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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Services and Networking | 20% | - Expose applications via Services - Use Ingress rules - Troubleshoot network access - Understand and apply NetworkPolicies |
| Topic 2: Application Observability and Maintenance | 15% | - Monitor applications using CLI tools - Understand API deprecations - Work with container logs - Debug applications in Kubernetes - Implement probes and health checks |
| Topic 3: Application Deployment | 20% | - Manage Deployments, rolling updates and rollbacks - Work with Kustomize - Implement deployment strategies - Use Helm package manager |
| Topic 4: Application Design and Build | 20% | - Define, build and modify container images - Understand multi-container Pod design patterns - Utilize persistent and ephemeral volumes - Choose and use appropriate workload resources |
| Topic 5: Application Environment, Configuration and Security | 25% | - Understand authentication, authorization and admission control - Configure resource requirements, limits and quotas - Use ServiceAccounts - Apply application security settings - Create and consume Secrets - Use custom resources and extensions - Work with ConfigMaps |
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NEW QUESTION # 79 
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:
See the solution below.
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 # 80
You are tasked With setting up a Kubernetes cluster With a service that exposes a web application, along with a database running as a stateful set The application needs to access the database through an internal IP address, but the database should not be accessible from outside the cluster. What are the steps involved to configure this, and what components should be used to achieve this setup?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Create the Database StatefuISet:
- Define a StatefulSet for your database, ensuring it uses a persistent volume to store its data.
- Specify the database image and any necessary configuration.
- Configure a service of type 'ClusterlP' for the database, accessible only within the cluster
2. Create the Application Deployment: - Create a Deployment for your web application, specifying the application image and required ports. - Add an environment variable to the application container to define tne database connection string, using the database service's ClusterlP.
3. Create the Application Service: - Create a service of type 'LoadBalancers (or 'NodePort' if using a cloud provider) for your web application, exposing it to the outside world. - Ensure the service points to the application deployment.
4. Verify the Setup: - Ensure all resources are created successfully by running 'kubectl get all' - Access the web application through the external IP address exposed by the LoadBalancer service. - Verify that tne application can connect to the database. By following these steps, you've created a secure setup where the database is only accessible from within the cluster, while your web application can communicate With the database and expose its services to the outside world. , You have a Kubernetes cluster with multiple namespaces: 'dev', 'staging', and 'production'. You need to implement a network policy that allows pods in the 'dev' namespace to access services running in the 'staging' namespace. POdS in the 'dev' namespace should only be allowed to connect to ports 80 and 443 on the services in the 'staging' namespace. Implement the network policy configuration. A. See the solution below with Step by Step Explanation. Answer: A
NEW QUESTION # 81 
Task:
1) First update the Deployment cka00017-deployment in the ckad00017 namespace:
Role userUI
2) Next, Create a NodePort Service named cherry in the ckad00017 nmespace exposing the ckad00017-deployment Deployment on TCP port 8888 See the solution below.
Answer:
Explanation:
Explanation
Solution:
Text Description automatically generated
Text Description automatically generated
Text Description automatically generated
NEW QUESTION # 82
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 # 83
You need to design a mufti-container Pod that includes a main application container and a sidecar container- The sidecar container should periodically check the health of the main application container using a health Check mechanism. If tne main application container iS unhealthy, the sidecar container should take corrective actions like restarting the main container or sending an alert. Explain how you can accomplish this using a sidecar container and health check probes.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the Pod configuration: Create a Pod with two containers: the main application container and the sidecar container.
2. Configure the main application containers health check: Define a SlivenessPr0be' for the main container. This probe will periodically check the containers health using the specified mechanism. The probe will restart the container if it's unhealthy.
- specifies a TCP port to check. - 'initialDelaySeconds:' sets the delay before the first probe. - 'periodSeconds:' determines the frequency of health checks. - 'tailureThreshold:' specifies the number of consecutive tailed probes before restarting the container 3. Create the sidecar container: Design a sidecar container that monitors tne main containers health status. This container can be responsible for: - Observing health check results: Receive health check results from the main container. - Taking corrective actions: It the main container becomes unhealthy, the sidecar cam - Restart the main container: Use Kubernetes restart policy or 'execs commands to restart the main container. - Send alerts: Integrate with a monitoring system to send alerts about the main container's health issues. 4. Implement sidecar logic: Implement the necessary logic in the sidecar container to handle the health checks, perform corrective actions, and potentially interact witn a monitoring system. bash # Sidecar Dockerfile FROM ubuntu:latest # (add your monitoring and restart logic) # Start a process to periodically check main application container health CMD ["sh", "-c", "while true; do sleep 20; curl -s http://main-app:8080; exit 0; done"] 5. Test and monitor: Test the Pod's functionality by simulating a health issue in the main container. Ensure the sidecar container successfully identifies the issue and takes corrective actions. Monitor logs from both containers to validate the health check process and sidecar containers actions. This approach uses the sidecar container to monitor the health of the main application container, effectively managing the application's health and ensuring responsiveness to potential failures. ,
NEW QUESTION # 84
......
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