How to get traefik to redirect to specific non-docker port from inside docker

Question

First of all I\'m sorry if I\'m not using the right terms to ask this question, but I\'m not up to the terminology in place.

I have traefik running in a docker container

Answer 1

With the new Traefik (v.2) you need to use a combination of labels and an external file, you can find below my working example.

In your docker compose you need to add the comands to define the external file and enable the provider

  - "--providers.file=true"
  - "--providers.file.filename=/etc/traefik/rules.toml"

Into your file (rules.toml) the routing to foward to your external service (be aware of the syntax, use the char to define the host ( ` ) )

example :

Docker-compose:

  traefik:
    image: "traefik:v2.0.0"
    container_name: "traefik"
    restart: always
    command:
      - "--api.insecure=true"
      - "--providers.docker=true"
      - "--providers.docker.exposedbydefault=false"
      - "--entrypoints.web.address=:80"
      - "--entrypoints.websecure.address=:443"
      - "--certificatesresolvers.myhttpchallenge.acme.httpchallenge=true"
      - "--certificatesresolvers.myhttpchallenge.acme.httpchallenge.entrypoint=web"
      - "--certificatesresolvers.myhttpchallenge.acme.email=xx@xx.com"
      - "--providers.file=true"
      - "--providers.file.filename=/etc/traefik/rules.toml"
      - "--providers.docker=true"
      - "--providers.file.watch=true"
    ports:
      - "80:80"
      - "8080:8080"
      - "443:443"
    networks:
      - proxy
    environment:
      - CF_API_EMAIL="xx"
      - CF_API_KEY="xx"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock:ro"
      - "./traefik/rules.toml:/etc/traefik/rules.toml"

Rules.toml

  [http.routers]
   # Define a connection between requests and services
     [http.routers.nasweb]
        rule = "Host(`nas.xxxx.com`)"
        entrypoints = ["websecure"]
        service = "nas"
     [http.routers.nasweb.tls]
        certResolver = "myhttpchallenge"


 [http.services]
        # Define how to reach an existing service on our infrastructure
        [http.services.nas.loadBalancer]
           [[http.services.nas.loadBalancer.servers]]
             url = "http://192.168.0.165:80"