Dockerfile

FROM node:alpine

# http://jdlm.info/articles/2016/03/06/lessons-building-node-app-docker.html

RUN useradd --user-group --create-home --shell /bin/false deploy
ENV HOME=/home/deploy
USER deploy

RUN npm install pm2 -g
RUN npm install yarn -g

VOLUME ["/home/deploy/app"]
WORKDIR /home/deploy/app

COPY package.json /tmp/package.json
RUN cd /tmp && yarn
RUN yarn cache clean
RUN mkdir -p /home/deploy/app && cp -a /tmp/node_modules/ /home/deploy/app
COPY . /home/deploy/app

RUN chown -R deploy:deploy $HOME/*

CMD ["node", "index.js"]