KCNA Kubernetes Architecture & Components

Question 1

What is the primary function of the Kubernetes control plane?

Accepted Answer

To manage the overall state of the cluster

Answer

The Kubernetes control plane acts as the brain of the cluster, making global decisions about scheduling, detecting and responding to cluster events, and maintaining the desired state. It ensures that the cluster operates as intended by continuously reconciling the actual state with the desired state defined by users.

Question 2

Which component in Kubernetes is responsible for scheduling the pods?

Accepted Answer

Scheduler

Answer

The Kubernetes Scheduler is a control plane component that watches for newly created Pods with no assigned node. It then selects an optimal node for each Pod to run on, considering factors like resource requirements, hardware constraints, affinity/anti-affinity specifications, and node taints/tolerations.

Question 3

What is the role of the Kubelet in Kubernetes?

Accepted Answer

To ensure containers are running

Answer

The Kubelet is an agent that runs on each worker node in a Kubernetes cluster. Its primary role is to ensure that containers within Pods are running and healthy, communicating with the control plane to receive Pod specifications and managing the lifecycle of containers on its node.

Question 4

Which component stores the cluster's state in Kubernetes?

Accepted Answer

etcd

Answer

etcd is a highly available key-value store that serves as Kubernetes' backing store for all cluster data. It stores the entire configuration and state of the Kubernetes cluster, including information about Pods, Services, Deployments, and other resources, making it a critical component for cluster operation.

Question 5

What is the purpose of Kubernetes namespaces?

Accepted Answer

To organize and group resources

Answer

Kubernetes namespaces provide a mechanism for isolating groups of resources within a single cluster. They are used to divide cluster resources among multiple users or teams, allowing for logical separation and preventing naming collisions, which is crucial for managing complex environments.

(KCNA) Kubernetes and Cloud Native Associate Practice Test

(KCNA) Kubernetes and Cloud Native Associate Practice Test

KCNA Kubernetes Architecture & Components