traefik.yml

services:
  traefik:
    image: traefik:v2.3
    ports:
      # Listen on port 80, default for HTTP, necessary to redirect to HTTPS
      - 80:80
      # Listen on port 443, default for HTTPS
      - 443:443
    restart: always
    volumes:
      # Add Docker as a mounted valume, so that traefik can read the labels of other services
      - /var/run/docker.sock:/var/run/docker.sock:ro
      # Mount the volume to store the certificates
      - traefik-public-certificates:/certificates
    command:
      # Enable Docker in Traefik, so that it reads labels from Docker services
      - --providers.docker
      # Do not export all Docker services, only the ones explicitly exposed from labels
      - --providers.docker.exposedbydefault=false
      # Create an entrypoint "http" listening on port 80
      - --entrypoints.http.address=:80
      # Create an entrypoint "https" listening on port 443
      - --entrypoints.https.address=:443
      # Create the certificate resolver "le" for Let's Encrypt, uses the environment variable EMAIL
      - --certificatesresolvers.le.acme.email=${EMAIL?Variable not set}
      # Store the Let's Encrypt certificates in the mounted volume
      - --certificatesresolvers.le.acme.storage=/certificates/acme.json
      # Use the TLS Challenge for Let's Encrypt
      - --certificatesresolvers.le.acme.tlschallenge=true
      # Enable the access log, with HTTP requests
      - --accesslog
      # Enable the Traefik log, for configurations and errors
      - --log
      # Enable the Dashboard and API
      - --api
    labels:
      # Enable Traefik for this service, to make it available in the public network
      - traefik.enable=true
      # Use the traefik-public network (declared below)
      - traefik.docker.network=traefik-public
      # Use the custom label "traefik.constraint-label=traefik-public"
      # This public Traefik will only use services with this label
      # That way you can add other internal Traefik instances per stack if needed
      - traefik.constraint-label=traefik-public
      # admin-auth middleware with HTTP Basic auth
      # Using the environment variables USERNAME and HASHED_PASSWORD
      - traefik.http.middlewares.admin-auth.basicauth.users=${USERNAME?Variable not set}:${HASHED_PASSWORD?Variable not set}
      # https-redirect middleware to redirect HTTP to HTTPS
      # It can be re-used by other stacks in other Docker Compose files
      - traefik.http.middlewares.https-redirect.redirectscheme.scheme=https
      - traefik.http.middlewares.https-redirect.redirectscheme.permanent=true
      # traefik-http set up only to use the middleware to redirect to https
      # Uses the environment variable DOMAIN
      - traefik.http.routers.traefik-public-http.rule=Host(`${TRAEFIK_DOMAIN?Variable not set}`)
      - traefik.http.routers.traefik-public-http.entrypoints=http
      - traefik.http.routers.traefik-public-http.middlewares=https-redirect
      # traefik-https the actual router using HTTPS
      # Uses the environment variable DOMAIN
      - traefik.http.routers.traefik-public-https.rule=Host(`${TRAEFIK_DOMAIN?Variable not set}`)
      - traefik.http.routers.traefik-public-https.entrypoints=https
      - traefik.http.routers.traefik-public-https.tls=true
      # Use the special Traefik service api@internal with the web UI/Dashboard
      - traefik.http.routers.traefik-public-https.service=api@internal
      # Use the "le" (Let's Encrypt) resolver created below
      - traefik.http.routers.traefik-public-https.tls.certresolver=le
      # Enable HTTP Basic auth, using the middleware created above
      - traefik.http.routers.traefik-public-https.middlewares=admin-auth
      # Define the port inside of the Docker service to use
      - traefik.http.services.traefik-public.loadbalancer.server.port=8080

    networks:
      # Use the public network created to be shared between Traefik and
      # any other service that needs to be publicly available with HTTPS
      - traefik-public

volumes:
  # Create a volume to store the certificates, there is a constraint to make sure
  # Traefik is always deployed to the same Docker node with the same volume containing
  # the HTTPS certificates
  traefik-public-certificates:

networks:
  # User the previously created public network "traefik-public", shared with other
  # services that need to be publicly available via this Traefik
  traefik-public:
    external: true