CKA Resource Monitoring 3

Question 1

In Kubernetes, what does a QoS class of 'Burstable' mean for a pod?

Accepted Answer

At least one container has requests set but requests do not equal limits

Answer

A Burstable pod has at least one container with resource requests defined, but the requests and limits are not equal for all containers.

Question 2

Which QoS class is the LAST to be evicted when a node is under resource pressure?

Accepted Answer

Guaranteed

Answer

Guaranteed pods have the highest priority and are the last to be evicted; BestEffort pods are evicted first, followed by Burstable pods.

Question 3

A Metrics Server is installed and running, but 'kubectl top pods' returns 'Error from server (ServiceUnavailable)'. What is the most likely cause?

Accepted Answer

The Metrics Server pod is not yet ready or its aggregation API is not registered

Answer

If the Metrics Server pod is not ready or its APIService is not registered with the aggregation layer, the kube-apiserver returns ServiceUnavailable for metrics endpoints.

Question 4

What flag must be passed to 'kubectl top pods' to also display metrics for init containers?

Accepted Answer

--containers

Answer

The '--containers' flag causes kubectl top pods to show per-container metrics, including init containers alongside regular containers.

Question 5

A ResourceQuota is set in a namespace with 'requests.cpu: 4'. What happens when a new pod requests 1 CPU but the total existing requests are already 4 CPU?

Accepted Answer

The pod creation is rejected with a 'forbidden: exceeded quota' error

Answer

ResourceQuota is enforced at admission time; if the quota is exhausted, the API server rejects the new pod creation request.

(CKA) Certified Kubernetes Associate Practice Test

(CKA) Certified Kubernetes Associate Practice Test

CKA Resource Monitoring 3