CKA Troubleshooting

Question 1

How do you view logs for a specific container named 'nginx' in a multi-container pod named 'mypod'?

Accepted Answer

kubectl logs mypod -c nginx

Answer

kubectl logs mypod --container=nginx --all

Answer

kubectl describe pod mypod -c nginx

Answer

kubectl get logs mypod nginx

Question 2

A pod is stuck in the 'Pending' state. Which command provides the most useful diagnostic information?

Accepted Answer

kubectl describe pod <pod-name>

Answer

kubectl get pods -o wide

Answer

kubectl logs <pod-name>

Answer

kubectl exec -it <pod-name> -- /bin/sh

Question 3

What does the 'CrashLoopBackOff' status indicate for a pod?

Accepted Answer

The pod's container repeatedly crashes and Kubernetes is backing off restart attempts

Answer

The pod is waiting for a PersistentVolume to be provisioned

Answer

The pod failed to pull its container image from the registry

Answer

The pod was evicted due to node memory pressure

Question 4

Which command lists events in a specific namespace sorted chronologically?

Accepted Answer

kubectl get events -n <namespace> --sort-by='.lastTimestamp'

Answer

kubectl describe events -n <namespace>

Answer

kubectl logs events -n <namespace>

Answer

kubectl get pods -n <namespace> --events

Question 5

A node shows 'NotReady' in kubectl get nodes. Which command gives the most detail about the node's condition?

Accepted Answer

kubectl describe node <node-name>

Answer

kubectl logs node/<node-name>

Answer

kubectl get node <node-name> -o yaml

Answer

kubectl top node <node-name>

Question 6

You need a temporary interactive debug pod to troubleshoot network connectivity in the cluster. Which command is most appropriate?

Accepted Answer

kubectl run debug --image=busybox --restart=Never --rm -it -- /bin/sh

Answer

kubectl create debug --image=busybox -it

Answer

kubectl apply -f debug-pod.yaml --interactive

Answer

kubectl exec debug -- /bin/sh

Question 7

Where are kubelet logs found on a systemd-based Linux node?

Accepted Answer

journalctl -u kubelet

Answer

/var/log/kubelet.log

Answer

/etc/kubernetes/logs/kubelet.log

Answer

kubectl logs -n kube-system kubelet