CKA Kubernetes Cluster Troubleshooting Quiz

1. The scheduler is not assigning pods to nodes. Which component logs should you check?

Kube-scheduler logs

Kubelet logs

Kube-controller-manager logs

Coredns logs

2. A pod cannot pull its image from a private registry. What should be configured?

ImagePullSecrets in the pod spec

PersistentVolume for the image

Service account permissions

Node selector labels

3. High CPU usage is observed on a node. Which tool helps identify the consuming pod?

Kubectl top pod --all-namespaces

Kubectl describe node

Kubectl get events

Kubectl logs kubelet

4. A LoadBalancer service has a pending external IP. What is the usual reason?

No cloud provider or load balancer controller is configured

Pod is not running

Kubelet is down

Etcd is full

5. A pod's init container fails but the main container never starts. What command shows the init container logs?

Kubectl logs -c

Kubectl describe pod

Kubectl logs --previous

Kubectl get pod -o yaml

6. The kubelet on a node stops responding. Which systemd command restarts it?

Systemctl restart kubelet

Kubectl restart node

Systemctl restart docker

Docker restart kubelet

7. A pod is in 'CrashLoopBackOff' state. What does this indicate?

Container exits repeatedly and kubelet keeps restarting it

Pod is waiting for sufficient resources

Network plugin is unavailable

Node is being cordoned

8. Cluster communication between master and worker nodes fails. What port is typically blocked?

6443 (API server)

8080 (HTTP)

2379 (etcd)

10250 (kubelet)

9. A stateful pod cannot start because its PVC is in 'Pending'. What is the most likely cause?

No storage provisioner available

Pod has too many replicas

Node has insufficient CPU

Image pull failed

10. DNS resolution fails inside a pod. What is the typical issue?

CoreDNS pods are not running or misconfigured

Kubelet is using wrong --cluster-dns flag

Pod has no requests defined

Node is NotReady

11. A pod remains in 'Pending' state. Which command shows the reason for the pending status?

Kubectl describe pod

Kubectl logs

Kubectl get pod -o yaml

Kubectl exec -- ps aux

12. A pod has resource requests but is still pending. What should you verify?

Available node resources match or exceed requests

Image registry is accessible

Network plugin is installed

Storage provisioner is running

13. Pods are evicted due to low disk space. What status condition indicates this?

DiskPressure

MemoryPressure

OutOfDisk

StorageUnavailable

14. A service cannot reach backend pods. Which command verifies the service selector matches pod labels?

Kubectl get endpoints

Kubectl logs

Kubectl describe service

Kubectl get services -o wide

15. The API server is unresponsive. Which component should you check first?

Etcd database status and connectivity

Worker node memory

Pod network plugin

Kubelet on master node

16. A deployment shows 0/3 replicas ready. Which field in 'kubectl describe deployment' helps identify the issue?

Replicas field only

Conditions and Events sections

Image field only

Selector field only

17. Pod communication fails between namespaces. What is the most likely cause?

Network policy is restricting traffic

Pods have insufficient CPU

Node is out of disk space

Kubelet is not running

18. A container crashes immediately after starting. Where should you check logs?

Kubectl logs --previous

Kubectl describe node

Kubectl get events

Kubelet service status

19. Which metric indicates insufficient memory on a node?

MemoryPressure condition

DiskPressure condition

NetworkUnavailable condition

PIDPressure condition

20. A node shows 'NotReady' status. What is the first troubleshooting step?

Reboot the node immediately

Check kubelet logs on the node

Delete and recreate the node

Drain all pods from the cluster