Assign me a VIP

#!/bin/sh

VIP=$1
IF=$2

# Determine the interface's MAC address
MAC=`ip link show $IF | awk '/ether/ {print $2}'`

# Determine ENI ID of the interface
ENI_ID=`curl http://169.254.169.254/latest/meta-data/network/interfaces/macs/$MAC/interface-id`

# Set the current region as default
export AWS_DEFAULT_REGION=`curl http://169.254.169.254/latest/meta-data/placement/availability-zone | rev | cut -c 2- | rev`

aws ec2 assign-private-ip-addresses\
         --network-interface-id $ENI_ID\
         --private-ip-addresses $VIP\
         --allow-reassignment