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 only adds the unschedulable taint, while drain additionally evicts existing pods before maintenance.

Question 2

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

Accepted Answer

PodDisruptionBudget

Answer

A PodDisruptionBudget enforces minAvailable or maxUnavailable constraints, causing drain to wait until the budget allows eviction.

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

After package installation, systemctl daemon-reload reloads the unit file and systemctl restart kubelet starts the new binary.

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

Compaction removes superseded key revisions from etcd's MVCC store, freeing space and preventing the database from growing unbounded.

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

When heartbeats stop, the node condition Ready transitions to Unknown (timeout) or False (kubelet reported not ready); there is no 'NotReady' condition type.

(CKA) Certified Kubernetes Administrator Practice Test

(CKA) Certified Kubernetes Administrator Practice Test

CKA Cluster Maintenance 5