The DevOps 2.3 Toolkit
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What now?

The good news is that ReplicaSets are relatively straightforward. They provide a guarantee that the specified number of replicas of a Pod will be running in the system as long as there are available resources. That's the primary and, arguably, the only purpose.

The bad news is that ReplicaSets are rarely used independently. You will almost never create a ReplicaSet directly just as you're not going to create Pods. Instead, we tend to create ReplicaSets through Deployments. In other words, we use ReplicaSets to create and control Pods, and Deployments to create ReplicaSets (and a few other things). We'll get to Deployment soon. For now, please delete your local Minikube cluster. The next chapter will start from scratch.

minikube delete  
If you'd like to know more about ReplicaSets, please explore ReplicaSet v1 apps ( https://v1-9.docs.kubernetes.io/docs/reference/generated/kubernetes-api/v1.9/#replicaset-v1-apps) API documentation.
Figure 4-4: The components explored so far