Docker Assignment Node app

dockerfile

FROM node:6-alpine
# - this app listens on port 3000, but the container should launch on port 80
  #  so it will respond to http://localhost:80 on your computer
EXPOSE 3000

# - then it should use alpine package manager to install tini: 'apk add --update tini'
# - then it should create directory /usr/src/app for app files with 'mkdir -p /usr/src/app'

RUN apk add --update tini \
    && mkdir -p /usr/src/app

WORKDIR  /usr/src/app

# - Node uses a "package manager", so it needs to copy in package.json file
COPY package.json package.json

# - then it needs to run 'npm install' to install dependencies from that file
# - to keep it clean and small, run 'npm cache clean' after above
RUN npm install \
&& npm cache clean

# - then it needs to copy in all files from current directory

COPY . .

# - then it needs to start container with command 'tini -- node ./bin/www'
CMD ["tini", "--", "node", "./bin/www" ]
# - in the end you should be using FROM, RUN, WORKDIR, COPY, EXPOSE, and CMD commands