Grabs the hostname from the Name Meta-tag, if it has the zone in it, it is striped and added to route53. If it is on a VPC it CNAMES the private IP otherwise the public hostname.

route53-hostname-from-tag.sh

#!/bin/bash
  ZONE="my.route53-dnszone.com"
  test_local="$(curl --write-out %{http_code} --silent --output \
      /dev/null http://169.254.169.254/latest/meta-data/public-hostname)"
  if [ "200" = "$test_local" ]; then
    CNAME="$(curl -s http://169.254.169.254/latest/meta-data/public-hostname)"
  else
    CNAME="$(curl -s http://169.254.169.254/latest/meta-data/local-ipv4)"
  fi
  HOSTNAME="$(ec2-describe-tags \
    -O ${AWS_ACCESS_KEY_ID} \
    -W ${AWS_SECRET_ACCESS_KEY} \
    --filter "resource-type=instance" \
    --filter "resource-id=$(ec2-metadata -i | cut -d ' ' -f2)" \
    --filter "key=Name" | cut -f5)"
  cli53 rrcreate -r ${ZONE} ${HOSTNAME/.$ZONE/} CNAME ${CNAME}