Amazon EC2 script to assign multiple public IPs automatically to box in VPC

associate_ips.bash

#!/bin/bash
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi


MAC_ADDR=$(ifconfig eth0 | sed -n 's/.*HWaddr \([a-f0-9:]*\).*/\1/p')
IP=($(curl http://169.254.169.254/latest/meta-data/network/interfaces/macs/$MAC_ADDR/local-ipv4s))
for ip in ${IP[@]:1}; do
    echo "Adding IP: $ip"
    ip addr add dev eth0 $ip/24
done


echo "Public IPs are now:"
curl http://169.254.169.254/latest/meta-data/network/interfaces/macs/$MAC_ADDR/public-ipv4s | tee our_public_ips.txt


echo