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I have hpa configured for one of my deployment in Kubernetes.
Is there any way to check if HPA scaling happened to the deployment and when it happened?
I don't have prometheus or any monitoring solutions deployed.
919
Default HPA relative metrics tolerance is 10% HPA waits for 3 minutes after the last scale-up events to allow metrics to stabilize. This can also be configured through — horizontal-pod-autoscaler-upscale-delay flag. HPA waits for 5 minutes from the last scale-down event to avoid autoscaler thrashing.
To test that the horizontal pod autoscaler is working properly, you need to load test this service and make sure that the replicas increase proportionately with traffic. To do this, you will run a BusyBox pod that makes an HTTP call to your service, sleeps for 0.01 seconds, and repeats.
If you created HPA you can check current status using command
$ kubectl get hpa
You can also use "watch" flag to refresh view each 30 seconds
$ kubectl get hpa -w
To check if HPA worked you have to describe it
$ kubectl describe hpa <yourHpaName>
Information will be in Events: section.
Also your deployment will contain some information about scaling
$ kubectl describe deploy <yourDeploymentName>
...
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 11m deployment-controller Scaled up replica set php-apache-b5f58cc5f to 1
Normal ScalingReplicaSet 9m45s deployment-controller Scaled up replica set php-apache-b5f58cc5f to 4
Normal ScalingReplicaSet 9m30s deployment-controller Scaled up replica set php-apache-b5f58cc5f to 8
Normal ScalingReplicaSet 9m15s deployment-controller Scaled up replica set php-apache-b5f58cc5f to 10
Another way is use events
$ kubectl get events | grep HorizontalPodAutoscaler
5m20s Normal SuccessfulRescale HorizontalPodAutoscaler New size: 4; reason: cpu resource utilization (percentage of request) above target
5m5s Normal SuccessfulRescale HorizontalPodAutoscaler New size: 8; reason: cpu resource utilization (percentage of request) above target
4m50s Normal SuccessfulRescale HorizontalPodAutoscaler New size: 10; reason:
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