'Running two Azure Web Apps on different subdomains of the same domain

I have a multi-tenant web app where each tenant has their own subdomain -- tenant.thing.co.uk.

Can I set up two Azure Web Apps on different subdomains and move the tenant to a sub-sub domain like this:

  • tenant.app1.thing.co.uk and
  • tenant.app2.thing.co.uk?

In the Azure Web App under Custom domains I can enter *.app1.thing.co.uk and add TXT and CNAME records to my DNS to get the validation to pass: there is one TXT record and two CNAME records: | Name | Data | | -----| -------------- | | app1 | thing-app.azurewebites.net | | app2 | thing-app2.azurewebsites.net |

But it doesn't work! (Firefox says: Server not found.)

However, if I add one CNAME for *.thing.co.uk and add *.app1.thing.co.uk to one Azure Web App (and delete the other Azure Web App) then the website appears and the tenant subdomains work.

So: what's going wrong with two apps?

azure-webapps


Solution 1:[1]

Add an A Record for each subdomain pointing to the IP address of each App Service.

Solution 2:[2]

The answer appears to be:

In DNS:

  • add a TXT record with name asuid.subdomain for each subdomain, and
  • add a CNAME record with name *.subdomain and value the azure web app domain name.

In Custom domains for the Azure web app:

  • add a custom domain *.subdomain.domain.tld, and
  • add a custom domain subdomain.domain.tld.

So the fix for me was to add two -- not one -- custom domains in the Azure website.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Matt Small
Solution 2 Richard Barraclough

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