Dynamic IP with Cloudflare

updateip.sh

# Add to `crontab -e`: 
# @hourly /home/pi/updateip.sh > /home/pi/.ip-log.txt
# @reboot sleep 30 && /home/pi/updateip.sh > /home/pi/.ip-log.txt


IP=`curl -s http://api.ipify.org/`
if [ -f $HOME/.ip.txt ]; then
  OLD_IP=`cat $HOME/.ip.txt`
else
  echo "No file, need IP"
  OLD_IP=""
fi

if [ "$IP" = "$OLD_IP" ]; then
  echo "IP Unchanged"
  exit 0
fi

echo "Updating ip to $IP"
RESPONSE=$(
  curl -X PUT "https://api.cloudflare.com/client/v4/zones/ZONEID/dns_records/DNSRECORDID" \
     -H "X-Auth-Email: AUTHEMAIL" \
     -H "X-Auth-Key: APIKEY" \
     -H "Content-Type: application/json" \
     --data '{"type":"A","name":"DNSNAME","content":"'"$IP"'","ttl":1,"proxied":false}'
)
if [ "$RESPONSE" != "${RESPONSE%success*}" ]; then
  echo "Updated succesfuly!"
  echo $IP > $HOME/.ip.txt
  exit
else
  echo 'Something went wrong'
  echo "Response: $RESPONSE"
  exit 1
fi