CKA Cluster Maintenance 4

Question 1

Which kubeadm command is run on a worker node during a cluster upgrade (after the control plane is already upgraded)?

Accepted Answer

kubeadm upgrade node

Answer

kubeadm upgrade node updates the node's configuration to match the new control plane version without a full rejoin.

Question 2

What is the purpose of the node-monitor-grace-period setting in kube-controller-manager?

Accepted Answer

How long to wait before marking a node as NotReady after losing heartbeats

Answer

node-monitor-grace-period defines how long the controller manager waits without a kubelet heartbeat before changing node status to NotReady.

Question 3

You need to check the etcd cluster health. Which etcdctl command and flag combination is correct?

Accepted Answer

etcdctl endpoint health

Answer

etcdctl endpoint health checks the health of each etcd endpoint and reports whether each member is healthy.

Question 4

A Kubernetes node shows MemoryPressure=True condition. What does the kubelet do in response?

Accepted Answer

Stops accepting new pods and begins evicting lowest-priority pods

Answer

Under MemoryPressure, the kubelet begins evicting pods based on QoS class (BestEffort first, then Burstable) to reclaim memory.

Question 5

Which file on a kubeadm cluster stores the kubeadm configuration used during 'kubeadm init'?

Accepted Answer

A ConfigMap named kubeadm-config in kube-system namespace

Answer

kubeadm stores the cluster configuration in a ConfigMap named kubeadm-config in the kube-system namespace for use during upgrades.

(CKA) Certified Kubernetes Administrator Practice Test