KCNA Scheduling and Scaling 4

Question 1

What is the effect of setting `preemptionPolicy: Never` on a PriorityClass?

Accepted Answer

Pods with this class will not preempt lower-priority pods even if resources are unavailable

Answer

`preemptionPolicy: Never` prevents pods in this PriorityClass from evicting lower-priority pods, though they are still queued ahead of them.

Question 2

A DaemonSet pod is running on every node. What happens when a new node joins the cluster?

Accepted Answer

The DaemonSet controller automatically schedules a pod on the new node

Answer

The DaemonSet controller watches for new nodes and automatically creates a pod on each one that matches its selector (or all nodes if no selector is set).

Question 3

Which resource in Kubernetes allows you to set default CPU and memory requests/limits for containers that don't specify them?

Accepted Answer

LimitRange

Answer

A LimitRange can define default and maximum resource constraints that are applied to containers in a namespace when none are specified.

Question 4

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

Accepted Answer

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

Answer

`maxSurge` limits how many additional pods can be created beyond the desired count during a rolling update, controlling update speed.

Question 5

Which condition must be true for the Cluster Autoscaler to add a new node?

Accepted Answer

A pod is Pending because no existing node has sufficient resources to schedule it

Answer

Cluster Autoscaler triggers scale-up specifically when pods are stuck in Pending state due to insufficient resources on existing nodes.

(KCNA) Kubernetes and Cloud Native Associate Practice Test

(KCNA) Kubernetes and Cloud Native Associate Practice Test

KCNA Scheduling and Scaling 4