KCNA Cloud Native Application Delivery Practice Question
A Kubernetes Deployment is configured with 'strategy.type: RollingUpdate'. The team wants to ensure that during an update, no more than 25% of pods are unavailable at any time. Which specification should be added?
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
✓
strategy.rollingUpdate.maxUnavailable: 25%
The 'maxUnavailable' field in the rolling update strategy controls how many pods can be unavailable during the update. Setting it to 25% ensures at most 25% are down.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
spec.minReadySeconds: 30
Why it's wrong here
minReadySeconds delays readiness after pod starts, not availability during update.
- ✗
spec.replicas: 4
Why it's wrong here
Replicas set the desired number of pods, not the update strategy.
- ✓
strategy.rollingUpdate.maxUnavailable: 25%
Why this is correct
maxUnavailable sets the maximum number of pods that can be unavailable during a rolling update.
- ✗
strategy.rollingUpdate.maxSurge: 25%
Why it's wrong here
maxSurge controls how many extra pods can be created above the desired count, not unavailability.
Go deeper
Related to this question
Learn chapter
Kubernetes Overview and Core Components
Key term
Kubernetes API Primitives
Kubernetes API Primitives are the basic building blocks that the Kubernetes API uses to represent and manage the state of a cluster, such as Pods, Services, Deployments, and Namespaces.
Key term
ReplicaSet and Replication
A ReplicaSet ensures a specified number of identical pod instances are running at all times in Kubernetes, using replication to maintain availability and stability.
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