[Oct 10, 2025] Linux Foundation Dumps - Learn How To Deal With The (CKAD) Exam Anxiety
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Linux Foundation CKAD (Linux Foundation Certified Kubernetes Application Developer) Certification Exam is a highly sought-after certification for professionals who want to demonstrate their expertise in designing and deploying applications on Kubernetes. Kubernetes is an open-source platform that automates the deployment, scaling, and management of containerized applications. The CKAD certification is designed to validate the candidate's skills in Kubernetes application development and deployment.
What is the cost of CNCF Certified Kubernetes Application Developer
- Cost: $300 USD
- Passing score: 70%
- Number of Questions: 40
- Format: Multiple choices, multiple answers
- Length of Examination: 120 minutes
NEW QUESTION # 112
Exhibit:
Context
A project that you are working on has a requirement for persistent data to be available.
Task
To facilitate this, perform the following tasks:
* Create a file on node sk8s-node-0 at /opt/KDSP00101/data/index.html with the content Acct=Finance
* Create a PersistentVolume named task-pv-volume using hostPath and allocate 1Gi to it, specifying that the volume is at /opt/KDSP00101/data on the cluster's node. The configuration should specify the access mode of ReadWriteOnce . It should define the StorageClass name exam for the PersistentVolume , which will be used to bind PersistentVolumeClaim requests to this PersistenetVolume.
* Create a PefsissentVolumeClaim named task-pv-claim that requests a volume of at least 100Mi and specifies an access mode of ReadWriteOnce
* Create a pod that uses the PersistentVolmeClaim as a volume with a label app: my-storage-app mounting the resulting volume to a mountPath /usr/share/nginx/html inside the pod
- A. Solution:
- B. Solution:
Answer: A
NEW QUESTION # 113
Refer to Exhibit.
Task:
1) First update the Deployment cka00017-deployment in the ckad00017 namespace:
*To run 2 replicas of the pod
*Add the following label on the pod:
Role userUI
2) Next, Create a NodePort Service named cherry in the ckad00017 nmespace exposing the ckad00017-deployment Deployment on TCP port 8888
Answer:
Explanation:
Solution:
NEW QUESTION # 114
You have a custom resource definition (CRD) named that represents a database resource in your Kubernetes cluster. You want to create a custom operator that automates the creation and management of these database instances. The operator should handle the following:
- Creation: When a new 'database.example.com' resource is created, the operator should provision a new PostgreSQL database instance on the cluster-
- Deletion: When a 'database.example_com' resource is deleted, the operator should clean up the corresponding PostgreSQL database instance.
- Scaling: If the 'spec-replicas' field of the 'database-example.com' resource is updated, the operator should scale the number of database instances accordingly.
Provide the necessary Kubernetes resources, custom operator code, and steps to implement this operator. You should use the 'Operator Framework' to build and deploy this operator
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create the CRD:
- Apply this YAML file to your cluster using ' kubectl apply -f database-crd.yamr. 2. Create the Operator Project: - IJse the Operator Framework' to initialize a new operator project bash operator-sdk init -domain example.com -repo example.com/database-operator --version VO.O. I -license apache2 - Replace 'example_com' with your desired domain name. 3. Define the Custom Resource: - Create a 'database_types.go' file in the 'api/vl' directory of your project. - Define the 'Database' resource as a custom resource struct Go package v1 import ( metavl "k8s.iofapimachinery/pkg/apis/meta/v1" // DatabaseSpec defines the desired state of Database type DatabaseSpec struct { If Replicas specifies the number of database instances to run.
// Password is the password for the database users.
} // DatabaseStatus defines the observed state of Database type DatabaseStatus struct { // Replicas is the actual number of database instances running.
// Ready indicates if the database is ready to accept connections.
}
4. Implement the Controller Logic: - Create a 'database_controller.go' file in the 'controllers' directory- - Implement the logic for creating, deleting, and scaling database instances.
5. Build and Deploy the Operator: - Build the operator using the 'operator-sdk build' command: bash operator-sdk build example.com/database-operator:vO.O.I --local - Deploy the operator to your Kubernetes cluster: bash kubectl apply -f deploy/operator.yaml 6. Test the Operator: - Create a new 'database-example-com' resource:
- Apply the YAML file to your cluster: bash kubectl apply -f my-database.yaml - Verify that the operator creates a PostgreSQL database instance. - Test scaling the database by updating the 'spec.replicas' field of the 'database.example.com' resource. - Delete the 'database.example.com' resource and verify that the operator cleans up the database instance. This step-by-step guide demonstrates a basic example of a custom operator using the Operator Framework. You can Kustomize this operator further to handle more complex operations and integrate with other Kubernetes resources. ,
NEW QUESTION # 115
Context
Task
A Deployment named backend-deployment in namespace staging runs a web application on port 8081.
Answer:
Explanation:
Solution:
NEW QUESTION # 116
You are managing a Kubernetes cluster running a highly-available application that uses a custom resource called 'Orders. The 'orders resource is created and managed by a custom controller that ensures the order processing workflow runs flawlessly. However, the 'order' resource's validation rules have changed, requiring a new schema to be applied. How can you ensure that the existing 'Order' resources conform to the new schema without disrupting the application's functionality?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Define the New Schema:
- Create a new CustomResourceDefinition (CRD) file with the updated schema for the 'Order' resource.
- Ensure that the CRD's 'spec-validation.openAPlV3Schema' field includes all the new validation rules.
2. Update the CRD: - Apply the new CRD definition using 'kubectl apply -f order-crd.yaml'. 3. Create a Webhook for Validation: - Define a webhook in your Kubernetes cluster that will be responsible for validating the 'order' resources against the new schema. - Configure the webhook to be invoked during resource creation and update operations.
4. Deploy the Validation Service: - Create a deployment for the validation service that implements the logic for validating the 'Order' resources against the new schema. - The service should expose an endpoint that the webhook can communicate with.
5. Reconcile Existing Resources: - Once the validation webhook and service are deployed, create a temporary job that iterates through all existing 'Order resources. - The job snould validate each resource against tne new schema and automatically update any resources that do not comply.
By following these steps, you can ensure that your 'order' resources conform to the new schema without disrupting the application's functionality The validation webhook prevents new invalid resources from being created, and the reconciliation job ensures that existing resources are updated to meet the new schema requirements. This approach allows for smooth schema evolution and maintains the consistency of your data.,
NEW QUESTION # 117
You are creating a Deployment for a web application that uses a database for its data persistence. You want to scale the deployment horizontally, but you also want to ensure that each pod has access to the same database instance. Explain how you can use a ConfigMap to provide database connection details to each pod.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a ConfigMap:
- Create a ConfigMap that contains the necessary database connection details.
- This includes parameters like host, port, username, password, and database name.
- Example:
2. Mount the ConfigMap: - In your Deployment's 'spec-template-spec-containers' , mount the ConfigMap as a volume. - Example:
3. Access ConfigMap Values: - Within your application's code, use environment variables to access the values from the mounted ConfigMap. - For example, the environment variable 'DB HOST' would be set to the value "database-service" from the ConfigMap. 4. Deploy and Test: - Apply the ConfigMap and Deployment YAML files. - Test the application to confirm that each pod can connect to the same database using the connection details provided by the ConfigMap. 5. Scale the Deployment: - Scale the Deployment horizontally to increase the number of replicas. - Each new pod will automatically inherit the mounted ConfigMap and have access to the same database connection details.
NEW QUESTION # 118
You have a web application that requires a specific sidecar container to perform certain tasks like logging and monitoring. You need to ensure that this sidecar container iS always running alongside your application pod, even it the main application pod restarts or iS deleted and recreated. How would you achieve this using a DaemonSet in Kubernetes?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Define the DaemonSet YAML: Create a YAML file that defines the DaemonSet configuration. This file will include the following key sections:
- Metadata Includes the name and labels for the DaemonSet.
- Spec: Defines the deployment details:
- Selector: Matches the labels of the pods that the DaemonSet should manage.
- Template: Contains the pod definition:
- Containers: Defines the main application container and the sidecar container.
- Ensure the sidecar container has appropriate resources and environment variables.
- Include any necessary ports or volume mounts for the sidecar container.
- UpdateStrategy: You might want to control the update strategy (RollingUpdate or Recreate) if you have multiple nodes.
2. Create the Daemonset Apply the Daemonset YAML file to your Kubernetes cluster using 'kubectl apply -f daemonset.yamr. This will create the DaemonSet and stan deploying tne pods on each node. 3. Verify Deployment: Use 'kubectl get daemonsetS to check the status of the DaemonSet. Verify that the pods are running on each node. 4. Testing and Monitoring: - Restart or Delete the Main App Pod: Observe how the sidecar container continues running alongside the main app pod, even when the main pod is restarted or deleted and recreated. - Check Logs If your sidecar container is responsible for logging, use 'kubectl logs to check the logs from the sidecar container This approach ensures that the sidecar container remains in a ready state on each node and is always available to support your application pod, fulfilling the requirements for logging and monitoring even when the main pod restarts or is recreated.
NEW QUESTION # 119
You have a Deployment named 'wordpress-deployment' that runs 3 replicas of a Wordpress container. You need to set up resource requests and limits for CPU and memory for each pod. The application requires a minimum of 250m CPU and 512Mi memory, but it should not exceed 500m CPU and IGi memory. Furthermore, implement a resource quota for the swordpress' namespace to ensure that the total CPU requests and limits do not exceed 2 CPIJ and 4Gi memory, respectively.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Update the Deployment YAML:
- Add 'resources' to the 'containers' section, setting 'requests' and 'limits' for both CPIJ and memory.
- The 'requests' should be set to the minimum required resources, and 'limits' to the maximum allowed.
2. Create the Deployment: - Apply the updated YAML file using 'kubectl apply -f wordpress-deployment-yamr 3. Create a Resource Quota: - Create a ResourceQuota YAML file named 'wordpress-quota.yaml' with the following contents:
4. Apply the Resource Quota: - Apply the ResourceQuota YAML file using 'kubectl apply -f wordpress-quota.yamr. 5. Verify the Deployment and Quota: - Check the status of the Deployment using 'kubectl get deployments wordpress-deployment' to confirm the updated resource requests and limits. - Use ' kubectl get resourcequotas -n wordpresS to verify the applied resource quota and its remaining limits- 6. Test Resource Limits: - Try to create a new Deployment or Pod in the 'wordpress' namespace that exceeds the resource quota limits. This should result in an error, ensuring the quota is enforced.
NEW QUESTION # 120
You are building a microservice called 'order-service' that handles order processing. You need to configure a Securitycontext for the 'order-service' container tnat ensures it can access the network to communicate With other services and access specific hostPath volumes, but it should not have root privileges.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the Securitycontext:
- Create a 'securityContext' section within the 'spec.template.spec.containers' block for your 'order-service' container.
- Set 'runAslJser' to a non-root IJID (e.g., 1001) to prevent running as the root user-
- Set 'allowPrivilegeEscalation' to 'false' to prevent the container from escalating its privileges.
- Set 'capabilities' to an empty array (so') to disable any additional capabilities.
2. Mount HostPath Volumes: - Define 'volumeMountS for the required hostPath volumes. - Specify the mount path within the container C Idata' and 'Iconfig' in this example) and the volume name. - Define corresponding 'volumes with the 'hostPath' type, specifying the source path on the host and the volume name. 3. Create the Deployment: - Apply the Deployment YAML file using 'kubectl apply -f order-service-deployment-yaml' - The 'securitycontext' restricts the container's access to the host system's resources and prevents privilege escalation. - Setting 'runAsUserS to a non-root I-IID ensures that tne container runs as a non-root user - 'allowPriviIegeEscalation' prevents the container from elevating its privileges, even if it has the necessary capabilities. - The 'capabilities' section allows you to explicitly detine WhiCh capabilities the container snould nave. In this case, an empty array disables all additional capabilities, restricting the container's potential actions. - The 'volumeMounts' define how hostPath volumes are mounted within the container, providing access to specific directories on the host system. This configuration ensures that the 'order-service' container can access specific hostPath volumes and the network for communication with other services without running as root and without any additional capabilities, enhancing security.
NEW QUESTION # 121
Exhibit:
Context
A web application requires a specific version of redis to be used as a cache.
Task
Create a pod with the following characteristics, and leave it running when complete:
* The pod must run in the web namespace.
The namespace has already been created
* The name of the pod should be cache
* Use the Ifccncf/redis image with the 3.2 tag
* Expose port 6379
- A. Solution:
- B. Solution:
Answer: B
NEW QUESTION # 122
Context
Task:
1- Update the Propertunel scaling configuration of the Deployment web1 in the ckad00015 namespace setting maxSurge to 2 and maxUnavailable to 59
2- Update the web1 Deployment to use version tag 1.13.7 for the Ifconf/nginx container image.
3- Perform a rollback of the web1 Deployment to its previous version
Answer:
Explanation:
Solution:
NEW QUESTION # 123
You have a Deployment named 'mysql-deployment running a MySQL database container. The 'mysql-deployment' has 2 replicas and you want to implement a blue-green deployment strategy for updating the database. The following steps need to be implemented:
- Create a new Deployment called 'mysql-deployment-new' with the updated MySQL image.
- Ensure that both deployments (old and new) are running concurrently.
- Route traffic to the 'mysql-deployment-new' deployment.
- Remove the old deployment ('mysql-deployment) once the traffic is switched over.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a new Deployment with updated image:
- Create a new Deployment named 'mysql-deployment-new' with the updated MySQL image. You can either create a new YAML tile or use 'kubectl create deployment' command.
- Ensure that the new deployment has the same number ot replicas as the old deployment.
2. Apply the new Deployment: - Apply the new Deployment YAML using 'kubectl apply -f mysql-deployment-new.yamr 3. Check Deployment status: - IJse ' kubectl get deployments' to verity that both deployments are running. You should see both 'mysql-deployment' and 'mysql-deployment-new' . 4. Update Service to use the new deployment: - Update the Service that is associated with the MySQL database to point to the new Deployment
- Apply the updated Service YAML using 'kubectl apply -f mysql-service-yamr 5. Verify traffic routing: - Test the application or services that rely on the MySQL database to ensure that the traffic is now being routed to the 'mysql-deployment-new' 6. Delete old Deployment: - Once you have verified that the traffic is successfully routed to the new Deployment, you can delete the old Deployment 'mysql-deployment' using 'kubectl delete deployment mysql-deployment'.]
NEW QUESTION # 124
You have a web application that uses two different services: 'frontend' and 'backend'. You want to restrict access to the 'backend' service from all pods except those with the label 'app: frontend'. How would you configure NetworkPolicy to achieve this?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
- Replace with your actual namespace. 2. Apply the NetworkPolicy: - Run the following command to apply the NetworkPolicy: bash kubectl apply -f backend-networkpolicy.yaml - This NetworkPolicy defines a policy for pods with the label 'app: backend'. - The 'ingress' rule allows traffic only from pods with the label 'app: frontend'. - All other pods will be blocked from accessing the 'backend' service. This ensures that only the frontend' service can communicate with the 'backend' service. ,
NEW QUESTION # 125
Exhibit:
Context
Your application's namespace requires a specific service account to be used.
Task
Update the app-a deployment in the production namespace to run as the restrictedservice service account. The service account has already been created.
- A. Solution:
- B. Solution:
Answer: A
NEW QUESTION # 126
Exhibit:
Context
As a Kubernetes application developer you will often find yourself needing to update a running application.
Task
Please complete the following:
* Update the app deployment in the kdpd00202 namespace with a maxSurge of 5% and a maxUnavailable of 2%
* Perform a rolling update of the web1 deployment, changing the Ifccncf/ngmx image version to 1.13
* Roll back the app deployment to the previous version
- A. Solution:
- B. Solution:
Answer: B
NEW QUESTION # 127
You have a stateful application that requires persistent storage. You need to create a PersistentV01umeClaim (PVC) that Will be used by a Deployment to store application dat a. The PVC should have the following specifications:
- Access Modes: ReadWriteOnce
- Storage Class: 'fast-storage
- Storage Size: IOGi
Provide the YAML code for creating this PVC.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. create the PVC YAML file:
2. Apply the PVC YAML using kubectl: bash kubectl apply -f my-pvc.yaml 3. Verify the PVC creatiom bash kubectl get pvc You should see the PVC ' my-pvc' listed with the specified access mode, storage class, and size.,
NEW QUESTION # 128
You have a Deployment named 'nginx-deployment' running 3 replicas of an Nginx container. You need to ensure that all 3 pods are using the same ConfigMap for configuration. Additionally, you need to configure the ConfigMap so that changes made to it are automatically reflected in the running pods without requiring a new Deployment update.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create the ConfigMap:
2. Apply the ConfigMap: bash kubectl apply -f nginx-config_yaml 3. Update the Deployment to use the ConfigMap:
4. Apply the updated Deployment bash kubectl apply -f nginx-deployment.yaml 5. Verify the Deployment: bash kubectl get deployments nginx-deployment You should see that the Deployment is using the 'nginx-config' ConfigMap for its configuration. 6. Test the automatic update: - Modify the 'nginx-config' ConfigMap: bash kubectl edit configmap nginx-config Change the 'nginx_conf' value in the ConfigMap. - Verify the change in the pods: bash kubectl exec -it -- bash -c 'cat /etc/nginxfconf-d/nginx_conf' Replace with the name of one of the pods- This command will display the contents of the nginx configuration file within the pod. You will observe that the nginx configuration file in the running pods is automatically updated without needing a Deployment update.
NEW QUESTION # 129
......
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