The most common and recommended way to run code on Kubernetes is with a deployment, which is managed by a deployment controller. We will explore deployments in the next and further chapters, both specifying them directly and creating them implicitly with commands such as kubectl run.
A Pod by itself is interesting, but limited, specifically because it is intended to be ephemeral. If a Node were to die (or get powered down), all the Pods on that Node would stop running. ReplicaSets provide self-healing capabilities. The work within the cluster to recognize when a Pod is no longer available and will attempt to schedule another Pod, typically to bring a service back online, or otherwise continue doing work.
