Setting up a custom domain with an Azure Function app

Question

I have an Azure Function app running on dynamic pricing and am trying to set up a custom domain.

I have added and verified the domain and setup the CNAME record accordingly. The custom domain shows up correctly as the "URL" when I view the App Service settings in the Azure portal. If I try to use this domain, however (to access an HTTP trigger function), I am returned with "Error 404 - Web app not found."

When I look at the Function URL in the portal, it still shows the x.azurewebsites.net domain, not the custom domain I have added. Is there anything additional I need to do to get Functions working with a custom domain?

Answer 1

Copying from my answer on MSDN forum:

Indeed, custom domains are not yet supported for Dynamic Function plans. This support will come a bit later (no clear ETA to share at this point).

Answer 2

Thanks to @David Ebbo I figured out how to do this for a Function App running in a consumption plan (e.g. Y1). Here is the MSFT docs article:

https://docs.microsoft.com/en-us/azure/app-service/scripts/cli-configure-custom-domain

It seems that it cannot currently be done via the Azure Portal GUI and instead you must use Azure CLI to run the commands. It's easy to do directly from that article page using the "Try It" link to the embedded azCLI.