KCNA Pod Management & Scheduling 2

Question 1

Which field in a Pod spec defines the list of init containers that run before app containers start?

Accepted Answer

initContainers

Answer

The `initContainers` field in the Pod spec lists containers that run to completion sequentially before any app containers start.

Question 2

A Pod is in 'Pending' state for a long time. Which kubectl command best helps diagnose why it hasn't been scheduled?

Accepted Answer

kubectl describe pod <name>

Answer

`kubectl describe pod` shows Events section with scheduler messages explaining why a pod cannot be placed.

Question 3

What is the purpose of a PodDisruptionBudget (PDB)?

Accepted Answer

Limit voluntary disruptions by ensuring a minimum number of pods remain available

Answer

A PDB guarantees that a minimum number (or percentage) of pods stay available during voluntary disruptions like node drains.

Question 4

Which scheduling feature allows you to spread pods evenly across failure domains like zones?

Accepted Answer

Topology Spread Constraints

Answer

Topology Spread Constraints use `topologyKey` to balance pod distribution across zones, nodes, or other topology domains.

Question 5

In a multi-container Pod, how do containers share the network namespace by default?

Accepted Answer

All containers in a Pod share the same network namespace and IP

Answer

All containers within a Pod share one network namespace, meaning they share the same IP and can reach each other via localhost.

(KCNA) Kubernetes and Cloud Native Associate Practice Test