Tag Archives: StatefulSet

To Replicas Or Not To Replicas In Kubernetes Deployments And StatefulSets?

Knowing that HorizontalPodAutoscaler (HPA) manages auto-scaling of our applications, the question might arise regarding replicas. Should we define them in our Deployments and StatefulSets, or should we rely solely on HPA to manage them? Instead of answering that question directly, we'll explore different combinations and, based on results, define the strategy.

First, let's see how many Pods we have in our cluster right now.

You might not be able to use the same commands since they assume that go-demo-5 application is already running, that the cluster has HPA enabled, that you cloned the code, and a few other things. I presented the outputs so that you can follow the logic without running the same commands.

The output is as follows.

We can see that there are two replicas of the api Deployment, and three replicas of the db StatefulSets.
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