Kubernetes HorizontalPodAutoscaler maxReplicas

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I have doubts about the use of HorizontalPodAutoscaler (HPA) in Kubernetes, what are the best practices of using HPA, especially in the implementation of MaxReplicate, as an example, If I have a cluster with 3 workers nodes running a single app, and setting up the HPA to scale up to 20 pods, but it is a good practice scale pods 3x more than the available nodes? Or scale the pods up to the same quantity of available worker nodes in the cluster as a better approach?

Thank you in advantage

kubernetes
1 Answers

first of all you need to test your application and decide a reasonable resources per pod "request and limits"

After setting the limit per pod then you know how many pods your cluster can maintain. for example if you have total/free 10 cpu and 10 Gi memory over the cluster and you set limit per pod to have 1 cpu and 1 Gi memo then you can run up to 10 pods.

then it's time to run your load test and fire the expected traffic at its max with the lowest number of pods you're planning to run that fit the normal/daily traffic .. gradually startup new pod and check if you can handle the high traffic or you need to add more pods still .. repeat this till you reach a appropriate number of pods. then you got the maximum number of pods that you can configure in your HPA.

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