Build Dockerfile
$ docker build -t express-in-docker .
Run container
$ docker run -t -p 3000:3000 express-in-docker node index.js
Test app
$ open http://localhost:3000
$ docker build -t express-in-docker .
$ docker run -t -p 3000:3000 express-in-docker node index.js
$ open http://localhost:3000