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| Section | Objectives |
|---|---|
| Topic 1: Application Observability and Maintenance | - Monitor and troubleshoot applications - Understand probes and health checks |
| Topic 2: Application Design and Build | - Define, build and modify container images - Understand multi-container Pod design patterns - Understand Jobs and CronJobs |
| Topic 3: Services and Networking | - Pod networking concepts - Services (ClusterIP, NodePort) - Ingress basics |
| Topic 4: Application Environment, Configuration and Security | - ConfigMaps and Secrets usage - Security contexts and service accounts |
| Topic 5: State Persistence | - PersistentVolumes and PersistentVolumeClaims - Storage classes and volume mounting |
| Topic 6: Application Deployment | - Use Kubernetes primitives to implement deployments - Understand rolling updates and rollbacks |
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NEW QUESTION # 104
You have a Kubernetes cluster with a Deployment named 'my-app' running a simple web application. The 'my-app' Deployment is configured to use a ServiceAccount named 'my-app-sa' _ You want to ensure that only authorized users with specific permissions can access the 'my-app' pod's logs. How would you implement this using Role-Based Access Control (RBAC)?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Create a Role:
- Define a new Role named 'my-app-log-reader' that grants access to read logs of the 'my-app' pod.
- This role will be bound to the ServiceAccount used by the 'my-app' Deployment.
2. Create a RoleBinding: - Create a RoleBinding named 'my-app-log-reader-binding' to link the 'my-app-log-reader' Role to the 'my-app-sa' ServiceAccount. - This binding allows the 'my-app-sa' to use the permissions defined in the 'my-app-log-reader' role.
3. Apply the Configurations: - Apply the Role and RoleBinding YAML files to your Kubernetes cluster using 'kubectl apply -f role.yamr and 'kubectl apply -f rolebinding_yamr 4. verify the RBAC: - Once applied, you can verify the RBAC configuration by using 'kubectl auth can-i get pods --as=my-app-sa --namespace=' - This command should show 'yes' indicating that the ServiceAccount can access pods. - You can also check for access to logs with a similar command: 'kubectl auth can-i get pods/my-app-pod-name --namespace=' - Replace "my-app-pod-name' with the actual pod name of the application. 5. Test Access: - Try accessing the logs using "kubectl logs my-app-pod-name -n ' while impersonating the ServiceAccount 'my-app-sa' - You should be able to view the logs successfully. If any user tries to access the logs without the necessary permissions, they will be denied. Important Note: This is a basic example and can be further Kustomize d depending on your specific security needs. You can adjust the 'rules' in the Role definition to control specific permissions for users or ServiceAccounts. For example, you might restrict access to certain namespaces or resources. ]
NEW QUESTION # 105
You must connect to the correct host . Failure to do so may result in a zero score.
[candidate@base] $ ssh ckad00033
Task
A Dockerfile has been prepared at /home/candidate/build/Dockerfile.
Using the prepared Dockerfile, build a container image with the name macaque and tag 1.2. You may install and use the tool of your choice.
Multiple image builders and tools have been pre-installed in the base system, including: docker, skopeo, buildah, img , and podman.
Please do not push the built image to a registry, run a container, or otherwise consume it.
Using the tool of your choice, export the built container image in OCI or Docker image format and store it at
/home/candidate/macaque-1.2.tar.
Answer:
Explanation:
See the Explanation below for complete solution.
Explanation:
Understood - I'll redo Question 13 without using any # (or similar) icons.
ssh ckad00033
This task is only about building and exporting a container image.
You must not push it, run it, or consume it in any way.
You may use any image builder. Below are clean, correct solutions. Use one of them.
Option A: Using Docker
1) Go to the Dockerfile location
cd /home/candidate/build
ls -l Dockerfile
2) Build the image
Image name: macaque
Tag: 1.2
docker build -t macaque:1.2 .
Verify:
docker images | grep macaque
3) Export the image to a tar file
Docker image format is acceptable.
docker save macaque:1.2 -o /home/candidate/macaque-1.2.tar
Verify the file exists:
ls -lh /home/candidate/macaque-1.2.tar
Do not load or run the image.
Option B: Using Podman (rootless alternative)
1) Build the image
cd /home/candidate/build
podman build -t macaque:1.2 .
Verify:
podman images | grep macaque
2) Export the image
podman save macaque:1.2 -o /home/candidate/macaque-1.2.tar
Verify:
ls -lh /home/candidate/macaque-1.2.tar
Option C: Using Buildah (OCI format)
cd /home/candidate/build
buildah bud -t macaque:1.2 .
buildah push macaque:1.2 oci-archive:/home/candidate/macaque-1.2.tar
NEW QUESTION # 106
You have a Kubernetes application that uses a Deployment named sweb-app' to deploy multiple replicas of a web server pod. This web server application needs to be accessible through a public IP address. You are tasked with implementing a service that allows users to access the application from outside the cluster. However, the service should exposed via a specific port number (8080), regardless ot the port that the web server listens on inside the pods.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create the Service YAMI-:
- Define the service type as 'LoadBalancer' to expose it via a public IP
- Set the 'targetPort' to the port that the web server listens on inside the pods (let's assume it's 8080)-
- Set the 'port' to 8080, which will be the port used to access the service from outside the cluster.
2. Apply the Service: - Use 'kubectl apply -f web-app-service.yaml' to create the service- 3. Get the External IP: - Once the service iS created, use 'kubectl get services web-app-services to get the external IP address. This will be assigned by the cloud provider and will be available for users to access the application. 4. Test the Service: - Access the application using the external IP address and port 8080. For example, if the external IP is '123.45.67.89' , you would access the application through 'http://123.45.67.89:8080' ,
NEW QUESTION # 107
You have a Kubernetes cluster with a Deployment that runs a critical web application. The application's codebase is in a Git repository, and you want to automatically deploy a new version of the application whenever a new commit is pushed to the 'master branch ot the repository. You need to ensure that the deployment process iS seamless and doesn't result in downtime for the web application.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Set up a Git repository:
- Create a Git repository on a platform like GitHub, GitLab, or Bitbucket.
- Store your web application's code in this repository
2. Configure a webhook:
- Go to the settings of your Git repository and configure a webhook.
- The webhook URL should point to your Kubernetes clusters API server.
- Set the webhook event to 'push' and the branch to 'master
3. Create a Deployment
- Create a Deployment YAML file with the following configuration:
4. Create a Kubernetes Secret: - Store your Git repository's credentials in a Kubemetes secret - This secret will be used to authenticate the webhook request from your Git repository. 5. Create a Job: - Create a Job YAML file with the following configuration:
6. Apply the resources: - Apply the Deployment, Secret, and Job YAML files to your Kubernetes cluster 7. Test the deployment: - Push a new commit to the 'master' branch of your Git repository. - Observe that the Job runs and updates the Deployment with the new image. - VeriSi that the web application is still accessible during the update process.
NEW QUESTION # 108
You are building a container image for a Spring Boot application that connects to a MySQL database. The application requires specific environment variables, such as the database nostname, username, password, and port. How would you define these environment variables Within the Docker-file to ensure the application runs correctly in a Kubernetes cluster?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
1. Define Environment Variables in Docker-file:
- Utilize the 'ENV' instruction within your Dockerfile to set the necessary environment variables.
- These variables will be accessible to your Spring Boot application during runtime.
- Example:
dockerfile
2. Build the Docker Image: - Construct your Docker image using the Docker-file. - Run the following command: 'docker build -t your-image-name 3. Deploy to Kubernetes: - Create a Deployment or Pod in Kubernetes that utilizes your built image. - Ensure the pod's environment variables align with the ones defined in your Dockerfile. - Example (Deployment YAML):
4. Verify Application Functionality: - Access your deployed application in the Kubernetes cluster. - Verify that it connects successfully to the database and operates as expected.
NEW QUESTION # 109
......
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