CKA Workload Management and Scheduling Flashcards

What is the relationship between a Deployment and a ReplicaSet in Kubernetes?

Answer: A Deployment creates and manages ReplicaSets to achieve rolling updates and rollbacks

A Deployment manages one or more ReplicaSets and coordinates rolling updates by creating a new ReplicaSet and scaling it up while scaling down the old one.

Which kubectl command triggers a rolling update on a Deployment by changing its container image?

Answer: kubectl set image deployment/ =

The `kubectl set image` command updates a container's image in a running Deployment, triggering a rolling update automatically.

How do you roll back a Deployment to its previous revision in Kubernetes?

Answer: kubectl rollout undo deployment/

The `kubectl rollout undo deployment/` command reverts the Deployment to its previous revision by scaling up the old ReplicaSet.

What does the 'maxSurge' field in a Deployment's rolling update strategy control?

Answer: The maximum number of extra Pods that can exist above the desired replica count during an update

maxSurge sets how many additional Pods beyond the desired count may run simultaneously during a rolling update, allowing new Pods to start before old ones terminate.

Which command shows the rollout history of a Kubernetes Deployment?

Answer: kubectl rollout history deployment/

The `kubectl rollout history deployment/` command lists previous revisions of the Deployment along with their change causes.

What is the purpose of the 'minReadySeconds' field in a Deployment spec?

Answer: Specifies how many seconds a new Pod must be ready before it is considered available

minReadySeconds defines the minimum time (after a Pod becomes ready) that must elapse before the Pod is counted as available, preventing hasty rollout progression.