Support multiple aliases at the same time?

[tecnativa]

Support multiple aliases at the same time?

[pedrobaeza]

Although it's an interesting feature, it's not implemented right now and you should put multiple points. Technically, I don't know right now which are the challenges to implement something like that. You can try to and contribute it in a pull request if you think it's feasible.

[Ocramius]

Yeah, was looking at the code, and it seems like proxy.py would need to be rewritten completely, since only one ip is resolved right now 🤔

docker-whitelist/proxy.py

Lines 14 to 21 in a4e0d28

	ip = target = os.environ["TARGET"]
	udp_answers = os.environ.get("UDP_ANSWERS", "1")
	# Resolve target if required
	if os.environ["PRE_RESOLVE"] == "1":
	resolver = Resolver()
	resolver.nameservers = os.environ["NAMESERVERS"].split()
	ip = random.choice([answer.address for answer in resolver.query(target)])

Also, it would only work if a Host header is parsed, so it's no longer just a transparent proxy.

[Ocramius]

Gonna close here: I cannot currently work on this myself, as it completely redesigns everything, but I hope this is still useful to others :)

Meanwhile, I found an approach that better fits my own use-case, by using Traefik as a load balancer pointing to an external network:

http:
  routers:
    foobar:
      entryPoints:
      - websecure
      middlewares:
      - strip
      service: myexthost
      rule: Host(`dev.mytraefikhost.de`) && Path(`/myexthost/www`)
      tls: {}

  myexthost:
    foobar:
      loadBalancer:
        servers:
        - url: https://www.myexthost.de
 
  middlewares:
    strip:
      stripPrefix:
        prefixes:
        - /myexthost/www

See https://community.traefik.io/t/reverse-proxy-to-external-host/3615/4

This requires putting traefik on a non-internal network, as well as a second internal network that does not have the www.myexthost.de as part of its internal DNS aliases.

That's obviously very much overkill for most folks, so this project is still very much valid in its own scope, just hoping this is useful to others.

[pedrobaeza]

Thanks for the insights. Indeed, it seems not easy to be performed.