Note_Tech

All technological notes.

---

Project maintained by simonangel-fong Hosted on GitHub Pages — Theme by mattgraham

Docker Project: Node JS Web App

Back

---

Goal

• Create Node JS web app
• Create a Dockerfile
• Build image from Dockerfile
• Run image as container
• Connect to web app from a browser

---

Node JS App

• index.js

const express = require("express");

const app = express();

app.get("/", (req, res) => {
  res.send("<h1>Hi there!</h1>");
});

app.listen(8080, () => {
  console.log("Listening on port 8080");
});

• package.json

{
  "dependencies": {
    "express": "*"
  },
  "scripts": {
    "start": "node index.js"
  }
}

---

Dockerfile

# base image
FROM node:alpine

# install dependencies
# create a work dir for files
WORKDIR /usr/app

# copy package.json only to cach and install npm
COPY ./package.json ./
RUN npm install

# copy all files in the current dir to pwd of container
COPY ./ ./

# startup command
CMD ["npm", "start"]

---

Build and Run

docker build -t simonangelfong/simplenodejs .

# port forwarding / port mapping
docker run -p 8080:8080 simonangelfong/simplenodejs

---

TOP