Which statement about the Controller-Manager is NOT accurate?

Which statement about the Controller-Manager is NOT accurate?

• A. It is a control loop that monitors the state of your cluster and makes or requests changes
• B. It runs the Kubernetes API server
• C. It ensures the cluster moves toward the desired state
• D. It manages multiple controllers to reach the desired state

Answer: (B)

The Controller Manager runs a set of controllers that continually reconcile the actual state of the cluster with the desired state declared in resources. It watches the API server, evaluates what needs to change, and drives actions to bring the cluster toward the declared configuration. It manages multiple controllers—each responsible for a specific aspect like deployments, nodes, or replicas—so the whole system steadily moves toward the desired state. The statement that it runs the Kubernetes API server isn’t accurate because the API server (kube-apiserver) is a separate service that exposes the Kubernetes API. The controller manager interacts with the API server, but does not host it.

The Controller Manager runs a set of controllers that continually reconcile the actual state of the cluster with the desired state declared in resources. It watches the API server, evaluates what needs to change, and drives actions to bring the cluster toward the declared configuration. It manages multiple controllers—each responsible for a specific aspect like deployments, nodes, or replicas—so the whole system steadily moves toward the desired state.

The statement that it runs the Kubernetes API server isn’t accurate because the API server (kube-apiserver) is a separate service that exposes the Kubernetes API. The controller manager interacts with the API server, but does not host it.