Automatically associate an elastic ip to the running ec2 instance

user-data

#! /bin/bash

allocation_id=<ALLOCATION_ID>
metadata=169.254.169.254/latest/meta-data

get-region() {
    curl -s http://$metadata/placement/availability-zone | awk '{
        print(substr($0, 0, length($0)-1))
    }'
}

get-instance() {
    curl -s http://$metadata/instance-id
}


aws configure set region $(get-region)
aws ec2 associate-address \
    --instance-id $(get-instance) \
    --allocation-id $allocation_id \
    --allow-reassociation