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The CKA exam is a hands-on, practical test that requires candidates to perform tasks on a live Kubernetes cluster. CKA exam is conducted online and comprises of 24 performance-based tasks that must be completed within 3 hours. To pass the exam, candidates must score 74% or higher. The CKA Certification is valid for three years, after which candidates can renew their certification by passing a recertification exam. The CKA program provides a proven path to career advancement and recognition as a Kubernetes expert.
NEW QUESTION # 20
You have a 'NodePort' service named 'my-service' exposed on port 30000. You need to configure a NetworkPolicy to only allow access to the service from specific nodes in the cluster based on their node labels.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a NetworkPolicy:
- Define a NetworkPolicy that allows traffic from nodes with specific labels to the service.
2. Apply the NetworkPolicy: - Apply the YAML file using 'kubectl apply -f networkpolicy.yaml'. 3. Verify the NetworkPolicy: - Check the status of the NetworkPolicy using 'kubectl get networkpolicies allow-specific-nodes -n . 4. Test: - Access the service using the 'NodePort' on a node with the specified label. You should be able to access the service. - Access the service using the 'NodePort' on a node that does not have the specified label. You should not be able to access the service. Note: - Replace with the actual namespace where your service is located. - Replace the CIDR values with the actual CIDRs of your nodes or the node labels that you want to use for filtering.,
NEW QUESTION # 21
Check the history of the specific revision of that deployment
Answer:
Explanation:
kubectl rollout history deploy webapp --revision=3
NEW QUESTION # 22
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 # 23
Score: 5%
Task
From the pod label name=cpu-utilizer, find pods running high CPU workloads and write the name of the pod consuming most CPU to the file /opt/KUTR00401/KUTR00401.txt (which already exists).
Answer:
Explanation:
Solution:
kubectl top -l name=cpu-user -A
echo 'pod name' >> /opt/KUT00401/KUT00401.txt
NEW QUESTION # 24
You have a Kubernetes cluster with three nodes. You need to create a Role that allows users in the "developers" group to access the "nginx-deployment" deployment in the "default" namespace. This role should only permit users to view and update the deployment, not delete it.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create the Role:
2. Create the RoleBinding:
3. Apply the Role and RoleBinding: bash kubectl apply -f role.yaml kubectl apply -f rolebinding.yaml
NEW QUESTION # 25
......
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