Which statement best describes RollingUpdate in Kubernetes Deployments?

Which statement best describes RollingUpdate in Kubernetes Deployments?

• A. RollingUpdate replaces all pods simultaneously.
• B. RollingUpdate destroys the deployment.
• C. RollingUpdate automatically creates a new namespace.
• D. RollingUpdate updates pods incrementally while maintaining availability.

Answer: (D)

RollingUpdate updates pods incrementally while maintaining availability. In a Deployment, when you change the pod template (for example, a new image), Kubernetes creates a new ReplicaSet for the updated pods and slowly scales it up while scaling the old ReplicaSet down. This gradual rollout keeps some pods serving traffic at all times, so the service remains available. The speed and behavior of the rollout are controlled by settings like maxUnavailable and maxSurge, which determine how many pods can be unavailable or created above the desired count at any moment. If a new pod isn’t ready, the rollout pauses until it becomes healthy, reinforcing the availability guarantee. It isn’t replacing all pods at once, it isn’t destroying the deployment, and it doesn’t create new namespaces.

RollingUpdate updates pods incrementally while maintaining availability. In a Deployment, when you change the pod template (for example, a new image), Kubernetes creates a new ReplicaSet for the updated pods and slowly scales it up while scaling the old ReplicaSet down. This gradual rollout keeps some pods serving traffic at all times, so the service remains available. The speed and behavior of the rollout are controlled by settings like maxUnavailable and maxSurge, which determine how many pods can be unavailable or created above the desired count at any moment. If a new pod isn’t ready, the rollout pauses until it becomes healthy, reinforcing the availability guarantee. It isn’t replacing all pods at once, it isn’t destroying the deployment, and it doesn’t create new namespaces.