Aws Elastic IP roller script

eip-roller.sh

#!/bin/bash

region=YOUR REGION HERE

# Get a new Eip
allocated_eip=$(aws --region $region ec2 allocate-address --output table | perl -lne 'print $& if /(\d+\.){3}\d+/')

# Get the current Eip
old_ip=$(curl -s ident.me)

# Get instance id
instance_id=$(curl -s http://169.254.169.254/latest/meta-data/instance-id)

# Associate the new Eip
aws --region $region ec2 associate-address --instance-id $instance_id --public-ip $allocated_eip

# Get old ip association id
allocation_id=$(aws --region $region ec2 describe-addresses --public-ip $old_ip --query Addresses[].AllocationId --output text | tr -d '\n')

# Release the old eip
aws --region $region ec2 release-address --allocation-id $allocation_id