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Linux Foundation Certified Kubernetes Application Developer (CKAD) Exam is a certification that validates the skills and knowledge of developers working with Kubernetes applications. Kubernetes is an open-source container orchestration system that automates the deployment, scaling, and management of containerized applications. CKAD is a vendor-neutral certification that is recognized by leading technology companies around the world.

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Linux Foundation CKAD Certification Exam is an excellent certification program for developers who work with Kubernetes. Linux Foundation Certified Kubernetes Application Developer Exam certification exam is designed to test the candidate's ability to deploy, manage and troubleshoot Kubernetes applications. Linux Foundation Certified Kubernetes Application Developer Exam certification exam is an online, proctored exam that can be taken from anywhere in the world. Linux Foundation Certified Kubernetes Application Developer Exam certification is ideal for developers who are looking to advance their careers in the field of cloud-native application development and for organizations who are looking to identify qualified professionals who can help them to build and manage Kubernetes applications.

Linux Foundation Certified Kubernetes Application Developer Exam Sample Questions (Q159-Q164):

NEW QUESTION # 159
You are running a web application within a Kubernetes cluster. The application consists of two pods, each with a resource request of 1CPU core and I GiB of memory. However, you've noticed that the application experiences performance issues during peak traffic hours. To mitigate these issues, you decide to implement resource quotas tor the namespace where the application runs. You want to ensure that the application pods receive adequate resources while preventing other applications from consuming excessive resources. Design and implement a resource quota for the namespace that sets limits for CPU and memory resources.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the Resource Quota:
- Create a YAML file (e.g., resource-quota.yaml') containing the following resource quota configuration:

2. Apply the Resource Quota: - Apply the resource quota to the 'web-app' namespace using the following command: bash kubectl apply -f resource-quota-yaml 3. Verify the Resource Quota: - Check the status of the resource quota using the following command: bash kubectl get resourcequotas -n web-app You should see the 'web-app-quota' listed with its defined limits and requests. 4. Monitor Resource Usage: - Use the 'kubectl describe resourcequota web-app-quota -n web-apps command to monitor the current resource usage within the 'web-apps namespace- This will show you the consumed resources against the defined limits. 5. Adjust the Resource Quota: - If the resource quota is too restrictive or not restrictive enough, you can adjust the values in the 'requests' and 'limits' fields in the 'resource. quota.yaml file and reapply the resource quota using 'kubectl apply'. - The resource quota limits the total amount of resources (CPU and memory) that can be consumed by all pods in the 'web-app' namespace. - The requests' field specifies the total amount of resources that pods in the namespace can request. - The 'limits' field sets a hard limit on the total amount of resources that pods can use, preventing them from exceeding these limits. - This ensures that the web application has access to the required resources while preventing other applications in the namespace from consuming all available resources. ,

NEW QUESTION # 160
You nave a Deployment running a web application tnat uses secrets to store sensitive information like database credentials. To improve security, you want to use a secret injection mechanism to provide the secret to the pod without exposing it in the deployment YAML.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Secret:
- Create a secret containing the sensitive information:

2. Configure Deployment to Use Secret: - Update the Deployment YAML to mount the secret into the container:

3. Apply the Configuration: - Apply tne Secret and Deployment configuration: bash kubectl apply -f my-secret.yaml kubectl apply -f my-web-app-deployment.yaml 4. Verify Secret Injection: - Access the secret information from within the container using environment variables: - For example, '$DATABASE_USERNAME and '$DATABASE PASSWORD'.

NEW QUESTION # 161
You have a ConfigMap named 'my-app-config' that stores environment variables for your application. You want to dynamically update tne values in the ConfigMap without restarting the pods. How would you achieve this using a Kubernetes Patch?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Get the Existing ConfigMap Data:
bash
kubectl get configmap my-app-config -o yaml > my-app-config.yaml
2. Modify the YAML File:
- Open 'my-app-config.yaml and update the values in the 'data' section as required- For example, if you want to change the value of 'DATABASE_HOST to Sdb.new.example.coms:

3. Patch the ConfigMap: bash kubectl patch configmap my-app-config -p "S(cat my-app-config_yaml)" 4. Verify the Changes: bash kubectl get configmap my-app-config -o yaml 5. Observe the Updated Values: - The pods will automatically pick up the updated values without the need for restarting. - You can confirm this by checking the environment variables within the pod using 'kubectl exec -it - bash -c 'env" This method allows for dynamic updates to the ConfigMap without restarting the pods, making it a convenient way to manage environment variables in your Kubernetes applications.

NEW QUESTION # 162
Refer to Exhibit.

Set Configuration Context:
[student@node-1] $ | kubectl
Config use-context k8s
Context
A user has reported an aopticauon is unteachable due to a failing livenessProbe .
Task
Perform the following tasks:
* Find the broken pod and store its name and namespace to /opt/KDOB00401/broken.txt in the format:
<namespace>/<pod>

The output file has already been created
* Store the associated error events to a file /opt/KDOB00401/error.txt, The output file has already been created. You will need to use the -o wide output specifier with your command
* Fix the issue.

Answer:

Explanation:
To find the broken pod and store its name and namespace to /opt/KDOB00401/broken.txt, you can use the kubectl get pods command and filter the output by the status of the pod.
kubectl get pods --field-selector=status.phase=Failed -o jsonpath='{.items[*].metadata.namespace}/{.items[*].metadata.name}' > /opt/KDOB00401/broken.txt This command will list all pods with a status of Failed and output their names and namespaces in the format <namespace>/<pod>. The output is then written to the /opt/KDOB00401/broken.txt file.
To store the associated error events to a file /opt/KDOB00401/error.txt, you can use the kubectl describe command to retrieve detailed information about the pod, and the grep command to filter the output for error events.
kubectl describe pods <pod-name> --namespace <pod-namespace> | grep -i error -B5 -A5 > /opt/KDOB00401/error.txt Replace <pod-name> and <pod-namespace> with the name and namespace of the broken pod you found in the previous step.
This command will output detailed information about the pod, including error events. The grep command filters the output for lines containing "error" and also prints 5 lines before and after the match.
To fix the issue, you need to analyze the error events and find the root cause of the issue.
It could be that the application inside the pod is not running, the container image is not available, the pod has not enough resources, or the liveness probe configuration is incorrect.
Once you have identified the cause, you can take appropriate action, such as restarting the application, updating the container image, increasing the resources, or modifying the liveness probe configuration.
After fixing the issue, you can use the kubectl get pods command to check the status of the pod and ensure

NEW QUESTION # 163
Context

Task
You have rolled out a new pod to your infrastructure and now you need to allow it to communicate with the web and storage pods but nothing else. Given the running pod kdsn00201 -newpod edit it to use a network policy that will allow it to send and receive traffic only to and from the web and storage pods.

Answer:

Explanation:
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: internal-policy
namespace: default
spec:
podSelector:
matchLabels:
name: internal
policyTypes:
- Egress
- Ingress
ingress:
- {}
egress:
- to:
- podSelector:
matchLabels:
name: mysql
ports:
- protocol: TCP
port: 3306
- to:
- podSelector:
matchLabels:
name: payroll
ports:
- protocol: TCP
port: 8080
- ports:
- port: 53
protocol: UDP
- port: 53
protocol: TCP

NEW QUESTION # 164
......

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