Docker Hello world : create image of NodeJS web server with Docker, on Linux Ubuntu

gistfile1.txt

Installation on Linux Ubuntu:

install docker with those commands:
- sudo apt-get update
- sudo apt-get upgrade
- sudo apt install docker.io
- systemctl start docker
- systemctl enable docker
- docker --version

install nodejs and npm with those commands
- sudo apt-get install nodejs -y
- sudo apt-get install npm -y
- npm -v
- nodejs -v

run app and go to localhost:8080
  -  node index.js
  -  go to localhost:8080
  -  if all good, the exit by shortcut CTRL+C

create docker image + check if created + run docker image
  -  sudo docker build -t image_name .
  -  sudo docker run -it -p 8080:8080 image_name
  -  go to localhost:8080
  -  to check the size of the container, then open new terminal and run this command: sudo docker container ls -s
  -  to remove docker image  by force, run this command: sudo docker image rm e20bb4abe4ee -f
  -  to delete all images by force, run this command: sudo docker rmi $(sudo docker images -aq) --force
  -  sudo docker images
  -  sudo docker image ls -a


index.js


const http = require("http");
const port = 8080;

const server = http.createServer(function (req, res) {
  res.write(
    `
 Hello Dockernized NodeJS People!
  `
  );
  res.end();
});

server.listen(port, function (error) {
  if (error) {
    console.log("Something went wrong", error);
  } else {
    console.log("Server is listening on port " + port);
  }
});


Dockerfile


FROM ubuntu:18.04
WORKDIR /app
COPY index.js /app

RUN apt-get update
RUN apt-get upgrade -y
RUN apt-get install nodejs -y
RUN apt-get install npm -y

COPY . /app
CMD node index.js