What Is Kubernetes?

Kubernetes (K8s) orchestrates containerized applications at scale. Handles deployment, scaling, and management automatically.

Core Concepts

Pod       = Smallest unit, one or more containers
Deployment = Manages multiple identical Pods
Service    = Exposes Pods to network
Ingress    = Routes external traffic

Deployment YAML

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: app
        image: my-app:v1
        ports:
        - containerPort: 3000

kubectl Commands

kubectl apply -f deployment.yaml   # Apply configuration
kubectl get pods                   # List pods
kubectl logs pod-name              # View logs
kubectl delete -f deployment.yaml  # Delete resources

Conclusion

Kubernetes has a learning curve but provides powerful orchestration. Start with minikube for local development.