KCNA Kubernetes Architecture & Components 2

Question 1

Which component is responsible for watching for newly created Pods with no assigned node and selecting a node for them to run on?

Accepted Answer

kube-scheduler

Answer

The kube-scheduler watches for newly created Pods and selects the best node for them based on resource requirements and constraints.

Question 2

What is the primary function of etcd in a Kubernetes cluster?

Accepted Answer

Serving as a consistent and highly-available key-value store for all cluster data

Answer

etcd is a distributed key-value store that serves as Kubernetes' backing store for all cluster state and configuration data.

Question 3

Which Kubernetes component runs on every node and ensures containers are running in a Pod?

Accepted Answer

kubelet

Answer

The kubelet is a node agent that runs on every node and ensures the containers described in PodSpecs are running and healthy.

Question 4

What does the Node Controller in kube-controller-manager do when a node becomes unreachable?

Accepted Answer

Marks the node as NotReady and eventually evicts Pods after a timeout

Answer

The Node Controller marks unreachable nodes as NotReady and, after a configurable eviction timeout (default 5 minutes), evicts Pods from those nodes.

Question 5

Which communication pattern does the kubelet use to report node and pod status?

Accepted Answer

kubelet reports to the kube-apiserver via HTTPS

Answer

The kubelet communicates with the kube-apiserver over HTTPS, both to receive Pod specs and to report status updates.

(KCNA) Kubernetes and Cloud Native Associate Practice Test