No IP using Amazon Route53

noip

#!/bin/bash

# Requires cli53 to be installed
# https://github.com/barnybug/cli53

DNS_NAME="home";
DNS_ZONE="example.com";

export AWS_ACCESS_KEY_ID=
export AWS_SECRET_ACCESS_KEY=

NS=$(dig +short NS $DNS_ZONE | head -1)
DNS=$(dig @$NS +short ${DNS_NAME}.${DNS_ZONE});
IP=$(dig +short @resolver1.opendns.com myip.opendns.com);

if [ "$IP" != "$DNS" ]; then
    echo "Update required: Our IP is $IP but our DNS record points to $DNS";
    cli53 rrcreate $DNS_ZONE $DNS_NAME A $IP --ttl 60 --replace
else
    echo "No update required";
    exit 0;
fi