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

kubectl get dns -n kube-system

Answer

kubectl describe service <service-name> --dns

Answer

kubectl logs -n kube-system -l k8s-app=kube-dns

Question 2

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

Accepted Answer

/etc/kubernetes/manifests/

Answer

/var/lib/kubelet/manifests/

Answer

/etc/kubernetes/static-pods/

Answer

/usr/share/kubernetes/manifests/

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 stop deployment <name>

Answer

kubectl delete deployment <name> --keep-config

Answer

kubectl pause deployment <name>

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

Restart the kubelet service on the node

Answer

kubectl kill pod <name>

Answer

systemctl restart containerd on the node

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

The pod failed to start due to an invalid configuration

Answer

The pod's image was removed from the node's local cache

Answer

The pod was evicted due to high CPU usage on the node

Question 6

Which command shows which node each pod is running on along with its IP address?

Accepted Answer

kubectl get pods -o wide

Answer

kubectl get pods -o yaml

Answer

kubectl describe pods --network

Answer

kubectl get pods --ip

Question 7

Which command correctly restores an etcd cluster from a snapshot backup?

Accepted Answer

etcdctl snapshot restore /backup/etcd-snapshot.db --data-dir=/var/lib/etcd-restored

Answer

kubectl restore etcd --snapshot /backup/etcd-snapshot.db

Answer

cp /backup/etcd-snapshot.db /var/lib/etcd/member/snap/db

Answer

etcdctl restore /backup/etcd-snapshot.db --target=/var/lib/etcd