Dockerize the NodeJs (local)

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In this post, let's explore how to dockerize a Node.js application on a local machine.

Contents

1. Install Docker
2. Start NodeJs App
3. Dockerize the NodeJs app?
4. Start the service
5. Check the status of the image

Install docker:

• You can go ahead and download and install the appropriate Docker package on your local system.
• For Windows, we can install the docker desktop.
• To make sure the installation is done, run this command, it’ll return the installed docker version.
• Open the docker desktop, and initiate the docker.

Initiate Simple NodeJs App

• Initiate the package.json
• Install the express
• Create a simple app

const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => {
  res.send('Hello World!')
})

app.listen(port, () => {
  console.log(`Example app listening on port ${port}`)
})        

Dockerize the NodeJs app?

• Create the docker file - Dockerfile

FROM node:19-alpine

COPY package.json   /app/
COPY app.js /app/
 
WORKDIR /app

RUN npm install

CMD ["node","app.js"]

        

• From: - Create a container from this base image. For example, if this is a Java application, it should start with Tomcat
• COPY - copy the required files to start the application.
• WORKDIR - app working directory to run the commands
• RUN - to run the commands inside the container
• CMD - commands to execute to start the app.

Build Image

• Build the docker image
• Run this docker command in the app path

docker build -t docker-app.        

• Build - build the docker image
• -t - with image name
• docker-app - image name
• . path of the docker file
• After this command, check the docker images

Run the Image

• Run the docker images using the following command

docker run -d -p 3000:9000 docker-app:latest        

• docker run - to run the image
• -d - to run the container in background mode
• -p - to open a port connection between the app host and the container.?
• <Host port> :< App port in the Container>
• Image name with tag
• To check the docker image status

docker ps        

Output

To delete the container,

• Stop the container by using the Container ID

docker stop <Container ID>
docker rm <Container ID>        

Thanks