How to: Forward additional ports (nginx hosting example)
It's possible to forward additional ports depending on your needs. In this example, we'll use Mac OSX to host nginx:

```
host:10023 <-> 10023:container:10023 <-> 80:guest
```

On the host machine, run:

```bash
docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -e ADDITIONAL_PORTS='hostfwd=tcp::10023-:80,' \
    -p 10023:10023 \
    sickcodes/docker-osx:auto
```

In a Terminal session running the container, run:

```bash
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

brew install nginx
sudo sed -i -e 's/8080/80/' /usr/local/etc/nginx/nginx.confcd