☁️ Free practice test question from: KCNA (KCNA)

In Kubernetes architecture, a Deployment is a higher-level resource that manages ReplicaSets, which in turn manage Pods. The Deployment's primary purpose during rolling updates is to maintain a declarative record of how your application should be deployed.

The declarative record in Kubernetes is primarily expressed through YAML files (though JSON is also supported). This YAML declaration is at the heart of how Kubernetes implements the "infrastructure as code" concept. When you create a Deployment, you're essentially providing a YAML manifest that describes your desired state.

When you perform a rolling update, the Deployment creates a new ReplicaSet with the updated Pod specifications while gradually scaling down the old ReplicaSet.