Docker Environment Variables Explained (3 Ways) | ENV, -e & .env Files | Real Demo | Hindi

Описание: In this chapter 5.3, we take a deep dive into Docker Environment Variables and learn
ALL THREE professional ways to manage configuration in Docker applications.

We start by cleaning up unused Docker containers and images, and then move step-by-step
from basic ENV usage to real-world, production-ready approaches.

🔥 What You’ll Learn in This Video:
• How to define multiple ENV variables in a Dockerfile
• How to access ENV variables inside a Node.js application
• How to override ENV values at runtime using docker run -e
• Why image re-tagging matters and how it helps reuse images
• How to use .env files for clean and scalable configuration
• How to separate DEV and PROD environments
• Why .env files should NEVER be inside Docker images
• How .dockerignore improves security and best practices

🧪 Hands-on Demo Includes:
• Dockerfile ENV example
• Node.js app using process.env
• Runtime override using -e flags
• Using --env-file with .env.dev and .env.prod
• Understanding ENV priority rules in Docker

💡 By the end of this video, you’ll clearly understand:
ENV vs -e vs .env files — and WHEN to use WHAT in real projects.

This lesson is part of my Docker & Kubernetes Full Course designed for:
✔ Beginners
✔ Developers
✔ DevOps & Cloud aspirants
✔ Working professionals

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