📈 Horizontal Pod Autoscaler (HPA)

The Horizontal Pod Autoscaler automatically scales the number of pods in a deployment based on observed CPU utilization (or other select metrics).

⚙️ Basic Commands

🚀 Create an HPA

Create an HPA for a deployment, scaling based on CPU usage:

kubectl -n <namespace> autoscale deployment <deployment-name> --cpu-percent=20 --min=4 --max=10

📊 View Existing HPAs

List all HPAs in a specific namespace:

kubectl get hpa -n <namespace>

❌ Delete an HPA

Remove a Horizontal Pod Autoscaler:

kubectl delete hpa -n <namespace> <hpa-name>

🛠️ Edit an HPA

Manually edit an existing HPA configuration:

kubectl edit hpa -n <namespace> <hpa-name>

🧾 Example HPA Manifest

You can define an HPA using a YAML file for more control:

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: hpa-test
  namespace: dev
spec:
  minReplicas: 1
  maxReplicas: 10
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 50

ℹ️ Note: The above manifest uses API version autoscaling/v2 for enhanced metric support.

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