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| Section | Weight | Objectives |
|---|---|---|
| Application Environment, Configuration and Security | 25% | - Use ServiceAccounts - Use custom resources and extensions - Work with ConfigMaps - Understand authentication, authorization and admission control - Create and consume Secrets - Apply application security settings - Configure resource requirements, limits and quotas |
| Application Observability and Maintenance | 15% | - Monitor applications using CLI tools - Understand API deprecations - Implement probes and health checks - Work with container logs - Debug applications in Kubernetes |
| Services and Networking | 20% | - Understand and apply NetworkPolicies - Troubleshoot network access - Expose applications via Services - Use Ingress rules |
| Application Deployment | 20% | - Work with Kustomize - Implement deployment strategies - Use Helm package manager - Manage Deployments, rolling updates and rollbacks |
| Application Design and Build | 20% | - Utilize persistent and ephemeral volumes - Choose and use appropriate workload resources - Define, build and modify container images - Understand multi-container Pod design patterns |
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NEW QUESTION # 185
You have a Kubernetes cluster With a Deployment named 'my-app' running multiple replicas of your application. You need to ensure that only authorized users can access the application's pods through the Kubernetes APL Implement a role-based access control (RBAC) policy that allows only users in the "developers' group to access the pods of the 'my-app' Deployment.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Role: Define a Role that grants access to the 'my-app' Deployment pods.
2. Create a RoleBinding: Bind the created Role to the 'developers' group.
3. Apply the Role and RoleBinding: use 'kubectl apply' to create the Role and ROIeBinding resources. bash kubectl apply -f my-app-pod-readenyaml kubectl apply -f my-app-pod-reader-binding.yaml 4. Verify Access: Attempt to access the pods of the 'my-app' Deployment from a user in the "developers' group. You should be able to access the pods. Attempt to access the pods from a user not in the 'developers' group. You should receive an error indicating insufficient permissions.,
NEW QUESTION # 186
You are managing a Kubernetes cluster running a web application. You need to create a CronJob that automatically updates the web application's database every night at 1:00 AM. The database update script iS located in a container image named 'database-update:vl'. The script requires the following environment variables: 'DATABASE_HOST' , 'DATABASE_USER' , and 'DATABASE_PASSWORD'. How would you create the CronJob YAML file to achieve this?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Create the CronJob YAML file:
- Stan by creating a YAML file named 'database-update-cronjob.yaml' with the following structure:
2. Create a Secret for database credentials: - Create a Kubernetes secret named 'database-credentials' to store the sensitive database credentials:] bash kubectl create secret generic database-credentials \ --trom-literal=DATA8ASE HOST=your_database host \ --from-literal=DATA8ASE_USER=your_database_user --from-literal=DATA8ASE_PASSWORD=your_database_password 3. Apply the CronJob: - Apply the CronJ0b YAML file using 'kubectl apply -f database-update-cronjob.yamr. 4. Verify the CronJob: - Check the status of the CronJob using "kubectl get cronjobs" and ensure that it is scheduled successfully. - 'schedule': Defines the schedule for the CronJ0b. In this case, it's set to "0 1 ", which means the job will run at 1:00 AM every day. - 'jobTemplate': Specifies the template for the job that will be created by the CronJob. - 'containers': Defines tne container that will run tne database update script. - 'images: Sets the image for the container, which is 'database-update:vl' - 'command': Defines the command to be executed in the container. - Specifies the environment variables required for the database update script. In this case, the variables are retrieved from a Kubernetes secret named 'database-credentials' to ensure secure storage of sensitive information. - 'backoffLimit: Sets the maximum number of retries if the job fails. ,
NEW QUESTION # 187
You are tasked with deploying a stateful application, a distributed database, that requires persistent storage and consistent ordering of pods. The application's pods need to communicate With each other using a specific port (5432). How would you configure a StatefulSet to achieve this?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create the StatefulSet YAML:
2. Create a PersistentVolumeClaim (PVC):
3. Apply the StatefulSet and PVC: bash kubectl apply -f statefulset.yaml kubectl apply -f pvc.yaml 4. Check the StatefuISet and Pods: bash kubectl get statefulsets my-database kubectl get pods -l app=my-database - StatefulSet This defines the desired state for the database pods, ensuring tneir order and persistent storage. - serviceName: This field defines the service name used to access the database instances. - replicas: Defines the desired number of database instances (3 in this example). - selector: Matches pods with the "app: my-database" label. - template: Defines the pod template to use for each instance. - containers: Contains the database container definition. - ports: Exposes the database's internal port (5432) to the outside world. - volumeMounts: Mounts the persistent volume claim to the container's storage directory. - volumes: Defines the volume to use, in this case, a persistent volume claim. - persistentVolumeClaim: Links the StatefulSet to the PVC- - PVC (my-database-pvc): Requests a persistent volume of 1 Gi for each database pod. This ensures data persistence between restarts. - accessM0des: ReadWriteOnce: Allows only one pod to access the volume at a time. - resources-requests-storage: Specifies the storage request for each PVC- This setup ensures that each database pod: - Has a unique name based on its ordinal position within the StatefulSet - Has persistent storage using the PVC. - Can communicate with otner pods through the defined service. - Maintains consistent ordering, essential for distributed database functionality
NEW QUESTION # 188
Context
Task:
1) First update the Deployment cka00017-deployment in the ckad00017 namespace:
To run 2 replicas of the pod
Add the following label on the pod:
Role userUI
2) Next, Create a NodePort Service named cherry in the ckad00017 nmespace exposing the ckad00017-deployment Deployment on TCP port 8888
Answer:
Explanation:
Solution:
NEW QUESTION # 189
You have a Deployment named 'wordpress-deployment' that runs 3 replicas of a WordPress container. You want to implement a blue- green deployment strategy for this deployment This strategy should involve creating a new replica set with the updated image, and then gradually shitting traffic to the new replica set. After the traffic has been shifted, the old replica set should be deleted. This process should be fully automated whenever a new image is pushed to the Docker Hub repository 'example/wordpress:latest'
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Kubernetes Secret for Docker Hub Credentials:
- You'll need a Secret to securely store your Docker Hub credentials for pulling images. Create a Secret with the following YAML:
- Replace with the base64 encoded content of your Docker Hub credentials file. This file is typically named '~/.docker/config.json' and contains your Docker Hub username and password. You can create this file or update it manually. To encode the file, use a command like 'base64 ~/.docker/config .jsons 2. Create a ConfigMap for Deployment Configuratiom - Create a ConfigMap to hold the image name and any other deployment-specific configuration:
3. Define a Deployment with a Blue-Green Strategy: - Create a Deployment named swordpress-deployment that incorporates the blue-green deployment strategy. This Deployment will have a 'strategy' section with a 'type' of 'Recreate' (for initial deployment) and a 'blueGreenDeploymentStrategy' section: 4. Create a Service.
- Create a Kubernetes Service that exposes your WordPress application. This service will automatically route traffic to the active replica set.
5. Automate the Blue-Green Deployment - Use a 'DeploymentConfig' resource to configure the automatic deployment
6. Apply the resources: - Apply all the YAML files using 'kubectl apply -f' to create the necessary resources. 7. Trigger the Blue-Green Deployment - Push a new image to the Docker Hub repository 'example/wordpress:latest' The 'Deploymentconfig' will automatically trigger the blue-green deployment: -A new replica set with the updated image will be created, and traffic will be shifted to the new replica set gradually - Once the traffic has been shifted, the old replica set will be deleted. Note: This implementation assumes that you are using OpenShift. If you are using a different Kubernetes distribution, the configuration may need to be adjusted SligntlY. ,
NEW QUESTION # 190
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