I'm learning traefik and I try to setup the dashboard without port 8080 open.

With the config below, I can access the dashboard.

docker-compose.yml

```
version: '3'

services:
  reverse-proxy:
    image: traefik:1.7.9-alpine
    restart: unless-stopped
    networks:
      - mynet
    ports:
      - "80:80"
      - "8080:8080"
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - /opt/traefik/traefik.toml:/traefik.toml
networks:
  mynet:
    external: true

```

traefik.toml

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

[api]

[docker]

```

As soon as I remove the port 8080 from docker-compose.yml I can't access it anymore.

What are the missing parts to have this very simple setup working?