When the redis connection parameters are not specified, the image
will try to spin up a redis container if it is able to communicate with
the host docker.
This is only possible if the following two options are specified in the
docker run command:
`-v /var/run/docker.sock:/run/docker.sock`
`-v $(which docker):/bin/docker`
This is primarily added to get the quick start guide to work without
much of a hassel.