KCNA Scheduling and Scaling 2

Question 1

Which field in a Pod spec allows you to specify a custom scheduler instead of the default one?

Accepted Answer

schedulerName

Answer

The `schedulerName` field in a Pod's spec tells Kubernetes which scheduler should bind the pod to a node.

Question 2

A node has the taint `env=prod:NoExecute`. Which toleration allows an existing pod to remain on that node?

Accepted Answer

key: env, operator: Equal, value: prod, effect: NoExecute

Answer

A NoExecute toleration must match the taint's key, value, and effect exactly to prevent eviction of an already-running pod.

Question 3

What does the `minAvailable` field in a PodDisruptionBudget specify?

Accepted Answer

The minimum number of pods that must remain available during a voluntary disruption

Answer

`minAvailable` defines how many pods (absolute or percentage) must stay running when voluntary disruptions occur.

Question 4

A VerticalPodAutoscaler in 'Off' mode does which of the following?

Accepted Answer

Computes recommendations without applying them

Answer

'Off' mode causes VPA to calculate and expose resource recommendations without modifying any pods.

Question 5

Which Kubernetes object defines the relative priority of pods when the scheduler must preempt lower-priority pods?

Accepted Answer

PriorityClass

Answer

A PriorityClass assigns an integer priority value to pods; the scheduler uses this to determine which pods to preempt when resources are scarce.

(KCNA) Kubernetes and Cloud Native Associate Practice Test