GoDaddy DDNS Updater

As I’m running this site itself on my 4TB WDMyCloud home NAS, refer to my post WebHosting on WDMyCloud V4 Firmwares, I will need my DNS to be always pointing to it when my public IP changes.

Although my public IP seldom changes, I’ve been using a Python based script with its ‘pygodaddy’ module for a while to auto update my GoDaddy DDNS pointing to my WDMyCloud NAS. The script is supposed to update my current public IP by parsing GoDaddys DNS update form. But on few occasions when there’s the need to update, the script failed to work because obviously GoDaddy had changed something in their front-end. I’ve also used a similar PHP based script but that too failed to work. And worst still, for as long that I know of, GoDaddy hasn’t provide any means of updating the records other than manually from their site itself.

Like many others with paid GoDaddy domain account, I’ve been looking for permanent solution not until recently and long awaited for, GoDaddy has finally implemented some APIs for developments which now provides the ability to update the DNS records via a REST call. You can see more details at their developer’s site, https://developer.godaddy.com.

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With this API, I’ve written another simple shell script to perform the DDNS update which can be scheduled with a 5mins repeating Cron job. It should work on any Linux based systems. Why shell script? It’s simple, low-resource and does the update faster than any similar Python, PHP, Perl, Java JIT compiler I’ve tested on the NAS. On each run, the script will check for public IP changes against the local cache and GoDaddy records itself using cURL and only attempt to update if necessary. Even though GoDaddy did not specify the minimum update interval, updating too frequently could affect DNS propagation which could cause delay of the DNS being updated across the internet.

GoDaddy.sh
GoDaddy.sh

First you will need is of course your paid domain name, then a GoDaddy “ProductionAPI key/secret to use with this script. Go to this specific link, log in with your GoDaddy account then generate the API key/secret. Note that the very first time you do this, it will be created as “Test” environment (seen at the time of writing). Go back to the same page again or click on the “Keys” top menu then generate a new “ProductionAPI key/secret instead.

GoDaddy API
GoDaddy API

You can place this script anywhere on your server. I’ll explain more for users who’s not familiar with Linux.

Launch the editor i.e. nano /root/scripts/GoDaddy.sh; . Copy & paste the script source from the bottom of this post into the terminal, update the API key/secret , Domain and other desired options, then CTRL+X to save. Test the script if it’s working:

Once the script is in place, schedule a Cron job every 5mins, crontab -e; , examples below on a single line:

a. No logging (recommended):

b. With logging for debugging purposes (you will need to do your own log housekeeping, try logrorate?):

To update a subdomain (second-level domain i.e. subdomain.domain.com) instead of primary domain (top-level domain i.e. domain.com), set Type=A Type=CNAME (Updated: CNAME by default  can’t point to an IP) and Name=subdomain where subdomain is your subdomain.domain.com as seen in the GoDaddy DNS setup page.

I’ve also added optional advanced variables to include any custom scripts, programs or commands to execute when the IP update occurs or failed. This is so that you can place this script on top of your other applications i.e. those which requires public IP update cached in /tmp/current_ip or those which triggers upon IP changes. Read the script’s comments for more details. For instance, you can use Postfix‘s sendmail to trigger an email notification upon IP update or failures by setting the SuccessExec or FailedExec values. Those who’s using my WebHosting on WDMyCloud V4 Firmwares mods, you can configure its ESMTP to get similar results. For an example to get notified upon successful IP update, set the  SuccessExec value to:

This should be the permanent solution for now until GoDaddy decides to make other changes. Need a Windows based DDNS client updater? Not sure why would anyone leave their PC always awaked, unless it’s a Windows based NAS/server. Perhaps I can help to write a simple Windows executable. But you can always run Cygwin to deploy shell scripts also Ubuntu is already runnable in Windows 10 Insider Preview (at the time of writing). For now, only my NAS running 24/7 needs this. Any questions you can post it here, enjoy (-:

GoDaddy.sh

189 thoughts on “GoDaddy DDNS Updater”

  1. Avatar Justin says:

    Can this be setup to update multiple domains at the same time, or do I just need multiple scripts each one fore each domain?

  2. This looks great.

    Can you tell how can i use this script for ipv6 ?

  3. This has been running fine on my QNAP for months, but after a firmware update I am getting an error – as attached.
    Can you suggest what might be the issue ?
    Thanks

      1. But if you look at the attachment I did a cURL –version which showed:
        CURL 7.43.0 and LIBCURL 7.43.0
        So I am assuming they are installed.

        1. Seems to be CRLF issue. Try creating a new script file using nano or vi then copy and paste the script content again. Or convert the existing script using dos2unix.

        2. Repeating the “which” command from the script seems to get the right response – as attached – showing the directory as sbin/curl

  4. But the $PATH setting appears to omit this sbin/curl folder – could this be the issue even though the CURL seems to be being found?

    1. Your curl is in /sbin and /sbin is already in your path environment so everything is good except did you take a look at my previous reply minutes ago about CRLF?

      1. Thank you.
        I did create it originally with vi, but obviously got some extra line-ends in there somehow.
        Fixed immediately with dos2unix.

  5. Avatar Harry says:

    I get error: 401

    1. Avatar Harry says:

      Nevermind, I’ve made a mistake with my keys. Works!

      Thanks you! =)

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