Kubernetes Rollouts

Key Features 🌟

Zero-Downtime Updates 🔄

Enables application updates without service interruption
Gradually replaces old pods with new ones
Maintains application availability during updates

Version Control 📝

Manages different versions of your application
Keeps track of deployment history
Enables easy rollback if issues occur

Traffic Management 🚦

Controls how traffic is shifted to new versions
Supports various deployment strategies:
- Rolling updates (default)
- Blue-green deployments
- Canary releases

Health Monitoring 🏥

Monitors new pods during deployment
Automatically stops rollout if issues detected
Ensures system stability

Resource Management ⚙️

Controls resource allocation during updates
Prevents system overload
Maintains performance standards

Sample Deployment Configuration 📄

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-deployment
  labels:
    app: myapp
    tier: frontend
spec:
  replicas: 5
  selector:
    matchLabels:
      app: alnafi-app
  template:
    metadata:
      labels:
        app: alnafi-app
    spec:
      containers:
      - name: nginx-container
        image: nginx

Essential Commands 💻

Deployment Management

# Apply deployment with recording
kubectl apply -f <file.yaml> --record

# Check pod status
kubectl get pod

# Check rollout status
kubectl rollout status deployment/<deployment-name>

# View rollout history
kubectl rollout history deployment/<deployment-name>

Update & Rollback

# Update container image
kubectl set image deployment myapp-deployment nginx-container=nginx:1.22-alpine

# Apply rolling update
kubectl apply -f rolling.yaml

# View specific revision history
kubectl rollout history deployment/<deployment-name> --revision=2

# Rollback to previous deployment
kubectl rollout undo deploy myapp-deployment

# View deployment history
kubectl rollout history deployment myapp-deployment

# Rollback to specific version
kubectl rollout undo deploy myapp-deployment --to-revision=3