CKA Cluster Maintenance 5

Question 1

What does 'kubectl cordon' do to a node, and how does it differ from 'kubectl drain'?

Accepted Answer

Cordon marks the node unschedulable without evicting pods; drain also evicts existing pods

Answer

Cordon deletes pods; drain only marks the node unschedulable

Answer

Both commands are identical in behavior

Answer

Cordon removes the node from the cluster; drain keeps it registered

Question 2

Which Kubernetes object can prevent kubectl drain from evicting pods below a specified availability threshold?

Accepted Answer

PodDisruptionBudget

Answer

ResourceQuota

Answer

LimitRange

Answer

PriorityClass

Question 3

You are upgrading a node's kubelet. What must you do immediately after installing the new kubelet package?

Accepted Answer

Reload systemd daemon and restart kubelet (daemon-reload && systemctl restart kubelet)

Answer

Run kubeadm upgrade apply on the node

Answer

Run kubectl apply to push the new version

Answer

Reboot the node to apply changes

Question 4

What is the purpose of etcd compaction in cluster maintenance?

Accepted Answer

Reclaims storage by removing old revision history from the etcd keyspace

Answer

Encrypts etcd data at rest

Answer

Merges multiple etcd members into one

Answer

Compresses the etcd snapshot file

Question 5

Which condition in kubectl get nodes output indicates that a node's kubelet has stopped sending heartbeats?

Accepted Answer

Ready=False or Ready=Unknown

Answer

NotReady=True

Answer

Unreachable=True

Answer

HeartbeatFailed=True

Question 6

During a kubeadm upgrade, which component is upgraded last on the control plane node?

Accepted Answer

kubelet

Answer

kube-apiserver

Answer

etcd

Answer

kube-scheduler

Question 7

A cluster administrator wants to schedule maintenance pods exclusively on a specific node. Which approach is correct?

Accepted Answer

Use kubectl cordon on all other nodes so only the target accepts pods

Answer

Label the node and use nodeSelector in the pod spec

Answer

Drain all other nodes and leave only the target node schedulable

Answer

Apply a taint to the target node with NoExecute effect