☁️ Free practice test question from: KCNA (KCNA)

ReplicaSet - This object ensures that a specified number of pod replicas are running at all times. If there are too many pods, it terminates the excess. If there are too few, it creates more. ReplicaSets use a selector to identify which pods they can acquire and maintain.

Deployments manage ReplicaSets, which in turn manage Pods. The ReplicaSet is the specific component responsible for maintaining the desired number of Pod replicas.

"Replica" refers to the identical copies of a Pod that are created. These replicas are exact duplicates of the same application container, configured identically and running the same code. When you deploy an application in Kubernetes, you typically want multiple instances (or replicas) of it running simultaneously for reliability and scalability.

"Set" indicates that this object maintains a collection or group of these replicas as a cohesive unit. The ReplicaSet is responsible for ensuring that this set maintains its desired state - specifically, that the correct number of Pod replicas exists at all times.