Computer NetworKING & System Administrator

Docker Image Layers Breakdown: Layer 1: FROM node:24 dockerfile FROM node:16 What it provides: - Base operating system (usually Debian/Alpine Linux) - Node.js runtime environment - npm package manager - System libraries and dependencies --- Layer 2: RUN apt-get update dockerfile RUN apt-get update What it does: - Updates package repository indexes - Ensures latest package versions are available - Creates a new layer with updated package lists --- Layer 3: RUN npm install dockerfile RUN npm install ``` What it does: - Installs all dependencies from package.json - Downloads node_modules - Adds application dependencies to the image --- Layer 4: COPY . /app dockerfile COPY . /app ``` What it does: - Copies your application source code - Adds configuration files - Includes all your custom files into the image --- 🎯 Key Benefits of This Layering: Storage Efficiency: Container A (Node App)    Container B (Node App) ├── App Code              ├── Dif...