Kubernetes Container Orchestration Scheduling and Scaling 4

Question 1

Which Cluster Autoscaler behavior causes it to scale down a node group even if pods on the node are not reschedulable?

Accepted Answer

--skip-nodes-with-local-storage=false

Answer

By default, Cluster Autoscaler won't remove nodes with pods using local storage; setting this flag to false overrides that safety check.

Question 2

A pod spec has both `resources.requests.cpu: 500m` and `resources.limits.cpu: 500m`. What QoS class is assigned to this pod?

Accepted Answer

Guaranteed

Answer

When requests equal limits for all containers and all resource types, Kubernetes assigns the Guaranteed QoS class.

Question 3

What is the purpose of the `--horizontal-pod-autoscaler-sync-period` flag on the kube-controller-manager?

Accepted Answer

How often HPA fetches metrics and recalculates replica counts

Answer

This flag (default 15s) controls how frequently the HPA controller queries metrics and evaluates whether to scale.

Question 4

You apply a taint `node.kubernetes.io/not-ready:NoExecute` to a node. What happens to already-running pods without a matching toleration?

Accepted Answer

They are evicted after the toleration seconds timeout (default 300s)

Answer

NoExecute taints evict existing pods; if no tolerationSeconds is specified, Kubernetes defaults to 300 seconds before eviction.

Question 5

Which field in a TopologySpreadConstraint controls how unbalanced pod distribution across topology zones is allowed?

Accepted Answer

maxSkew

Answer

maxSkew defines the maximum allowed difference in pod count between the most and least populated topology domains.

Kubernetes Container Orchestration Practice Test