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Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam Sample Questions (Q74-Q79):
NEW QUESTION # 74
Given a partially-functioning Kubernetes cluster, identify symptoms of failure on the cluster.
Determine the node, the failing service, and take actions to bring up the failed service and restore the health of the cluster. Ensure that any changes are made permanently.
You can ssh to the relevant I nodes (
[student@node-1] $ ssh <nodename
You can assume elevated privileges on any node in the cluster with the following command:
[student@nodename] $ | sudo -i
Answer:
Explanation:
See the solution below.
Explanation
solution
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F:WorkData Entry WorkData Entry00827CKA E.JPG
NEW QUESTION # 75
You have a StatefulSet named 'mysql-cluster' running a MySQL database with 3 replicas. You want to add a new replica to the cluster without disrupting the existing database operations. How do you achieve this while ensuring data consistency and minimal downtime?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Scale up the StatefulSet:
- Increase the 'replicas' value in the StatefulSet definition from 3 to 4. Apply the change using 'kubectl apply -f mysql-cluster.yaml'
2. Wait for the new pod to be created: - Monitor the pod creation process using 'kubectl get pods -l app=mysql-cluster'. Wait for the new pod to be created and enter a ready state. 3. Join the new pod to the cluster: - In the new pod's shell, execute the following command to join the existing MySQL cluster: Bash mysql -h -u -p -e "CHANGE MASTER TO MASTER PASSWORD=", MASTER DELAY=O" - Replace with the IP address of one of the existing MySQL replicas. - Replace , and '3306' with the appropriate values for your MySQL setup. 4. Verify the new replica is synchronized: - Use "SHOW SLAVE STATUS" command on the new replica to verify that it's successfully replicating data from the existing cluster. Ensure that the 'Slave 10 Running' and 'Slave SQL Running' statuses are both set to 'Yes'. 5. Promote the new replica: - Promote the new replica to a full member of the cluster by updating the StatefulSet definition to include the new pod's hostname. This will typically involve adding a new entry to the 'volumeClaimTemplates' section of the StatefulSet. 6. Test the cluster's health: - Run a series of read and write operations on the database to verify that the new replica is fully integrated and responding correctly. 7. Remove the old pod: - You can now delete the old pod that had the lowest pod index. This will trigger the automatic cleanup of the old volume, ensuring that only the healthy and synchronized replicas remain. By following these steps, you can add a new replica to your MySQL cluster while ensuring minimal downtime and preserving data consistency. ]
NEW QUESTION # 76
Scale down the deployment to 1 replica
Answer:
Explanation:
kubectl scale deployment webapp -replicas=1 //Verify kubectl get deploy kubectl get po,rs
NEW QUESTION # 77
Score: 4%
Task
Set the node named ek8s-node-1 as unavailable and reschedule all the pods running on it.
Answer:
Explanation:
See the solution below.
Explanation
SOLUTION:
[student@node-1] > ssh ek8s
kubectl cordon ek8s-node-1
kubectl drain ek8s-node-1 --delete-local-data --ignore-daemonsets --force
NEW QUESTION # 78
// Create a configmap
kubectl create configmap redis-config --from-file=/opt/redisconfig
// Verify
kubectl get configmap redis-config -o yaml
// first run this command to save the pod yml
kubectl run redis-pod --image=redis --restart=Always --dry-run
-o yaml > redis-pod.yml
// edit the yml to below file and create
apiVersion: v1
kind: Pod
metadata:
name: redis
spec:
containers:
- name: redis
image: redis
env:
- name: MASTER
value: "true"
ports:
- containerPort: 6379
volumeMounts:
- mountPath: /redis-master-data
name: data
- mountPath: /redis-master
name: config
volumes:
- name: data
emptyDir: {}
- name: config
configMap:
name: example-redis-config
- A. items:
- key: redis-config
path: redis.conf
cf
// // Verify
K kubectl exec -it redis - cat /redis-master-data/redis.conf
- B. items:
- key: redis-config
path: redis.conf
cf
kk kubectl apply -f redis-pod.yml
// // Verify
K kubectl exec -it redis - cat /redis-master-data/redis.conf
Answer: B
NEW QUESTION # 79
......
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