VALID FREE CKA EXAM ANSWER COLLECTION - CKA REAL VCE

Valid free CKA exam answer collection - CKA real vce

Valid free CKA exam answer collection - CKA real vce

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Tags: CKA Exam Book, CKA Online Training, CKA Dump Collection, CKA Valid Exam Papers, CKA Study Demo

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Linux Foundation Certified Kubernetes Administrator (CKA) Program is an industry-leading certification designed for IT professionals who want to prove their expertise in Kubernetes administration. Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications. The CKA program is designed to assess an individual’s skills in Kubernetes administration and to provide a certification that is recognized by the industry.

The CKA Certification Exam is a rigorous, performance-based assessment designed to evaluate an individual's knowledge and ability to install, configure, and manage Kubernetes clusters. CKA exam is conducted in a live, lab-based environment, which ensures that candidates have hands-on experience with Kubernetes and are able to demonstrate their proficiency in a real-world setting.

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Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam Sample Questions (Q79-Q84):

NEW QUESTION # 79
List the nginx pod with custom columns POD_NAME and POD_STATUS

Answer:

Explanation:
kubectl get po -o=custom-columns="POD_NAME:.metadata.name, POD_STATUS:.status.containerStatuses[].state"


NEW QUESTION # 80
You are running a stateful application using a StatefulSet. How do you ensure that the application data is preserved during a rolling update?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Use Persistent Volumes:
- Use Persistent Volumes (PVs) and Persistent Volume Claims (PVCs) to provide persistent storage for the stateful application data.
- Ensure that the PVCs are mounted to the pods in the StatefulSet.

2. Configure Rolling Updates: - Configure the StatefulSet's updateStrategy' to use a rolling update strategy. - Ensure that the 'updateStrategy.type' is set to 'RollingUpdate'. 3. Validate Data Preservation: - Perform a rolling update by updating the StatefulSet. - Validate that the application data is preserved during the update process. - Check the logs and application state to confirm that the data is intact.


NEW QUESTION # 81
Get the memory and CPU usage of all the pods and find out top 3 pods which have the highest usage and put them into the cpuusage.txt file

  • A. // Get the top 3 pods
    kubectl top pod --all-namespaces | sort --reverse --key 3 --
    numeric | head -8
    // putting into file
    kubectl top pod --all-namespaces | sort --reverse --key 6 --
    numeric | head -6 > cpu-usage.txt
    // verify
    cat cpu-usage.txt
  • B. // Get the top 3 pods
    kubectl top pod --all-namespaces | sort --reverse --key 3 --
    numeric | head -3
    // putting into file
    kubectl top pod --all-namespaces | sort --reverse --key 3 --
    numeric | head -3 > cpu-usage.txt
    // verify
    cat cpu-usage.txt

Answer: B


NEW QUESTION # 82
You have a Kubernetes cluster running with several pods, each exposed via a 'Service' of type LoadBalance. However, you notice some pods are randomly unreachable from external clients, despite appearing healthy in the cluster. You suspect this could be a network issue within the cluster. Describe the steps you would take to diagnose and troubleshoot this issue, focusing on network-related aspects of Kubernetes.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Verify Service Configuration:
- Use 'kubectl describe service ' to examine the service definition.
- Check if the 'externallPs are correctly configured and match the IPs assigned by your cloud provider.
- Ensure that the 'selector' in the service matches the labels on the pods you're trying to access.
2. Check Pod Connectivity:
- Use 'kubectl exec -it bash' to get a shell within one of the pods.
- Run 'ping ' to test connectivity from within the pod to the external IP of the service.
- If ping fails, it indicates that the pod can't reach the service's external IP.
3. Examine Network Policies:
- Check if any 'NetworkPolicy' rules are blocking traffic to or from the pods in question.
- Use 'kubectl get networkpolicies' and 'kubectl describe networkpolicy to list and examine policies.
4. Inspect Network Resources:
- Use "kubectl get nodes' to check the status of the nodes. Look for any node-level networking problems or errors.
- Examine network resource usage (e.g., bandwidth, CPU) on the nodes using tools like 'kubectl top nodes'.
5. Analyze Cluster Events:
- Check the Kubernetes event logs using 'kubectl get events'. Look for events related to networking issues, pod restarts, or other relevant events.
6. Inspect Network Connectivity (Node-Level):
- If the issue seems to originate within the cluster, use tools like 'ping' or 'traceroute' from within a node to test connectivity between nodes and/or to external services.
7. Verify Load Balancer Health:
- If using a cloud provider's load balancer, check its health status and logs. Ensure it's correctly forwarding traffic to the back-end pods.
8. Check Firewall Rules:
- Ensure that there are no external firewall rules blocking traffic to the Kubernetes cluster or specific ports used by the services.
9. Consider Network Plugin Configuration:
- Review the configuration of the network plugin used in your cluster (e.g., Calico, Flannel). Potential issues in the plugin's configuration might cause connectivity problems.
Example Scenario: Imagine you have a NodePort service 'my-service' exposing a web server. The service is configured to forward traffic to pods labeled 'app=web'. You're able to access the service from within the cluster but encounter random disconnections from external clients. Troubleshooting Steps:
1 . Verify the service definition to ensure 'externallPs' are correctly assigned and 'selector' matches pod label
2. 'kubectl exec -it bash' to ping the service's 'externallP'. If unsuccessful, proceed to step 3.
3. Check if any NetworkPolicies are blocking traffic to the 'web' pods.
4. Verify the health status of all nodes in the cluster.
5. Examine cluster events for any networking-related errors.
6. Use ping' and 'traceroute' from a node to test connectivity to the external service.
7. Check the health of the load balancer if it's being used.
8. Ensure no external firewall rules block traffic to the service's ports.
9. Inspect the configuration of the network plugin in your cluster for any potential issues.


NEW QUESTION # 83
You have a two-tier application with a frontend service 'frontend-svc' exposing a Node.js application running in pods labeled 'app: frontend', and a backend service 'backend-svc' exposing a Python application running in pods labeled 'app: backend'. The frontend pods need to communicate with the backend pods through a service. Design a Kubernetes network setup that allows the frontend pods to access the backend service, ensuring that the backend service is reachable only by the frontend service and not directly from outside the cluster.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Service for the Backend:
- Define a Service for the backend pods:

- This Service creates a ClusterlP service, accessible only within the cluster. The 'targetPort' specifies the port exposed by the backend pods. 2. Create a Service for the Frontend: - Define a Service for the frontend pods:

- This Service creates a LoadBalancer service, accessible from outside the cluster. 3. Configure NetworkPolicy for the Frontend Service: - Define a NetworkPolicy that allows traffic from the 'frontend-svc' to the 'backend-svc':

- This NetworkPolicy allows ingress traffic from the 'frontend-svc' and egress traffic to the 'backend-svc'. 4. Apply the Configurations: - Apply the YAML files using 'kubectl apply -f backend-svc.yaml' , 'kubectl apply -f frontend-svc.yamr , and kubectl apply -f frontend-to-backend.yamr. 5. Verification: - Check the status of the services: 'kubectl get services' - Check the network policy status: 'kubectl get networkpolicies' Now, the frontend pods can communicate with the backend service through the 'backend-svc' service. External clients can access the frontend application through the 'frontend-svc' service. The backend service is not accessible directly from outside the cluster due to the NetworkPolicy restricting traffic from external sources. ]


NEW QUESTION # 84
......

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