Simple example of Dockerfile for nodejs application

app.js

var http = require('http');

// handle all request with a 200 ok
var server = http.createServer(function (request, response) {
  response.writeHead(200, {"Content-Type": "text/plain"});
  text = "Running Node.js:" + process.versions.node
  response.end(text);
});

// search for an injected port or use a default one
var port = process.env.PORT;

// go!
server.listen(port);

// logs con terminal that server is ready
console.log("Server running at http://0.0.0.0:" + port + "/");

Dockerfile

FROM ubuntu:14.04
MAINTAINER Giovanni Toraldo

ENV DEBIAN_FRONTEND noninteractive

RUN sed -i s/archive/it.archive/g /etc/apt/sources.list
RUN apt-get update

RUN apt-get install -y software-properties-common
RUN apt-add-repository ppa:chris-lea/node.js
RUN apt-get update
RUN apt-get install -y nodejs

RUN apt-get clean
RUN rm -rf /var/lib/apt/lists/*

RUN mkdir /var/www

ADD app.js /var/www/app.js

ENV PORT 8080
EXPOSE 8080

VOLUME ["/var/www/data"]

CMD ["/usr/bin/node", "/var/www/app.js"]