apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.21
        ports:
        - containerPort: 80
        resources:
          limits:
            memory: "128Mi"
            cpu: "500m"

# Apply deployment
kubectl apply -f deployment.yaml

# Get deployments
kubectl get deployments

# Scale deployment
kubectl scale deployment nginx-deployment --replicas=5

# Update image
kubectl set image deployment/nginx-deployment nginx=nginx:1.22

# Rollback
kubectl rollout undo deployment/nginx-deployment

# Check rollout status
kubectl rollout status deployment/nginx-deployment