Traefik in network_mode: host

docker-compose.yml

version: "3.7"

services:
  traefik:
    image: "traefik:v2.2"
    container_name: "traefik"
    command:
      - "--accesslog=true"
      - "--api.insecure=true"
      - "--entrypoints.web.address=:80"
      - "--providers.docker=true"
      - "--providers.file=true"
      - "--providers.file.filename=/etc/traefik/rules.yaml"
    ports:
      - "80:80"
      - "8080:8080"
    volumes:
      - "./rules.yaml:/etc/traefik/rules.yaml"
      - "/var/run/docker.sock:/var/run/docker.sock:ro"

  whoami:
    image: "containous/whoami"
    container_name: "simple-service"
    network_mode: host
    command:
      - "--port=32000"
    labels:
      - "traefik.enable=false"

rules.yaml

http:
  routers:
    whoami:
      rule: Host(`your.domain.com`)
      entrypoints:
        - web
      service: whoami
  services:
    whoami:
      loadBalancer:
        servers:
          # 172.17.0.1 is the `docker0` interface
          - url: 'http://172.17.0.1:32000'