Need help for a simple docker configuration

Traefik Traefik v2
1

Hi,
I am new to Traefik (and so I begin with v2) bur far from it to Docker.
I am moving all my servers to a new server and take advantage of the move to dockerize them all. Hence my need for Traefik.
But I cannot say I find the doc self explanatory. So, here I am asking for some help.

The context is simple: I would like two project management containers to run concurrently on the same machine (my Ubuntu desktop for now). I have specified hostnames for each (I obfuscate the domain name):

  • one is a Gitlab container, lab.lan.mydomain
  • the other one is documentation server (Sismics Docs): kdo.lan.mydomain

They both publish on the port 80, and I do not need to connect to the outer world, so no need to use https.
Each of them, opened separately, works perfectly.
But as they both publish on port 80, I need Traefik.
So here is what I have done (I use docker-compose and prefer NOT to use the Traefik TOML configuration file in order to keep it simple and in one place):

The Traefik docker-compose file:

version: "3"
services:
  tfk:
    image: "traefik:v2.0"
    container_name: "tfk"
    command:
      - "--api.insecure=true"
      - "--providers.docker=true"
      - "--providers.docker.exposedbydefault=false"
      - "--entrypoints.web.address=:80"
    ports:
      - "80:80"
      - "8080:8080"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock:ro"

I am able:

  • to connect to the Traefik dashboard. All good.

The Gitlab docker-compose file

version: "3"
services:
  lab:
    hostname: lab.lan.<mydomain>
    restart: unless-stopped
    environment:
      - POSTGRES_PASS=ouie
    volumes:
      - "/media/cool/gitlab/logs:/var/log/gitlab"
      - "/media/cool/gitlab/config:/etc/gitlab"
      - "/media/cool/gitlab/data:/var/opt/gitlab"
    image: "gitlab/gitlab-ce:latest"
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.lab.rule=Host(`lab.docker.lan.<mydomain>`)"
      - "traefik.http.services.lab.loadbalancer.server.port=80"
      - "traefik.http.routers.lab.entrypoints=web"

I see the server registered properly in the Traefik dashboard.

The Sismics Docs docker-compose file

version: "3"
services:
    doc:
    hostname: kdo.lan.<mydomain>
    restart: unless-stopped
    volumes:
      - "/media/photo/kuq-doc/docs/data:/data"
    image: "sismics/docs:latest"
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.doc.rule=Host(`kdo.docker.lan.<mydomain>`)"
      - "traefik.http.services.doc.loadbalancer.server.port=80"
      - "traefik.http.routers.doc.entrypoints=web"

I see the server registered properly in the Traefik dashboard.

But, when I try to connect to either of them using their hostname, I get a 404.
However, when I try to connect to their docker inner IP address (172...), I am able to connect to each of them, but of course that is not the point of using Traefik.

What am I doing wrong/forgetting.
Please help.
Best,
Stephen