Node JS

• ref​here
  

1. First, create a new directory where all the files would live. In this directory create a package.json file that describes your app and its dependencies: file package.json as following

   {
     "name": "docker_web_app",
     "version": "1.0.0",
     "description": "Node.js on Docker",
     "author": "First Last <first.last@example.com>",
     "main": "server.js",
     "scripts": {
       "start": "node server.js"
     },
     "dependencies": {
       "express": "^4.16.1"
     }
   }
   

With your new package.json file, run npm install. If you are using npm version 5 or later, this will generate a package-lock.json file which will be copied to your Docker image.

2. Then, create a server.js file that defines a web app using the Express.js framework:

   'use strict';
   
   const express = require('express');
   
   // Constants
   const PORT = 8080;
   const HOST = '0.0.0.0';
   
   // App
   const app = express();
   app.get('/', (req, res) => {
     res.send('Hello World');
   });
   
   app.listen(PORT, HOST, () => {
     console.log(`Running on http://${HOST}:${PORT}`);
   });
   

3.create Dockerfile with following content

FROM node:16

# Create app directory
WORKDIR /usr/src/app

# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./

RUN npm install
# If you are building your code for production
# RUN npm ci --only=production

# Bundle app source
COPY . .

EXPOSE 8080
CMD [ "node", "server.js" ]

4. Create a .dockerignore file in the same directory as your Dockerfile with following content:

   node_modules
   npm-debug.log
   

This will prevent your local modules and debug logs from being copied onto your Docker image and possibly overwriting modules installed within your image.