This is an Example on How to Use Docker for Beginners

Download and Install Docker

• Download Docker - arm64
• Download Docker - amd64
• Follow the instructions to install Docker Desktop App if you need help

Join the Discord - Fnbubbles420 Org Community

1. Create the Project Files

• a. Create a Folder for Your Project: Open your terminal or command prompt and create a directory:

  mkdir docker-simple-app
  cd docker-simple-app
  

b. Create app.js: Inside the docker-simple-app folder, create the app.js file. This will be your Node.js web server.

app.js content:

// app.js
const express = require('express');
const app = express();
const port = 9090;

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

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

c. Create package.json: Inside the same folder, create a package.json file. This will describe your app and its dependencies.

package.json content:

{
  "name": "docker-simple-app",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "docker-simple-app",
      "version": "1.0.0"
    }
  },
  "description": "## Download and install `Docker` - **[Download Docker- arm64](https://desktop.docker.com/win/main/arm64/Docker%20Desktop%20Installer.exe?utm_source=docker&utm_medium=webreferral&utm_campaign=dd-smartbutton&utm_location=module)** - **[Download_Docker- amd64](https://desktop.docker.com/win/main/amd64/Docker%20Desktop%20Installer.exe?utm_source=docker&utm_medium=webreferral&utm_campaign=dd-smartbutton&utm_location=module)** - **Follow the Instruction to install `Docker Desktop App` if you need help** ### Join the Discord - [Fnbubbles420 Org Community](https://www.discord.fnbubbles420.org/invite)",
  "main": "app.js",
  "scripts": {
    "start": "node app.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "bubblesthedev",
  "license": "ISC",
  "dependencies": {
    "express": "^4.21.1"
  }
}

2. Create the Dockerfile

Inside the docker-simple-app folder, create a file named `Dockerfile``. This file tells Docker how to build the image.

Dockerfile content:

# Use the official Node.js LTS image based on Alpine
FROM node:lts-alpine

# Set environment variables for production
ENV NODE_ENV=production

# Update apk and explicitly install OpenSSL and other necessary dependencies
RUN apk update && apk add --no-cache openssl bash

# Set working directory inside the container
WORKDIR /app

# Copy package.json and package-lock.json first to leverage Docker cache
COPY package.json package-lock.json ./

# Install dependencies securely
RUN npm ci --only=production

# Copy the rest of the application files
COPY . .

# Expose the app port
EXPOSE 9090

# Command to start the app
CMD ["npm", "start"]

3. Build the Docker Image

After creating your project files, open your terminal or command prompt in the docker-simple-app folder and run the following command to build the Docker image:

docker build -t simple-node-app .

• -t simple-node-app: This tags the image with the name simple-node-app.
• .: This tells Docker to use the Dockerfile in the current directory.

4. Run the Docker Container

Once the image is built, you can run the container using:

docker run -p 9090:9090 simple-node-app

• -p 9090:9090: This maps port 9090 on your local machine to port 9090 in the Docker container.

5. Access the Application

Open your browser and go to:

http://localhost:9090

• You should see the message:

Hello, World! from bubblesthedev

6. Stop the Container

To stop the running container, press CTRL + C in the terminal where the container is running.

List of Running Docker Containers

docker ps -a

Stop a Specific Container

docker stop <container_id_or_name>

• Then run this command again to check:

docker ps -a

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