🚀 Dockerfile Learning and Practice

Welcome to the Dockerfile Learning and Practice repository! Here, you'll find various Dockerfiles that will help you understand and practice containerization concepts. Whether you're a beginner or an experienced developer, this guide will assist you in mastering Docker commands and best practices. 🐳

📌 What You'll Learn

• How to structure a Dockerfile efficiently.
• Essential Docker commands and their purpose.
• Best practices for building lightweight and optimized containers.

🔧 Common Docker Commands

Below is a sample Dockerfile demonstrating key Docker instructions:

# 🏗️ Base Image
# Specifies the lightweight Node.js Alpine base image
FROM node:22-alpine

# 📂 Set Working Directory
WORKDIR /app

# 🔄 Update & Install Dependencies
RUN apt-get update && apt-get install -y curl

# 🌍 Set Environment Variables
ENV NODE_ENV=production

# 📥 Copy Files from Host to Container
COPY . /app

# 🚀 Default Command
CMD ["node", "app.js"]

# 🌐 Expose Container Port
EXPOSE 8080

📚 Explanation of Commands

• FROM node:22-alpine → Defines the base image for the container.
• WORKDIR /app → Sets the working directory for subsequent instructions.
• RUN apt-get update && apt-get install -y curl → Installs required dependencies.
• ENV NODE_ENV=production → Defines environment variables for runtime configurations.
• COPY . /app → Copies project files from the host to the container.
• CMD ["node", "app.js"] → Specifies the default command to run when the container starts.
• EXPOSE 8080 → Declares the port the container will listen on.

🚀 Getting Started with Docker

1️⃣ Build the Docker Image

docker build -t my-docker-app .

2️⃣ Run the Container

docker run -p 8080:8080 my-docker-app

3️⃣ Access the Application

Open your browser and go to:

http://localhost:8080

🛠️ Additional Resources

• Docker Official Documentation
• Best Practices for Writing Dockerfiles

Happy Coding! 🚀🐳