- Build the image from the Dockerfile above:

```
docker build --rm -t cberg-test .
```

- Run a container, sharing the host dir `/root/foo`:

```
docker run --rm -v /root/foo:/foo cberg-test
```

- In another shell, write something to the socket (which was created in `/root/foo` by the container):

```
echo 'hello docker' | socat - UNIX-CONNECT:/root/foo/bar.sock
```

- See the output of the container in the first shell:

```
hello docker
```