Docker & Kubernetes: Production Deployment Guide

# Use specific versions, not latest
FROM node:20-alpine

WORKDIR /app

# Copy package files first for better caching
COPY package*.json ./
RUN npm ci --only=production

COPY . .

# Run as non-root user
USER node

EXPOSE 3000
CMD ["node", "server.js"]
version: '3.8'
services:
  app:
    build: .
    ports:
      - "3000:3000"
    environment:
      - NODE_ENV=development
    volumes:
      - .:/app
      - /app/node_modules
    depends_on:
      - db
      - redis

  db:
    image: postgres:15-alpine
    volumes:
      - postgres_data:/var/lib/postgresql/data
    environment:
      POSTGRES_PASSWORD: secret

  redis:
    image: redis:7-alpine

volumes:
  postgres_data:
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-app
        image: myregistry/my-app:v1.0.0
        ports:
        - containerPort: 3000
        resources:
          limits:
            memory: "512Mi"
            cpu: "500m"
          requests:
            memory: "256Mi"
            cpu: "200m"
        env:
        - name: NODE_ENV
          value: "production"
---
apiVersion: v1
kind: Service
metadata:
  name: my-app
spec:
  selector:
    app: my-app
  ports:
  - port: 80
    targetPort: 3000
  type: LoadBalancer