$1" = "--" ] && shift

if grep -Fq "/var/swap" /etc/fstab
then
  echo "Swap already enabled for this machine.";
else
  # 1 GB
  sudo /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=$s
  sudo /sbin/mkswap /var/swap.1
  sudo chmod 600 /var/swap.1
  sudo /sbin/swapon /var/swap.1
  echo "/var/swap.1   swap    swap    defaults        0   0" | sudo tee -a /etc/fstab
fi