Which statement best describes the relationship between Deployments and ReplicaSets in Kubernetes?

Which statement best describes the relationship between Deployments and ReplicaSets in Kubernetes?

• A. ReplicaSets are created and managed by Deployments to ensure the desired number of pod replicas
• B. Deployments create ReplicaSets automatically but do not relate to ReplicaSets after creation
• C. ReplicaSets exist independently of Deployments
• D. Deployments manage ReplicaSets to ensure the desired number of pod replicas

Answer: (D)

Deployments set what you want to run and how it should be updated, and they coordinate the underlying ReplicaSets to make that happen. When you apply a Deployment, Kubernetes creates a ReplicaSet that runs the specified number of pods with the given template. If you change the Deployment (different pod template or replica count), it creates a new ReplicaSet with the new template and adjusts scaling across the old and new sets to roll out the update. The Deployment continuously manages these ReplicaSets to ensure the actual number of running pods matches the desired count, handling updates and rollbacks as needed. In short, Deployments manage ReplicaSets to ensure the desired number of pod replicas are running.

Deployments set what you want to run and how it should be updated, and they coordinate the underlying ReplicaSets to make that happen. When you apply a Deployment, Kubernetes creates a ReplicaSet that runs the specified number of pods with the given template. If you change the Deployment (different pod template or replica count), it creates a new ReplicaSet with the new template and adjusts scaling across the old and new sets to roll out the update. The Deployment continuously manages these ReplicaSets to ensure the actual number of running pods matches the desired count, handling updates and rollbacks as needed. In short, Deployments manage ReplicaSets to ensure the desired number of pod replicas are running.