Example dockerfile

Dockerfile

# Use an official, pre-rolled node image
# https://hub.docker.com/_/node/
FROM node:7.8.0

# Some variales which we can set when building the image...
ARG SRCDIR=src

RUN mkdir -p /opt/app
WORKDIR /opt/app

# configure your app to bind to 8080 - don't worry,
# this is internal to the container - the actual port on the server
# hosting the app can be mapped however you want.
EXPOSE 8080
CMD ["npm" "start"]

# copies all files from 'src' dir into '/opt/app' - Do *NOT* append a star
COPY $SRCDIR/ /opt/app