pycharm不能完成Docker的远程解释器设置

I'm new to Docker. I'm using Docker & docker-compose, going through a flask tutorial. The base docker image is python 2.7 slim. It's running on Linux. docker 1.11.2 The application is working fine. I want to get pycharm pro connecting to the remote interpreter, something I have never done before. I'm new to Docker. I'm using Docker & docker-co