Just a dockerized node app using mongodb as another linked container
first build your container
docker build -t you/node-mongo-sample .then, download mongodb and use the name "mongo" in it to make things (even more) easier
docker run mongo --name mongocall this app's container linking the "mongo" container's ip to the name "mongo" on your app's network mapping
docker run -d -p 3000:<your_open_port> --name node-mongo-sample --link mongo:mongo you/node-mongo-sample