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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Workloads & Scheduling | 15% | - Pod scheduling: node selector, affinity, taints/tolerations - Deployments, rolling updates and rollbacks - Resource requests, limits and autoscaling - Pod lifecycle, init containers, probes - Configure applications with ConfigMaps and Secrets |
| Topic 2: Cluster Architecture, Installation & Configuration | 25% | - Manage cluster lifecycle and upgrades - Manage RBAC - Create and manage clusters with kubeadm - Understand CNI, CSI, CRI interfaces - Work with CRDs and Operators - Prepare infrastructure for cluster installation - Install components via Helm / Kustomize - Implement high availability control plane |
| Topic 3: Services & Networking | 20% | - Network policies - CoreDNS and service discovery - Ingress resources and controllers - CNI configuration and troubleshooting - Service types: ClusterIP, NodePort, LoadBalancer, ExternalName |
| Topic 4: Storage | 10% | - StatefulSet storage configuration - Volume types and access modes - Persistent Volumes (PV) and Persistent Volume Claims (PVC) - StorageClasses and dynamic provisioning |
| Topic 5: Troubleshooting | 30% | - Network connectivity and DNS resolution problems - Worker node issues and recovery - Control plane component failures - Log collection and analysis - Pod and application failures - Cluster component health checks |
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NEW QUESTION # 15
Create a Kubernetes secret as follows:
* Name: super-secret
* password: bob
Create a pod named pod-secrets-via-file, using the redis Image, which mounts a secret named super-secret at
/secrets.
Create a second pod named pod-secrets-via-env, using the redis Image, which exports password as CONFIDENTIAL.
Answer:
Explanation:
NEW QUESTION # 16
Your Kubernetes cluster is experiencing performance issues, and you suspect that the kubelet process is consuming excessive resources. You need to investigate the kubelet's resource usage and adjust its configuration to improve performance.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Monitor Kubelet Resource Usage:
- Use 'kubectl top node to view the resource usage of the kubelet process on each node:
- Look for signs of high CPU or memory usage by the kubelet process.
2. Examine Kubelet Logs:
- Check the kubelet logs for any errors or warnings related to resource constraints:
- The logs can be accessed using 'journalctl -u kubelet -n
- Search for messages that suggest the kubelet is struggling to manage resources.
3. Analyze Kubelet Configuration:
- Review the kubelet's configuration file:
- The configuration file is typically located at '/etc/kubernetes/kubelet/config' on the nodes.
- Check the following settings:
- '--max-pods': The maximum number of pods that the kubelet can manage.
- '--fail-swap-on': Determines if kubelet should fail nodes that have swap enabled.
- '--cgroup-root': Specifies the cgroup root used by kubelet.
- '--cadvisor-port': Specifies the port that the kubelet's cadvisor API listens on.
- '--event-burst': Specifies the maximum number of events that can be buffered before they are sent to the API server.
- '--event-qps': Specifies the maximum number of events that can be sent to the API server per second.
4. Adjust Kubelet Configuration:
- Based on the analysis of the kubelet logs and configuration, consider these adjustments:
- Increase resource limits for kubelet: Allocate more CPU and memory to the kubelet process if necessary.
- Reduce the '-max-pods' value: Limit the number of pods managed by the kubelet to reduce its resource consumption.
- Disable swap: If the kubelet is failing nodes due to swap, disable swap.
5. Restart Kubelet:
- After making configuration changes, restart the kubelet service on the affected nodes:
- For example, use 'systemctl restart kubelet' or 'sudo systemctl restart kubelet' on most Linux distributions.
6. Monitor Performance:
- Observe the cluster's performance after adjusting the kubelet configuration:
- Use tools like 'kubectl top node' or 'kubectl top pod' to monitor resource usage.
- Check for any improvements in the cluster's overall performance and stability.
7. Further Optimization:
- If the issue persists, you might need to:
- Upgrade the Kubernetes version: Older versions of Kubernetes might have known performance issues that are addressed in newer versions.
- Analyze node hardware: Ensure that the nodes have sufficient resources to handle the workload.
- Consider using a different Kubernetes distribution: Different distributions of Kubernetes might have different performance characteristics.
- Enable Vertical Pod Autoscaling (VPA): VPA can automatically adjust the resource requests and limits of pods based on their resource usage, which can improve resource utilization.
NEW QUESTION # 17
An Administrator is configuring Authentication Enforcement and they would like to create an exemption rule to exempt a specific group from authentication. Which authentication enforcement object should they select?
Answer: A
NEW QUESTION # 18
Create a pod as follows:
Name: mongo
Using Image: mongo
In a new Kubernetes namespace named: my-website
Answer:
Explanation:
See the solution below.
Explanation
solution
F:\Work\Data Entry Work\Data Entry\20200827\CKA\9 B.JPG
NEW QUESTION # 19
You have an application deployed in your Kubernetes cluster that is configured to access a private database hosted on another Kubernetes cluster in a different VPC. How would you configure a secure and efficient way for your application to communicate with the private database?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1 . Create a Service Account in the Database Cluster:
- Create a Service Account in the database cluster that will be used by the application in the other cluster.
- Example:
- Apply this configuration using 'kubectl apply -f service-account.yaml' in the database cluster. 2. Generate a Secret for the Service Account: - Generate a secret for the Service Account. This secret will contain the credentials needed to access the database. - Example: bash kubectl create secret generic database-client-secret --from-literal=username= -n - Replace and with your actual credentials and " with the namespace where your database service is running. 3. Configure a Network Policy: - Create a Network Policy in the database cluster to allow traffic from your application's pods in the other cluster. - Example:
- Replace with the label assigned to your application pods. 4. Create a Service in the Database Cluster: - Create a Service in the database cluster that exposes your database. This service will be used by your application to connect to the database. - Example:
- Replace 'database' with the label of your database pods. 6. Configure the Application Deployment: - In your application's deployment configuration, mount the secret containing the database credentials and configure your application to connect to the database service in the other cluster using the service's DNS name. - Example:
- Ensure that the application has the necessary network connectivity to access the database cluster through your network configuration. - Example: - Configure a VPC peering connection between the two VPCs to enable direct communication between the clusters. - Create a VPN connection between the clusters using a VPN gateway. 7. Test the Connection: - Verify that your application can successfully connect to and interact with the database.
NEW QUESTION # 20
......
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