Redirect domains to specific URLs with Traefik v2

Rewritten on Jan 7, 2020.

This enables Traefik to redirect for example, foo.birkhoff.me to https://www.google.com. The TLS section is required for a full HTTPS setup.

The below is a dynamic configuration, refer to the Traefik docs for the info.

http:
  routers:
    redirections:
      service: dummyservice
      tls:
        certResolver: acme
      middlewares:
        - "foo-redirectregex"
        - "bar-redirectregex"
      rule: "Host(`foo.birkhoff.me`) || Host(`bar.birkhoff.me`)"

  middlewares:
    foo-redirectregex:
      redirectRegex:
        regex: "^https?://foo.birkhoff.me"
        replacement: "https://www.google.com"
        permanent: true
    bar-redirectregex:
      redirectRegex:
        regex: "^https?://bar.birkhoff.me"
        replacement: "https://www.twitter.com"
        permanent: true

  services:
    dummyservice:
      loadBalancer:
        servers:
          - url: "http://1.1.1.1:80"