🐳 Simple Node.js App in Docker

This project demonstrates how to build and run a basic Node.js web app inside a Docker container using a custom Dockerfile.

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📁 Project Structure

├── index.js ├── package.json └── Dockerfile

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🚀 Features

• Runs a Node.js web server using Express
• Built on a lightweight node:alpine image
• Exposes HTTP service on port 3000 inside the container
• Includes Docker DNS alias support for multi-container networking

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🛠️ Prerequisites

• Docker installed
• Basic knowledge of Node.js and Docker

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🧪 How to Use

1️⃣ Clone the repo or place your files in a folder:

mkdir webapp && cd webapp

Add index.js, package.json, and Dockerfile here

2️⃣ Build the Docker Image

 docker build -t mynodeapp .

3️⃣ Create a Docker Network

docker network create my_custom_net

4️⃣ Run the Container with a DNS Alias

docker run -d \
  --network my_custom_net \
  --network-alias web \
  --name nodeapp \
  mynodeapp

5️⃣ Test the App from Another Container

docker run --rm --network my_custom_net alpine \
  sh -c "apk add --no-cache curl && curl web:3000"

6️⃣ Output:

You should see:

Hello from the custom app container!

🧼 Cleanup

To stop and remove everything:

docker rm -f nodeapp
docker network rm my_custom_net

📚 Learn More:

📝 Dockerfile Reference

🐳 Node.js Official Image

🚀 Express.js Framework

🧑‍💻 Author:

Built with ❤️ by dchak2023