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Linux Foundation CKA Exam Syllabus Topics:

SectionWeightObjectives
Storage10%- PersistentVolumes and PersistentVolumeClaims
- Storage classes
Services & Networking20%- Ingress configuration
- Services (ClusterIP, NodePort, LoadBalancer)
- Network policies
Troubleshooting30%- Cluster component troubleshooting
- Application and networking debugging
Cluster Architecture, Installation & Configuration25%- High availability setup
- Cluster installation and configuration
- Kubernetes architecture components
Workloads & Scheduling15%- Deployments and rolling updates
- ConfigMaps and Secrets
- Scheduling constraints

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Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam Sample Questions (Q77-Q82):

NEW QUESTION # 77
Score: 7%

Task
First, create a snapshot of the existing etcd instance running at https://127.0.0.1:2379, saving the snapshot to
/srv/data/etcd-snapshot.db.

Next, restore an existing, previous snapshot located at /var/lib/backup/etcd-snapshot-previo us.db

Answer:

Explanation:
Solution:
#backup
ETCDCTL_API=3 etcdctl --endpoints="https://127.0.0.1:2379" --cacert=/opt/KUIN000601/ca.crt --cert=/opt
/KUIN000601/etcd-client.crt --key=/opt/KUIN000601/etcd-client.key snapshot save /etc/data/etcd-snapshot.db
#restore
ETCDCTL_API=3 etcdctl --endpoints="https://127.0.0.1:2379" --cacert=/opt/KUIN000601/ca.crt --cert=/opt
/KUIN000601/etcd-client.crt --key=/opt/KUIN000601/etcd-client.key snapshot restore /var/lib/backup/etcd- snapshot-previoys.db


NEW QUESTION # 78
You have a StatefulSet named 'database-statefulset' that runs a database service. The database requires persistent data storage. You are experiencing a problem where the database pods are crashing repeatedly, and the database data is getting lost. You suspect that there is an issue with the persistent volume claim (PVC) used by the StatefulSet. How would you troubleshoot and potentially fix this problem?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Check the PVC:
- Use 'kubectl describe pvc (replace with the name of the PVC used by the 'database-statefulset') to check the PVC details.
- Look for any errors or warnings related to provisioning or access.
- Verify that the PVC's 'Status' field is 'Bound' (indicating the volume is successfully attached to a pod).
2. Investigate the Persistent Volume (PV):
- Use 'kubectl get pv' to list all persistent volumes in the cluster.
- Find the PV that is bound to your PVC (the PV's 'Claim' field should match the name of your PVC).
- Use 'kubectl describe pv to examine the details of the PV. Look for:
- StorageClass: Check if the storage class used by the PV is appropriate for the database workload (e.g., is it provisioned with enough capacity, appropriate 1/0 performance, etc.).
- AccessModes: Ensure the access modes of the PV match the requirements of the database (e.g.,
'ReadWriteOnce' if the database is a single instance).
- Errors: Look for any error messages or warnings related to the PV.
3. Examine Pod Logs:
- Use 'kubectl logs (replace with the name of a crashing database pod) to examine the pod's logs. Look for any error messages related to the volume or database startup.
4. Check for Pod Events:
- Use 'kubectl describe pod to check the events for the pod. Events might provide clues about why the pod is crashing or why the volume is not properly mounted.
5. Possible Solutions:
- Recreate the PVC: If there is an error with the PVC itself, you can try recreating it. Delete the existing PVC, and then create a new one with the same specifications.
- Update StorageClass: If the storage class is not appropriate, consider switching to a different storage class that better meets the database's requirements.
- Increase Storage Capacity: If the database runs out of storage, increase the storage capacity of the PVC.
- Change AccessModes: If the PV access modes are not compatible with the database, update the access modes to match.
- Repair or Replace the PV: If the PV itself has issues, consider repairing the volume (if possible) or replacing it with a new one.
6. Monitor and Iterate:
- After making any changes, monitor the database pods to see if they are now able to start and run without crashing.
- Make sure that the database data is being persisted correctly by checking the volume's contents.


NEW QUESTION # 79
Create a busybox pod which executes this command sleep 3600 with the service account admin and verify

Answer: B


NEW QUESTION # 80
List all the pods showing name and namespace with a json path expression

Answer:

Explanation:
kubectl get pods -o=jsonpath="{.items[*]['metadata.name', 'metadata.namespace']}"


NEW QUESTION # 81
Check the history of deployment

Answer:

Explanation:
kubectl rollout history deployment webapp


NEW QUESTION # 82
......

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