Dockerfile

# specify base image to start from

FROM node:9.4.0-alpine

# copy files

COPY app.js .

COPY package.json .

# execute commands

RUN npm install &&\

    apk update &&\

    apk upgrade

# exposes port 8080 with a specified protocol inside a Docker Container

EXPOSE  8080

# run app.js with executable "node"

CMD node app.js

# Build in the current dir with tag myimage version v1

# > docker build . -t myimage:v1

# > docker images

# Run the image as a container

# -d=detach, run in background

# -p=publish a container's port to the host

# > docker run -dp 8080:8080 myimage:v1

# Ping the application

# > curl localhost:8080