Abdullah Şamil Güser

Scaling

Horizontal Pod Autoscaling

• Uses the K8s Metrics Server
• Pods must have requests and limits defined
• The HPA checks the Metrics Server every 30 seconds
• Scale according to the min and max number or replicas defined
• Cooldown / Delay
  • Prevent racing conditions
  • Once a change has been made, HPA waits
  • By default, the delay on scale up events is 3 minutes, and the delay on scale down events is 5 minutes

kubectl - HPA Cheat Sheet

# The imperative way
kubectl autoscale deployment [name] --cpu-percent=50 --min=3 --max=10

# The declarative way
kubectl apply -f [hap.yaml]

# Get the autoscaler status
kubectl get hpa [name]

# Delete the HPA
kubectl delete -f [hap.yaml]

# Delete the HPA
kubectl delete hpa [name]