AWS Command Tools

auto-associate-address.sh

#!/bin/sh

selfId=$(curl http://169.254.169.254/latest/meta-data/instance-id)

allocIds=$(aws ec2 describe-addresses | jq '[.Addresses[] | select(.AssociationId == null) | .AllocationId]')
allocLen=$(echo ${allocIds} | jq length)

if [ "${allocLen}" -eq 0 ]; then
  echo 'Allocation address not found' 1>&2
  exit 2
fi

allocId=$(echo ${allocIds} | jq -r .[1])

aws ec2 associate-address --instance-id ${selfId} --allocation-id ${allocId}