feat(k8s): add a horizontal pod autoscaler #768
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this scales up when the average CPU utilization is at 95% of the requested CPU. We should remove the replicas key from the deployment, otherwise any time we deploy it will overwrite the HPA (source: https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/#migrating-deployments-and-statefulsets-to-horizontal-autoscaling) Behaviour: - every 15 seconds - The HPA controller checks the value of the metric used every 15 seconds per pod. - every 3 minutes - The HPA scales up pods if the metric threshold has been continually exceeded for 3 mins. - every 5 minutes - The HPA scales down pods if the metric threshold has not been exceeded for 5 mins. Further info: - https://user-guide.cloud-platform.service.justice.gov.uk/documentation/concepts/deploying.html#horizontal-pod-autoscaling-hpa - https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale
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This adds a horizontal pod autoscaler that scales up when the average CPU utilization is at 95% of the requested CPU.
I've deployed to dev, and it seems to work, but the limitranges might need tweaking. Currently the pods are exceeding the requested CPU even with 5 of them, but I'm not sure why.
View the status using
kubectl describe hpa -n data-platform-find-moj-data-dev find-moj-dataWe should remove the replicas key from the deployment, otherwise any time we deploy it will overwrite the HPA (source:
https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/#migrating-deployments-and-statefulsets-to-horizontal-autoscaling)
Behaviour:
Further info: