Docker Best Practices: Multi-stage Builds, Optimization, and Security
Introduction Building efficient and secure Docker images requires following best practices that reduce image size, improve build times, and minimize security vulnerabilities. This guide covers essential techniques for production-ready containers.
Multi-Stage Builds The Problem: Bloated Images Before (single-stage build):
FROM node:18 WORKDIR /app # Install dependencies COPY package*.json ./ RUN npm install # Includes devDependencies # Copy source COPY . . # Build RUN npm run build # Runtime includes build tools and dependencies CMD ["node", "dist/index.js"] Result: 1.2GB image with unnecessary build tools and dependencies.
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