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Linux Foundation Certified Kubernetes Application Developer (CKAD) certification is a program that validates the skills of an individual in designing, building, configuring, and exposing cloud-native applications on Kubernetes. Kubernetes is an open-source container orchestration system that automates the deployment, scaling, and management of containerized applications.

Linux Foundation Certified Kubernetes Application Developer Exam Sample Questions (Q130-Q135):

NEW QUESTION # 130
You are building a microservice application that consists of multiple Pods. Each Pod needs to access a shared database hosted in a separate Pod. How would you create a ConfigMap to store the database connection details and make it available to all Pods in the application?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Create a ConfigMap:
- Create a ConfigMap named "database-config' to store the database connection details.
- Replace 'your-database-hostname' , 'your-database-port, 'your-database-user, and 'your-database-password' with the actual connection information.

2. Mount the ConfigMap to Pods: - In tne Deployment configurations for each microservice Pod, mount the 'database-config' ConfigMap as a volume. - Use 'envFror-n' to include the ConfigMap's data as environment variables for the application container - This way, the application can access the database connection details directly through environment variables.

3. Verify the Connection: - Once the Pods are deployed, you can check the application logs to ensure that they are successfully connecting to the database using the provided connection details.

NEW QUESTION # 131

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:

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:
See the solution below.
Explanation
Solution:
Create the Pod:
kubectl create
-f http://k8s.io/docs/tasks/configure-pod-container/
exec-liveness.yaml
Within 30 seconds, view the Pod events:
kubectl describe pod liveness-exec
The output indicates that no liveness probes have failed yet:
FirstSeen LastSeen Count From SubobjectPath Type Reason Message
--------- -------- ----- ---- ------------- -------- ------ -------
24s 24s 1 {default-scheduler } Normal Scheduled Successfully assigned liveness-exec to worker0
23s 23s 1 {kubelet worker0} spec.containers{liveness} Normal Pulling pulling image
"gcr.io/google_containers/busybox"
23s 23s 1 {kubelet worker0} spec.containers{liveness} Normal Pulled Successfully pulled image
"gcr.io/google_containers/busybox"
23s 23s 1 {kubelet worker0} spec.containers{liveness} Normal Created Created container with docker id
86849c15382e; Security:[seccomp=unconfined]
23s 23s 1 {kubelet worker0} spec.containers{liveness} Normal Started Started container with docker id
86849c15382e
After 35 seconds, view the Pod events again:
kubectl describe pod liveness-exec
At the bottom of the output, there are messages indicating that the liveness probes have failed, and the containers have been killed and recreated.
FirstSeen LastSeen Count From SubobjectPath Type Reason Message
--------- -------- ----- ---- -------------
37s 37s 1 {default-scheduler } Normal Scheduled Successfully assigned liveness-exec to worker0
36s 36s 1 {kubelet worker0} spec.containers{liveness} Normal Pulling pulling image
"gcr.io/google_containers/busybox"
36s 36s 1 {kubelet worker0} spec.containers{liveness} Normal Pulled Successfully pulled image
"gcr.io/google_containers/busybox"
36s 36s 1 {kubelet worker0} spec.containers{liveness} Normal Created Created container with docker id
86849c15382e; Security:[seccomp=unconfined]
36s 36s 1 {kubelet worker0} spec.containers{liveness} Normal Started Started container with docker id
86849c15382e
2s 2s 1 {kubelet worker0} spec.containers{liveness} Warning Unhealthy Liveness probe failed: cat: can't open
'/tmp/healthy': No such file or directory
Wait another 30 seconds, and verify that the Container has been restarted:
kubectl get pod liveness-exec
The output shows that RESTARTS has been incremented:
NAME READY STATUS RESTARTS AGE
liveness-exec 1/1 Running 1 m

NEW QUESTION # 132

Context
You are tasked to create a ConfigMap and consume the ConfigMap in a pod using a volume mount.
Task
Please complete the following:
* Create a ConfigMap named another-config containing the key/value pair: key4/value3
* start a pod named nginx-configmap containing a single container using the nginx image, and mount the key you just created into the pod under directory /also/a/path See the solution below.

Answer:

Explanation:
Explanation
Solution:

NEW QUESTION # 133
Context

Context
You are asked to prepare a Canary deployment for testing a new application release.
Task:
A Service named krill-Service in the goshark namespace points to 5 pod created by the Deployment named current-krill-deployment

1) Create an identical Deployment named canary-kill-deployment, in the same namespace.
2) Modify the Deployment so that:
-A maximum number of 10 pods run in the goshawk namespace.
-40% of the krill-service 's traffic goes to the canary-krill-deployment pod(s)

Answer:

Explanation:
Solution:

NEW QUESTION # 134
You have a Deployment named 'my-app' that runs 3 replicas of a Python application. You need to implement a bluetgreen deployment strategy where only a portion of the traffic is directed to the new version of the application initially. After successful validation, you want to gradually shift traffic to the new version until all traffic is directed to it. You'll use a new image tagged for the new version.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a new Deployment for the new version:
- Create a new Deployment file called 'my-app-v2.yaml'
- Define the 'replicas' to be the same as the original Deployment.
- Set the 'image' to 'my-app:v2'
- Ensure the 'metadata-name' is different from the original deployment.
- Use the same 'selector.matchLabelS as the original Deployment.
- Create the Deployment using 'kubectl apply -f my-app-v2.yaml'.

2. Create a Service for tne new Deployment: - Create a new Service file called 'my-app-v2-service.yaml'. - Define the 'selector' to match the labels of the 'my-app-v2 Deployment. - Set the 'type' to 'LoadBalancer' or 'NodePort' (depending on your environment) to expose the service. - Create the Service using 'kubectl apply -f my-app-v2-service.yaml"

3. Create an Ingress (or Route) for traffic routing: - Create an Ingress (or Route) file called 'my-app-ingress.yaml' - Define the 'host' to match your domain or subdomain. - Use a 'rules' section with two 'http' rules: one for the original Deployment C my-app-service' in this example) and one tor the new Deployment my- app-v2-service' in this example). - Define a 'path' for each rule to define the traffic routing. For example, you could route 'r to 'my-app-service' and ','v2 to 'my-app-v2-services - Create the Ingress (or Route) using 'kubectl apply -f my-app-ingress.yaml'

4. Test the new version: - Access the my-app.example.com/v2 endpoint to test the new version of your application. - Validate the functionality of the new version. 5. Gradually shift traffic: - You can adjust the 'path' rules in the Ingress (or Route) to gradually shift traffic to the new version. For example, you could define a 'path' like S/v2/beta' and then later change it to '/v2 - Alternatively, you can use a LoadBalancer controller like Kubernetes Ingress Controller (Nginx or Traefik) to configure traffic splitting using weights or headers. 6. Validate the transition: - Continue monitoring traffic and application health during the gradual shift. - Ensure a smooth transition to the new version without impacting users. 7. Delete the old Deployment and Service: - Once all traffic is shifted to the new version and you are confident in its performance, delete the old Deployment and Service C kubectl delete deployment my-app' and 'kubectl delete service my-app-service') to complete the blue/green deployment process. Note: This is a simplified example. In a real production environment, you would likely need to implement additional steps for: - Health checks: Ensure the new version is healthy before shifting traffic. - Rollback: Implement a rollback mechanism to quickly revert to the previous version if needed. - Configuration management: Store and manage configuration settings consistently across deployments. - Monitoring and logging: Monitor the new version for performance and health issues. ,

NEW QUESTION # 135
......

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