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Linux Foundation Certified Kubernetes Application Developer Exam Sample Questions (Q121-Q126):

NEW QUESTION # 121
You are tasked with creating a highly available, scalable, and stateful application that handles user profiles and associated dat a. The application must be able to handle high write and read traffic and ensure data consistency. Which Kubernetes resource is best suited tor this scenario and why? Additionally, provide a code snippet illustrating the deployment of this resource with three replicas, each storing user data in a persistent volume.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Identify the Suitable Resource:
- The best Kubernetes resource for this scenario is a StatefulSet.
- StatefulSets provide unique network identities and persistent storage for each pod, making them ideal for stateful applications. They ensure ordered deployments and rollbacks, guaranteeing that pods are always launched in a specific order and with consistent data
2. Code Snippet

- StatefulSet Definition: Defines the StatefulSet With the name "user-profile-app", sets the replica count to 3, and defines a selector that matches pods with the label "app: user-profile-app". - Service Definition: Sets up a service named "user-profile-service" that exposes the application on port 8080. - Template: Defines tne pod template for each replica. - Container: Specifies the container image, port mapping, and volume mounting for the user datm - Volume Mounts: Mounts the persistent volume claim "user-data" to the ' Idata' directory inside the container. - Volumes: Defines tne persistent volume claim "user-data" which is linked to a PersistentVolumeClaim named "user-data-pvc." - PersistentVolumeClaim: Defines a PersistentVolumeClaim named "user-data-pvc" to request a persistent volume with 1 Gi storage- 4. Deployment Steps: - Create the PersistentVolumeClaim (PVC) using kubectl apply -f user-profile-app.yamr - Create the StatefulSet using 'kuactl apply -f user-profile-app.yaml' - Access the application through the service name "user-profile-service" This setup creates a highly available and scalable application that ensures data persistence and consistency across three replicas. ]

NEW QUESTION # 122
You have a Deployment for a stateless application that involves several containers. You want to expose this application as a single service using a Service resource- You also want to configure the Service to use a specific label selector to target the correct pods and to ensure that the Service uses a round-robin load balancing strategy for distributing traffic across the pods. Explain how you can create the Service resource and configure it to acnjeve this.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Service:
- Create a Service resource that defines how the pods of your application will be accessed externallv
- Specify a unique name for the Service and define the port mapping-
- Example:

2. Set Selector: - Use the 'selector field to specify the label that the Service should use to identify the pods it should target - Ensure that the pods of your Deployment are labeled with the specified 'app: myapp' label. 3. Configure Load Balancing: - The default load balancing strategy for Kubernetes Services is round-robin, which distributes traffic evenly across the available pods. - No additional configuration is needed for this strategyc 4. Deploy and Test: - Apply the Service YAML file. - Test the Service by accessing it from outside the cluster. - Ensure that the traffic is distributed evenly across the pods using the round-robin strategy. 5. Optional: External Access: - If you want to expose the Service to the internet, you can set the Service 'type' to 'Load8alancer'. This will create a LoadBalancer resource (often an external IP address) that routes traffic to the Service.

NEW QUESTION # 123
You have a Deployment running with a specific image tag, and you want to roll out a new version with a different image tag- However, you want to ensure that the update process is gradual, and only one pod is updated at a time. Additional'" you need to monitor the performance metrics of the application during the update, and if the performance degrades significantly, you need to rollback to the previous version How would you implement this using Kustomize and other Kubernetes features?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a customization file:
resources :
- deployment. yaml
2. Create a deployment-yaml file:

3. Configure a rolling update strategy: - Edit the 'deployment.yamr file and add the following to the 'spec-strategy' section:

4. Set up monitoring with Prometheus and Grafana: - Install Prometheus and Grafana on your Kubernetes cluster. - Configure Prometheus to scrape metrics from your application pods. - Create Grafana dashboards to visualize the relevant metrics. 5. Create an alert in Prometheus: - Define an alert that triggers if the application's performance degrades significantly - This alert should be configured to send notifications to your team. 6. Create a rollback mechanism: - IJse a script or a tool like 'oubect1 rollout undo' to rollback the deployment to the previous version if the performance alert is triggered. 7. Update the deployment with the new image tag: - Edit the 'deployment-yamp file and change the 'image' to 'example/nginx:v2 8. Apply the changes to your Kubernetes cluster: bash oubect1 apply -f deployment-yaml - The 'maxSurge' and 'maxunavailable' settings in the 'rollinglJpdate' strategy control the maximum number of pods that can be added or removed during the update process. - Prometheus and Grafana provide a way to monitor the performance metrics of your application. - The Prometheus alert helps you identify if the performance degrades significantly during the update process. - The rollback mechanism allows you to revert to the previous version if the performance alert is triggered. - This setup ensures a gradual update process and provides a mechanism to mitigate potential performance issues. ,

NEW QUESTION # 124
Refer to Exhibit.

Set Configuration Context:
[student@node-1] $ | kubectl
Config use-context k8s
Context
A pod is running on the cluster but it is not responding.
Task
The desired behavior is to have Kubemetes restart the pod when an endpoint returns an HTTP 500 on the /healthz endpoint. The service, probe-pod, should never send traffic to the pod while it is failing. Please complete the following:
* The application has an endpoint, /started, that will indicate if it can accept traffic by returning an HTTP 200. If the endpoint returns an HTTP 500, the application has not yet finished initialization.
* The application has another endpoint /healthz that will indicate if the application is still working as expected by returning an HTTP 200. If the endpoint returns an HTTP 500 the application is no longer responsive.
* Configure the probe-pod pod provided to use these endpoints
* The probes should use port 8080

Answer:

Explanation:
Solution:
To have Kubernetes automatically restart a pod when an endpoint returns an HTTP 500 on the /healthz endpoint, you will need to configure liveness and readiness probes on the pod.
First, you will need to create a livenessProbe and a readinessProbe in the pod's definition yaml file. The livenessProbe will check the /healthz endpoint, and if it returns an HTTP 500, the pod will be restarted. The readinessProbe will check the /started endpoint, and if it returns an HTTP 500, the pod will not receive traffic.
Here's an example of how you can configure the liveness and readiness probes in the pod definition yaml file:
apiVersion: v1
kind: Pod
metadata:
name: probe-pod
spec:
containers:
- name: probe-pod
image: <image-name>
ports:
- containerPort: 8080
livenessProbe:
httpGet:
path: /healthz
port: 8080
initialDelaySeconds: 15
periodSeconds: 10
failureThreshold: 3
readinessProbe:
httpGet:
path: /started
port: 8080
initialDelaySeconds: 15
periodSeconds: 10
failureThreshold: 3
The httpGet specifies the endpoint to check and the port to use. The initialDelaySeconds is the amount of time the pod will wait before starting the probe. periodSeconds is the amount of time between each probe check, and the failureThreshold is the number of failed probes before the pod is considered unresponsive.
You can use kubectl to create the pod by running the following command:
kubectl apply -f <filename>.yaml
Once the pod is created, Kubernetes will start monitoring it using the configured liveness and readiness probes. If the /healthz endpoint returns an HTTP 500, the pod will be restarted. If the /started endpoint returns an HTTP 500, the pod will not receive traffic.
Please note that if the failure threshold is set to 3, it means that if the probe fails 3 times consecutively it will be considered as a failure.
The above configuration assumes that the application is running on port 8080 and the endpoints are available on the same port.

NEW QUESTION # 125
You are running a web application with multiple services exposed via Kubernetes Ingress. The application has two distinct environments: 'staging' and 'production' , each with its own set of services and domain names. You need to configure Ingress rules to route traffic to the appropriate services based on the requested hostname and environment. For example, requests to 'staging.example.com' should be directed to the staging environment, while requests to 'example.com' should go to the production environment. Implement this configuration using Ingress rules.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Service for Each Environment:
- Define services for both 'staging' and 'production' environments, ensuring that the services for each environment are named appropriately. For example, 'staging-service' and .

2. Create an Ingress Resource: - Define an Ingress resource that maps the hostnames to the corresponding services.

3. Apply the Configuration: - Apply the service and ingress definitions using 'kubectl apply -f services.yaml' and 'kubectl apply -f ingress.yaml' respectively. 4. Test the Configuration: - Access 'staging.example.com' and 'example.com' in your browser to ensure that the traffic is directed to the correct services and environments. ,

NEW QUESTION # 126
......

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LINUX FOUNDATION REALISTIC LATEST CKAD EXAM CRAM - LINUX FOUNDATION CERTIFIED KUBERNETES APPLICATION DEVELOPER EXAM EXAMCOLLECTION DUMPS 100% PASS QUIZ

Linux Foundation Realistic Latest CKAD Exam Cram - Linux Foundation Certified Kubernetes Application Developer Exam Examcollection Dumps 100% Pass Quiz