KCNA Cloud Native Application Delivery Practice Question
An application deployment in Kubernetes uses a Deployment object. During a rolling update, the new ReplicaSet fails to become healthy. What is the default behavior of the Deployment controller?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It pauses the rollout and keeps the old ReplicaSet running
By default, the Deployment controller will stop the rollout if the new pods are unhealthy, and the old ReplicaSet remains running.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It continues the rollout, ignoring the health check failures
Why it's wrong here
The controller respects health checks and will not proceed if new pods are unhealthy.
- ✗
It automatically rolls back to the previous revision
Why it's wrong here
Automatic rollback is not default; it requires a rollout undo command or a specific configuration.
- ✗
It scales down the old ReplicaSet to zero
Why it's wrong here
Scaling down the old ReplicaSet would cause downtime; the controller preserves the old version.
- ✓
It pauses the rollout and keeps the old ReplicaSet running
Why this is correct
By default, the Deployment controller will pause the rollout, leaving the old ReplicaSet active.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This KCNA practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the KCNA exam.