CKA Troubleshooting 3

Question 1

A pod is running but your application cannot connect to a service by name. Which command helps verify DNS resolution from inside the cluster?

Accepted Answer

kubectl exec -it -- nslookup

Answer

Running nslookup inside the pod verifies whether cluster DNS resolution is working correctly for the service name from within the pod's network namespace.

Question 2

Which directory on a kubeadm cluster contains the static pod manifests for control plane components?

Accepted Answer

/etc/kubernetes/manifests/

Answer

Kubeadm places static pod YAML manifests for kube-apiserver, kube-controller-manager, and kube-scheduler in /etc/kubernetes/manifests/, which the kubelet watches directly.

Question 3

You need to temporarily suspend a deployment's pods for troubleshooting without deleting the deployment. Which command achieves this?

Accepted Answer

kubectl scale deployment <name> --replicas=0

Answer

kubectl scale with --replicas=0 terminates all running pods while preserving the deployment configuration, effectively suspending it.

Question 4

A pod is stuck in 'Terminating' state for a long time and won't delete. What is the recommended approach to force remove it?

Accepted Answer

kubectl delete pod <name> --force --grace-period=0

Answer

Combining --force with --grace-period=0 immediately removes a stuck terminating pod from the API server without waiting for graceful shutdown.

Question 5

What does 'OOMKilled' in a pod's last state indicate?

Accepted Answer

The pod was killed because it exceeded its memory limit

Answer

OOMKilled means the container was terminated by the Linux kernel's Out Of Memory killer because it exceeded its configured memory limit.

(CKA) Certified Kubernetes Associate Practice Test

(CKA) Certified Kubernetes Associate Practice Test

CKA Troubleshooting 3