What occurs during a rolling update using a Deployment in Kubernetes?

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During a rolling update using a Deployment in Kubernetes, the correct answer involves the creation of a new ReplicaSet, which increases its replica count gradually as it brings up new Pods with the updated configuration. The rolling update process ensures that the new version of the application is deployed with minimal downtime and without disrupting the overall service.

As a part of this update, the Deployment controller starts by creating a new ReplicaSet with the desired state for the updated Pods. The ReplicaSet begins to scale up while simultaneously scaling down the old ReplicaSet, allowing both versions to coexist temporarily. This means that existing Pods from the old version continue to serve traffic until the new Pods are ready, at which point the old Pods are terminated one at a time.

This gradual transition is key to achieving zero-downtime updates, allowing traffic to flow seamlessly to the replicas of the new version without causing interruptions. The overall strategy focuses on maintaining high availability throughout the update process.

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