☁️ Free practice test question from: KCNA (KCNA)

The controller manager is a control plane component that runs controller processes. These controllers are responsible for noticing and responding to changes in the cluster. When a change is detected in the desired state of a resource (such as through a kubectl command or API call), the controller manager's controllers start reconciliation loops to bring the actual state in line with the desired state.

Each controller is essentially a control loop that:

1. Observes the current state of the cluster through the API server

2. Compares it to the desired state

3. Makes necessary changes to bring the actual state closer to the desired state