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April 1, 2022 07:30 am GMT

How to use docker to run a node js application

In this blog, I'll show you how to build a node js application, generate an image for it, and run it using Docker.

Let's create our node js application.

mdkir nodejsappcd nodejsapp

Now lets initialize package.json file using the following command.

npm init

Once your package.json file is created lets now install express.

npm install express

Hence your package.json file looks like this.

{  "name": "nodejsapp",  "version": "1.0.0",  "description": "nodejsapp description",  "main": "index.js",  "scripts": {    "test": "echo \"Error: no test specified\" && exit 1",    "start": "node index.js"  },  "author": "",  "license": "ISC",  "dependencies": {    "express": "^4.17.3"  }}

Let's get started with index.js to build our website.

const express = require("express");const app = express();const port=3000;app.get("/", (req, res) => {res.sendFile(__dirname + "/index.html");})app.get("/page", (req, res) => {res.sendFile(__dirname + "/page.html");})app.listen(port, () => {  console.log(`running at port ${port}`);});

Let's make two files index.html and page.html

<!-- index.html --><!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <meta http-equiv="X-UA-Compatible" content="IE=edge">    <meta name="viewport" content="width=device-width, initial-scale=1.0">    <title>Node JS</title></head><body>    <h1>Node JS</h1>    <p> Hello from Home   </p>    <br />    <a href="/page">next page</a></body></html>

<!-- page.html  --><!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <meta http-equiv="X-UA-Compatible" content="IE=edge">    <meta name="viewport" content="width=device-width, initial-scale=1.0">    <title>Node JS Page</title></head><body>    <h1>Second Page</h1>    <p> Hello from page 2</p>    <br />    <a href="/">Home page</a></body></html>

In your root directory, create a Dockerfile and .dockerignore .

FROM node:14-alpineRUN mkdir -p /home/appCOPY ./* /home/app/EXPOSE 3000WORKDIR /home/appRUN npm installCMD ["npm", "start"]

node_modules/package-lock.json

To build the docker image run the following command

docker build -t nodeapp:latest .ordocker build -t <dockerhub_name>/<app_name>:<tag> .

To ensure that your Docker image has been built, open a terminal and type docker images.The output will be displayed as seen below.

REPOSITORY            TAG             IMAGE ID       CREATED             SIZEnodeapp               latest          e0a978b53566   8 seconds ago       123MB

Let us now run our docker image named nodeapp (in my case).

docker run -p 3001:3000 e0a978b53566

Because I have bound my application to port 3001, it runs on that port. You are free to modify it as you see fit.

docker run -p <PORT>:3000 <IMAGE ID>

As a result, you can see your application running http://localhost:3001/ .

I hope this blog is useful to you.

Original Link: https://dev.to/ndrohith09/how-to-use-docker-to-run-a-node-js-application-4ima

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