This is a Docker image to aid in the process of creating self-signed certificates SSL support in web servers.
Currently the only parameter it accepts is the domain.
Just run a container, mounting a directory in the output volume where the generated keys and certificates will be stored:
$ docker run -i -t --rm -v $PWD:/output zareone/signstar my.domain.com
After doing this, you should have the private keys and certificates for the domain and the "fake" Certificate Authority.