Kubernetes/Workloads/Scaling and autoscaling (HPA)

CommandUpdated 3 weeks ago

Scaling and autoscaling (HPA)

Scale a Deployment by hand, or let the HorizontalPodAutoscaler follow CPU or memory. Needs metrics-server and CPU requests on the pods.

#kubernetes #scaling #hpa

Commands

Manual and automatic scaling

SHELL

1kubectl scale deploy/web --replicas=5 -n demo

2kubectl autoscale deploy/web --cpu-percent=70 --min=2 --max=10 -n demo

3kubectl get hpa -n demo -w

4kubectl top pods -n demo

Declarative HPA

hpa.yaml

YAML

1apiVersion: autoscaling/v2

2kind: HorizontalPodAutoscaler

3metadata:

4 name: web

5spec:

6 scaleTargetRef:

7 apiVersion: apps/v1

8 kind: Deployment

9 name: web

10 minReplicas: 2

11 maxReplicas: 10

12 metrics:

13 - type: Resource

14 resource:

15 name: cpu

16 target: { type: Utilization, averageUtilization: 70 }

HPA shows <unknown> targets until metrics-server is running and the pods declare resources.requests.cpu. Remove spec.replicas from the Deployment when an HPA manages it, or every apply resets the count.

Kubernetes/Workloads/Scaling and autoscaling (HPA)

CommandUpdated 3 weeks ago

Scaling and autoscaling (HPA)

Scale a Deployment by hand, or let the HorizontalPodAutoscaler follow CPU or memory. Needs metrics-server and CPU requests on the pods.

#kubernetes #scaling #hpa

Commands

Manual and automatic scaling

SHELL

1kubectl scale deploy/web --replicas=5 -n demo

2kubectl autoscale deploy/web --cpu-percent=70 --min=2 --max=10 -n demo

3kubectl get hpa -n demo -w

4kubectl top pods -n demo

Declarative HPA

hpa.yaml

YAML

1apiVersion: autoscaling/v2

2kind: HorizontalPodAutoscaler

3metadata:

4 name: web

5spec:

6 scaleTargetRef:

7 apiVersion: apps/v1

8 kind: Deployment

9 name: web

10 minReplicas: 2

11 maxReplicas: 10

12 metrics:

13 - type: Resource

14 resource:

15 name: cpu

16 target: { type: Utilization, averageUtilization: 70 }