Multi http sub-domains with Traefik

docker-compose.web1.yml

version: '3'
services:
  web1:
    image: emilevauge/whoami
    container_name: web1
    labels:
      - "traefik.enable=true"
      - "traefik.backend=whoami1"
      - "traefik.frontend.rule=Host:web1.example.com"
      - "traefik.port=80"
    restart: always
    networks:
      - traefik

networks:
  traefik:
    external:
      name: traefik

docker-compose.web2.yml

version: '3'
services:
  web2:
    image: emilevauge/whoami
    container_name: web2
    labels:
      - "traefik.enable=true"
      - "traefik.backend=whoami2"
      - "traefik.frontend.rule=Host:web2.example.com"
      - "traefik.port=80"
    restart: always
    networks:
      - traefik

networks:
  traefik:
    external:
      name: traefik

docker-compose.yml

version: '3'
services:
  traefik:
    image: traefik:alpine
    command: --web --docker --logLevel=DEBUG
    container_name: traefik
    ports:
      - "80:80"
      - "8080:8080"
    restart: always
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
      - "./traefik.toml:/etc/traefik/traefik.toml"
    networks:
      - traefik

networks:
  traefik:
    external:
      name: traefik

Traefik.md

$ tree
.
├── docker-compose.web1.yml
├── docker-compose.web2.yml
├── docker-compose.yml
└── traefik.toml

traefik.toml

defaultEntryPoints = ["http"]

[entryPoints]
  [entryPoints.http]
  address = ":80"

[docker]
endpoint = "unix:///var/run/docker.sock"
domain = "example.com"
exposedbydefault = false