Home Assistant Dynamic DNS & SSL

There are numerous reasons to get an SSL certificate for your Home Assistant environment, particularly if you plan on allowing any external access.

Dynamic DNS is also extremely useful for external access so you can have a consistent domain name to use to access your HA environment even when your local ISP changes your IP address.

Dynamic DNS

For most people, I would recommend using the existing Duck DNS Add-On found in Settings > Add-Ons. In my case, I already have a separate Dynamic DNS setup for my home network. Rather than getting a SSL certificate for that DDNS provider I instead used an existing domain I own like this:

1. Setup a CNAME record from newsubdomain.mywebsite.com to mysubdomain.ddnsprovider.com

SSL - Lets Encrypt

Add the Lets Encrypt Add-on found in Settings > Add-Ons.

Fill out the Configuration information using the DNS challenge. You can use the http challenge if you expose your install's port to the web, but I didn't want to do that yet so DNS was a better option. You will need to read the add-ons documentation in details to get your configuration correct. Depending on your DNS provider you need to enter different settings, and I found the Documentation to be incorrect in places.

The short version is:

• Fill out your domain and email address
  • In my case, the domain would be: newsubdomain.mywebsite.com
• Find your DNS provider in the Example Configurations section of the Add-on Docs.
  • Do not use the "DNS providers" section downdown for this, some of the settings are incorrect/missing.
• Copy the settings under the "dns" section and paste those into your HA add-on configuration page. Example:

  • 

• Search for how to get any required credentials for your specific DNS provider. Fill in those fields.
• Save the Configuration page.
• Go to the Info page of the Add-on. and click Start.
  • The Add-on will begin trying to get your SSL certificate. Switch to the Log tab to to see if it was successful or if there were any errors. It may take several minutes, there's a refresh button at the bottom to reload get any new logs.