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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Services and Networking | 20% | - Provide and troubleshoot access to applications via services - Use Ingress rules to expose applications - Demonstrate basic understanding of NetworkPolicies |
| Topic 2: Application Environment, Configuration and Security | 25% | - Understand authentication, authorization and admission control - SecurityContexts - Understanding and defining resource requirements, limits and quotas - ConfigMaps and Secrets - ServiceAccounts - Discover and use resources that extend Kubernetes (CRD, Operators) |
| Topic 3: Application Design and Build | 20% | - Understand multi-container Pod design patterns (e.g., sidecar, init and others) - Utilize persistent and ephemeral volumes - Choose and use the right workload resource (Deployment, DaemonSet, CronJob, etc.) - Define, build and modify container images |
| Topic 4: Application Observability and Maintenance | 15% | - Debugging in Kubernetes - Use built-in CLI tools to monitor Kubernetes applications - Implement probes and health checks - Understand API deprecation policies - Utilize container logs |
| Topic 5: Application Deployment | 20% | - Use Kubernetes primitives to implement common deployment strategies (e.g., blue/green or canary) - Use the Helm package manager to deploy existing packages - Understand Deployments and how to perform rolling updates - Kustomize |
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NEW QUESTION # 205
Exhibit:
Task
A deployment is falling on the cluster due to an incorrect image being specified. Locate the deployment, and fix the problem.
Answer: A
NEW QUESTION # 206
You are tasked with deploying an application with a deployment named 'web-app' that requires a specific SecurityContext to run. The application should be able to access a specific hostPath volume mounted at '/data' and should be able to run as a non-root user with a specific UID. You need to define the Securitycontext in your Deployment configuration to ensure the application runs with the required privileges and access.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the Securitycontext in the Deployment YAML:
- Create a 'securityContext' section within the 'spec-template.spec.containerss block for your application container
- Set the 'runAsLJser' field to the desired non-root IJID (e.g., 1000).
- Specify 'allowPrivilegeEscalatiom false' to prevent the container from escalating its privileges beyond the defined CJID.
- Add a 'hostPatm volume mount with 'readOnly: false' to allow the application to read and write to the mounted directory.
- Define a 'volume' with the 'hostPath' type, specifying the source path (e.g., ',/data') and the path within the container where it should be mounted.
2. Create the Deployment: - Apply the Deployment YAML file using 'kubectl apply -f web-app-deployment.yamr 3. Verify the Deployment - Check the status of the Deployment using 'kubectl get deployments web-app'. You should see a running pod with the specified Securitycontext. - Use kubectl describe pod' to inspect the details of the pod and verify that the Securitycontext is applied correctly. 4. Test the Application: - Ensure that your application can access and modify the '/data' volume with the specified user ID (1000). - The 'securitycontext' allows you to define security settings for the application container, such as user ID and privilege escalation- - 'runAsIJsers specifies the IJID under which the container should run. - 'allowPrivilegeEscalation' controls whether the container can elevate its privileges beyond the specified IJID. - 'hostPath' volume mounts allow containers to access directories on the host system. - 'readOnly' determines whether the volume mount iS read-only or read-write. - Ensure your container image has the necessary permissions to access the hostPath volume within the specified UID.
NEW QUESTION # 207
You are tasked with creating a highly available, scalable, and stateful application that handles user profiles and associated dat a. The application must be able to handle high write and read traffic and ensure data consistency. Which Kubernetes resource is best suited tor this scenario and why? Additionally, provide a code snippet illustrating the deployment of this resource with three replicas, each storing user data in a persistent volume.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Identify the Suitable Resource:
- The best Kubernetes resource for this scenario is a StatefulSet.
- StatefulSets provide unique network identities and persistent storage for each pod, making them ideal for stateful applications. They ensure ordered deployments and rollbacks, guaranteeing that pods are always launched in a specific order and with consistent data
2. Code Snippet
- StatefulSet Definition: Defines the StatefulSet With the name "user-profile-app", sets the replica count to 3, and defines a selector that matches pods with the label "app: user-profile-app". - Service Definition: Sets up a service named "user-profile-service" that exposes the application on port 8080. - Template: Defines tne pod template for each replica. - Container: Specifies the container image, port mapping, and volume mounting for the user datm - Volume Mounts: Mounts the persistent volume claim "user-data" to the ' Idata' directory inside the container. - Volumes: Defines tne persistent volume claim "user-data" which is linked to a PersistentVolumeClaim named "user-data-pvc." - PersistentVolumeClaim: Defines a PersistentVolumeClaim named "user-data-pvc" to request a persistent volume with 1 Gi storage- 4. Deployment Steps: - Create the PersistentVolumeClaim (PVC) using kubectl apply -f user-profile-app.yamr - Create the StatefulSet using 'kuactl apply -f user-profile-app.yaml' - Access the application through the service name "user-profile-service" This setup creates a highly available and scalable application that ensures data persistence and consistency across three replicas. ]
NEW QUESTION # 208
You have a Kubernetes cluster with a deployment named 'myapp'. This deployment utilizes a service account named 'my-sas to access a private registry. You need to grant this service account access to pull images from the registry, which requires an image pull secret named 'my-secret How would you configure the service account to use this image pull secret and ensure your myapp' deployment can successfully pull images?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Service Account:
- If you haven't already, create a service account named 'my-sa':
- Apply this YAML file using 'kubectl apply -f my-sa.yaml. 2. Create an Image Pull Secret: - Create a secret containing the necessary credentials for your private registry:
- Replace with the base64 encoded contents of your Docker configuration file. You can obtain this by using 'cat ~/.docker/config.json | base64'. - Apply the YAML file using 'kubectl apply -f my-secret.yaml' 3. Associate the Secret with the Service Account: - Add the 'my-secret' secret to tne 'my-sa' service account:
- Apply this YAML file using ' kubectl apply -f my-sa_yamr 4. Update Deployment with Service Account - Update the deployment configuration for 'myapp' to use the 'my-sa' service account.
- Ensure that 'your-private-registry', 'your-image', and 'your-tag' match the details of your private registry image. - Apply the updated deployment configuration using 'kubectl apply -f myapp.yamr 5. Verify Deployment: - Check the status of the deployment using ' kubectl get deployments myapp'. You should see the pods successfully pulling images from your private registry Important Notes: - Security Best Practices: Always use dedicated service accounts with minimal permissions. - Image Pull Secret: The 'my-secret' secret should be securely stored and managed. - Namespace: Ensure that both the service account and secret are in the same namespace as your deployment. - Registry Authentication: Ensure your private registry is configured with proper authentication for your service account credentials.,
NEW QUESTION # 209 
Task:
Update the Pod ckad00018-newpod in the ckad00018 namespace to use a NetworkPolicy allowing the Pod to send and receive traffic only to and from the pods web and db
Answer:
Explanation:
See the solution below.
Explanation:
Solution:
NEW QUESTION # 210
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