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Linux Foundation Certified Kubernetes Application Developer Exam Sample Questions (Q111-Q116):

NEW QUESTION # 111
Context

Given a container that writes a log file in format A and a container that converts log files from format A to format B, create a deployment that runs both containers such that the log files from the first container are converted by the second container, emitting logs in format B.
Task:
* Create a deployment named deployment-xyz in the default namespace, that:
* Includes a primary
lfccncf/busybox:1 container, named logger-dev
* includes a sidecar Ifccncf/fluentd:v0.12 container, named adapter-zen
* Mounts a shared volume /tmp/log on both containers, which does not persist when the pod is deleted
* Instructs the logger-dev
container to run the command

which should output logs to /tmp/log/input.log in plain text format, with example values:

* The adapter-zen sidecar container should read /tmp/log/input.log and output the data to /tmp/log/output.* in Fluentd JSON format. Note that no knowledge of Fluentd is required to complete this task: all you will need to achieve this is to create the ConfigMap from the spec file provided at /opt/KDMC00102/fluentd-configma p.yaml , and mount that ConfigMap to /fluentd/etc in the adapter-zen sidecar container

Answer:

Explanation:
Solution:

NEW QUESTION # 112
You have a microservice application that relies on a Redis cacne for data retrieval. Design a multi-container Pod that incorporates a Redis sidecar container to provide local caching within the Pod. Ensure that the main application container can access the Redis sidecar container within the same Pod Namespace Without needing to communicate with an external Redis cluster.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the Pod YAML: Create a Pod YAML file that includes both the main application container and the Redis sidecar container.

2. Configure Environment Variables: Set an environment variable 'REDIS HOST within the main application container to point to the Redis sidecar containers hostname- In Kubernetes, containers within the same Pod can communicate with each other using their container names. 3. Connect Application to Redis: Modifry' the application code to connect to the Redis instance using the 'REDIS HOST environment variable. For example, using a Python application with the 'redis-py' library: python import redis r = redis-Redis(host=os.environ.get('REDlS_HOST'), port=6379) # Perform Redis operations (e.g., r.set('key', 'value')) 4. Deploy the Pod: Apply the Pod YAML using 'kubectl apply -f my-app-pod.yamr 5. Verify Connectivity: Check the logs of the main application container to ensure it's successfully connecting to the Redis sidecar container Note: This approach provides local caching within the Pod, reducing external network calls and improving performance. It's important to consider potential data consistency issues if multiple Pods share the same Redis instance.

NEW QUESTION # 113
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 # 114
You are running a web application on a Kubernetes cluster, and you want to ensure that thecontainer running your application is protected from potential security vulnerabilities. You are specifically concerned about unauthorized access to the container's filesystem. Explain how you would implement AppArmor profiles to restrict access to the container's filesystem.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the AppArmor Profile:
- Create a new AppArmor profile file, for example, 'nginx-apparmor.conf, within your Kubernetes configuration directory.
- Within this file, define the restrictions for the container.
- For instance, to allow access to specific directories and files:
# include common AppArmor profile
include /etc/apparmor.d/abstractions/base/nginx.apparmor
# Allow access to specific directories
/var/www/html r,
/etc/nginx r,
# Allow access to specific files
/etc/nginx/nginx.conf r,
/usr/sbin/nginx r,
# Deny access to all other files and directories
Deny
2. Load the AppArmor Profile:
- Use the create configmap' command to create a ConfigMap containing your AppArmor profile:
Bash
kubectl create configmap nginx-apparmor-profile --from-file=nginx-apparmor.conf
3. Apply the Profile to Your Deployment:
- Update your Deployment YAML file to include the AppArmor profile:

4. Restart the Pods: - Apply the updated Deployment YAML using 'kubectl apply -f nginx-deployment.yaml' - The updated deployment will restart the pods with the new AppArmor profile. 5. Verify the Profile: - Check the status of the pods with 'kubectl describe pod - Look for the "Security Context" section and verify that the AppArmor profile is correctly applied. 6. Test the Restrictions: - Try to access files or directories that are not allowed by your AppArmor profile. - This will help you confirm that the profile is effectively restricting access.

NEW QUESTION # 115
Context

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

Answer:

Explanation:
Solution:

NEW QUESTION # 116
......

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