Traefik: Dynamic routing by subdomain

Question

Problem,

I have multiple services that are deployed on Docker containers. Each set of our clients should be routed to a specific service. Example:

• Client1 -> service1
• Client2 -> service1
• client3 -> service2

This should done using subdomain: client1= client1.example.com client2 = client2.example.com

Question:

I would like this config to be dynamic meaning that Traefik needs to get these routing rules dynamically from another service:

• I can for example create a service that giving a hostname return the name of service that Traefik should route to.
• Or maybe when a client is added I can push this rule to Traefik.

Details:

This feature is useful when I create a saas application.

Thank you very much.

Answer 1

One easy way to achieve this is to use regex for the defined routers for each of the services and update the regex once you onboarded a new client

For instance, add this label to the service 1

 - traefik.http.routers.app-backend.rule=HostRegexp(`{subdomain:(clinet1)}.example.com`)

and when you add another client that should be served by service 1, just update the label to be

 - traefik.http.routers.app-backend.rule=HostRegexp(`{subdomain:(clinet1|clientX)}.example.com`)