CKA Troubleshooting 2

Question 1

A pod's status shows 'ImagePullBackOff'. What is the most likely cause?

Accepted Answer

The container image cannot be pulled due to a wrong name, tag, or missing credentials

Answer

The pod has insufficient CPU resources allocated

Answer

The node running the pod has run out of disk space

Answer

A required ConfigMap referenced by the pod does not exist

Question 2

Which command checks the health of etcd cluster members?

Accepted Answer

etcdctl endpoint health --endpoints= --cacert= --cert= --key=

Answer

kubectl get pods -n kube-system -l component=etcd

Answer

kubectl describe etcd -n kube-system

Answer

systemctl status etcd

Question 3

A service exists but pods are not receiving traffic. What should you check first?

Accepted Answer

Whether the service's selector labels match the pod's labels

Answer

Whether the pod's namespace matches the service namespace

Answer

Whether the pod has sufficient resource requests defined

Answer

Whether the node has a valid external IP address assigned

Question 4

How do you check the expiration date of the API server certificate on a kubeadm cluster?

Accepted Answer

Both B and C are valid methods

Answer

kubectl get secret kube-apiserver-cert -n kube-system

Answer

openssl x509 -noout -dates -in /etc/kubernetes/pki/apiserver.crt

Answer

kubeadm certs check-expiration

Question 5

A node is showing 'DiskPressure' condition as True. What does this mean?

Accepted Answer

The node has less available disk space than the kubelet eviction threshold requires

Answer

The node's CPU usage is above the eviction threshold

Answer

The node's memory usage is critically high

Answer

The node cannot communicate with the API server

Question 6

Which kubectl flag allows you to watch a resource for changes in real-time?

Accepted Answer

kubectl get pods -w

Answer

kubectl get pods --refresh

Answer

kubectl watch pods

Answer

kubectl monitor pods

Question 7

What is the correct command to create an etcd snapshot backup?

Accepted Answer

etcdctl snapshot save /backup/etcd-snapshot.db --endpoints= --cacert= --cert= --key=

Answer

cp -r /var/lib/etcd /backup/etcd

Answer

kubectl backup etcd -n kube-system

Answer

kubeadm backup etcd --snapshot /backup/etcd.db