Complete Guide to Docker and Kubernetes for Developers

Introduction to Containerization

Docker has become the standard for containerizing applications, while Kubernetes orchestrates these containers at scale. This guide covers both technologies comprehensively.

Docker Basics

# Dockerfile
FROM node:20-alpine
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
COPY . .
EXPOSE 3000
CMD ["node", "server.js"]

Kubernetes Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: web-app
  template:
    metadata:
      labels:
        app: web-app
    spec:
      containers:
      - name: web-app
        image: myapp:latest
        ports:
        - containerPort: 3000

Conclusion

Mastering Docker and Kubernetes is essential for modern software development and deployment workflows.