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Linux Foundation Certified Kubernetes Application Developer Exam Sample Questions (Q80-Q85):

NEW QUESTION # 80
You have a Deployment named 'redis-deployment that runs 3 replicas of a Redis container. You need to implement a rolling update strategy that allows tor a maximum ot one pod to be unavailable at any given time during tne update process, With the new pod becoming available before the old pod is terminated. Additionally, you want to ensure that the update process is triggered automatically whenever a new image is pushed to the Docker Hub repository 'redislabs/redis:latest.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Update the Deployment YAML:
- Update the 'replicas to 2_
- Define 'maxunavailable: 1 ' and 'maxSurge: 1 ' in the 'strategy.rollingupdate' section to control the rolling update process.
- Configure a 'strategy-type' to 'Rollingupdate' to trigger a rolling update when the deployment is updated.
- Add a 'spec-template.spec.imagePullPolicy: Always' to ensure that the new image is pulled even if it exists in the pod's local cache.

2. Create the Deployment: - Apply the updated YAML file using 'kubectl apply -f redis-deployment.yaml' 3. Verify the Deployment - Check the status of the deployment using 'kubectl get deployments redis-deployment' to confirm the rollout and updated replica count. 4. Trigger the Automatic Update. - Push a new image to the Docker Hub repository 5. Monitor the Deployment: - Use 'kubectl get pods -l app=rediS to monitor the pod updates during the rolling update process. You will observe that one new pod with the updated image is created, and then one old pod is terminated- This ensures that there is no downtime during the update process. 6. Check for Successful Update: - Once the deployment is complete, use 'kubectl describe deployment redis-deployment' to see that the 'updatedReplicaS field matches the 'replicas' field, indicating a successful update.

NEW QUESTION # 81
You have a Deployment named 'my-app-deployment' running an application that requires a specific version of a database. This version is available in a private Docker registry with access credentials stored in a Secret. How would you configure the Deployment to pull the database image from the private registry using the Secret's credentials?

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 usemame and password required to access the private registry.
- Replace 'your-registry-username' and 'your-registry-password' with your actual credentials.

2. Update the Deployment - Modify the Deployment configuration to include the 'imagePullSecrets' field. - Add the name oftne secret you created in the previous step. - Replace 'your-private-registry-domain/your-database-image:your-version' with the actual image name and version.

3. Apply the Changes: - Apply the updated Deployment configuration using 'kubectl apply -f my-app-deployment.yamr. 4. Verify the Pull: - Check the logs of the Pods in the Deployment. You should see messages indicating that the database image is pulled from the private registry using the provided credentials.

NEW QUESTION # 82

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

Answer:

Explanation:
See the solution below.
Explanation
Solution:

NEW QUESTION # 83
You are building a microservice that requires a specific configuration file to be mounted into the container This configuration file should be updated witnout restarting tne microservice container. How can you achieve this using Kubernetes?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. use ConfigMaps:
- Create a 'ConfigMap' to store the configuration file.
- Create a YAML file (e.g., 'config.yamIS) with your configuration content:

2. Mount the ConfigMap: - In your 'Deployment definition, mount the 'configMap' into the container using a volume mount

3. Update the Configuration: - IJpdate the 'ConfigMap' directly using ' kubectl patch configmap my-microservice-config -type-merge -p '{"data": {"config-json"' "updated - The changes will be reflected in the mounted volume inside the container. 4. Access the Configuration: - Your microservice code should read the configuration file from the mounted path (e.g., '/etc/config')- Note: This approach avoids restarting the container when you need to update the configuration. The 'ConfigMaps acts as a persistent volume, and changes to its content are automatically reflected in the mounted volume inside the container

NEW QUESTION # 84
You are running a multi-container application on Kubernetes, and you need to update the image of a specific container within the pod without affecting the other containers. You are using a Deployment resource to manage the pods. How can you achieve this update using imperative commands?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Identify the Pod:
- Use 'kubectl get pods -l to list the pods managed by your deployment. Replace
- Identify the pod that needs the container image update.
2. Identify the Container:
- Use ' kubectl describe pod to display the pod's details, including its containers.
- Note the name of the container you want to update.
3. Update the Container Image:
with the label you've defined for your deployment.
- Use 'kubectl exec -it -container bash' to create an interactive shell within the specified container.
- Inside the shell, update the image for the container using 'docker pull ' (Replace with the new container image you want to use).
- Exit the shell using 'exit
4. Restart the Container:
- Use 'kubectl exec -it -container bash' to access the container again.
- Run 'docker restan to restart the container with the new image.
- Exit the shell using 'exit'.
5. Verify the Image Update:
- Run 'kubectl describe pod to check the updated pod details. Verify that the container image iS now the new one you pulled.
Note: This approach updates the container image in the existing pod. If you want to apply the update to all pods managed by the Deployment, you'll need to update the Deployment configuration itself. ,

NEW QUESTION # 85
......

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