Can you write docker file to install nodejs application - explanation with the best practices.

In the era of cloud-native development, Docker has revolutionized how applications are built, shipped, and deployed. For Node.js developers, containerization offers a consistent environment across development, testing, and production, eliminating the infamous “it works on my machine” dilemma. However, crafting an efficient and secure Dockerfile for Node.js requires more than just basic syntax—it demands adherence to best practices that optimize performance, enhance security, and ensure maintainability.

This guide will walk you through creating a production-grade Dockerfile for Node.js applications, explaining every decision in detail. By the end, you’ll understand not just the “how” but the “why” behind each best practice, empowering you to build robust, scalable, and secure containers.

Table of Contents

1. What is a Dockerfile?
2. Why Docker for Node.js?
3. Step-by-Step Dockerfile Creation
   • Choosing the Base Image
   • Setting the Working Directory
   • Copying Package Files
   • Installing Dependencies
   • Copying Application Code
   • Exposing Ports
   • Defining the Runtime Command
4. Best Practices Deep Dive
   • Multi-Stage Builds
   • Non-Root User & Permissions
   • Environment Variables
   • Process Managers (PM2)
   • Healthchecks
   • Logging to Stdout/Stderr
   • Security Scans
   • Image Tagging
5. Complete Dockerfile Example

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