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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Application Deployment | 20% | - Use Kubernetes primitives to implement common deployment strategies (e.g., blue/green or canary) - Understand Deployments and how to perform rolling updates - Kustomize - Use the Helm package manager to deploy existing packages |
| Topic 2: Application Design and Build | 20% | - Understand multi-container Pod design patterns (e.g., sidecar, init and others) - Utilize persistent and ephemeral volumes - Define, build and modify container images - Choose and use the right workload resource (Deployment, DaemonSet, CronJob, etc.) |
| Topic 3: Application Observability and Maintenance | 15% | - Implement probes and health checks - Debugging in Kubernetes - Understand API deprecation policies - Utilize container logs - Use built-in CLI tools to monitor Kubernetes applications |
| Topic 4: Services and Networking | 20% | - Provide and troubleshoot access to applications via services - Use Ingress rules to expose applications - Demonstrate basic understanding of NetworkPolicies |
| Topic 5: Application Environment, Configuration and Security | 25% | - ServiceAccounts - Understanding and defining resource requirements, limits and quotas - Discover and use resources that extend Kubernetes (CRD, Operators) - SecurityContexts - ConfigMaps and Secrets - Understand authentication, authorization and admission control |
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NEW QUESTION # 23
You are building a microservice that requires a specific configuration file to be mounted into the container This configuration file should be updated witnout restarting tne microservice container. How can you achieve this using Kubernetes?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. use ConfigMaps:
- Create a 'ConfigMap' to store the configuration file.
- Create a YAML file (e.g., 'config.yamIS) with your configuration content:
2. Mount the ConfigMap: - In your 'Deployment definition, mount the 'configMap' into the container using a volume mount
3. Update the Configuration: - IJpdate the 'ConfigMap' directly using ' kubectl patch configmap my-microservice-config -type-merge -p '{"data": {"config-json"' "updated - The changes will be reflected in the mounted volume inside the container. 4. Access the Configuration: - Your microservice code should read the configuration file from the mounted path (e.g., '/etc/config')- Note: This approach avoids restarting the container when you need to update the configuration. The 'ConfigMaps acts as a persistent volume, and changes to its content are automatically reflected in the mounted volume inside the container
NEW QUESTION # 24
You are building a Kubernetes application that requires access to sensitive credentials stored in a Secret. The application should only have access to specific keys within the Secret, and you need to ensure that the Secret is updated without disrupting the application's functionality. How would you design and implement this functionality using Custom Resource Definitions (CRDs) and Kubernetes resources?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define a CRD for Secret Access:
- Create a Custom Resource Definition (CRD) named 'SecretAccess' , representing the required access to the Secret. This CRD will define the following fields:
- 'secretName': The name ot the Secret containing the sensitive information.
- 'allowedKeys': A list of keys from the Secret that the application is allowed to access.
- The 'SecretAccess' CRD schema will be validated to ensure that the specified Secret and keys exist.
2. Create a Controller for SecretAccess CRD. - Implement a Kubernetes controller that watches for changes in 'SecretAccesS resources. - When a new 'SecretAccesS resource is created or updated, the controller: - Validates the specified Secret and allowed keys. - Creates or updates a new 'Secret resource with the requested keys from the original Secret. - Updates the 'SecretAccess' resource status with the name of the generated Secret.
3. Create a SecretAccess Resource: - Define a 'SecretAccess' resource specifying the target Secret and allowed keys.
4. Update the Application to IJse the Generated Secret: - Modify your application to use the generated Secret, whiCh will contain only the allowed keys. - The generated Secret name can be retrieved from the "SecretAccess' resource status. - The application can access the Secret using the Kubernetes API, similar to accessing a regular Secret.
- The SecretAccesS CRD acts as a resource request for access to specific keys from a Secret_ - The controller ensures that only the requested keys are made available to the application, enhancing security. - By generating a separate Secret for each application with limited access, you prevent accidental exposure ot sensitive data. - The automated update mechanism of the controller allows you to update the original Secret without disrupting the application.,
NEW QUESTION # 25
You are running a web application with two replicas. You need to ensure that there is always at least one replica available while updating the application. You also need to have a maximum of two replicas during the update. How would you configure a rolling update strategy for your Deployment?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Llpdate the Deployment YAMLI
- Define 'strategy.type' to 'Rollingupdate' to trigger a rolling update when the deployment is updated.
- Update the 'replicas' to 2 to start with.
- Set 'maxi-Jnavailable' to to ensure at least one pod remains running during the update.
- Set 'maxSurge' to to allow for a maximum of two replicas during the update.
2. Create or Llpdate the Deployment - Apply the updated YAML file using 'kubectl apply -f my-app-deploymentyamr - If the deployment already exists, Kubernetes will update it with the new configuration- 3. Trigger the Update: - Update the image of your application to a newer version. - You can trigger the update by pushing a new image to your container registry. 4. Monitor the Update: - Use 'kubectl get pods -l app=my-apps to monitor the pod updates during the rolling update process. - Observe the pods being updated one at a time, ensuring that there's always at least one replica available. 5. Check for Successful Update: - Once the update is complete, use 'kubectl describe deployment my-app' to verify that the 'updatedReplicas' field matches the 'replicas field.
NEW QUESTION # 26
You are deploying a web application that uses a separate database pod. The database pod is managed by a StatefulSet, and the web application pods need to access the database using tne database pod'S nostname. Explain how you can configure the web application pods to access the database pod using the hostname provided by the StatefulSet.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Configure the StatefulSet:
- Define the database pod within a StatefulSet.
- Ensure that the StatefulSet assigns a unique hostname to each pod, making it accessible by name-
- Example:
2. Configure the Deployment: - Denne the web application pod Within a Deployment. - Use the 'hostAliaseS field in the Deployment's 'spec.template.spec.containers' to map the database pod's hostname to its IP address. - Example:
3. Access Database by Hostname: - Within tne web application's code, you can now access the database using the hostname "database-service" without needing to know the database pod's actual IP address. - Kubernetes will automatically resolve the hostname to the correct IP address based on the hostAliases configuration. 4. Deploy and Test: - Deploy the StatefulSet and Deployment. - Test the web application to ensure that it can connect to the database using the provided hostname. 5. Important - The ' hostAliases' approach is typically used for cases where the database pod's hostname is consistent and predictable. - It might not be suitable for scenarios involving dynamic pod scaling or where the database pod's hostname changes frequently. - In those scenarios, consider using a Service and Service discovery mechanism to connect to the database.
NEW QUESTION # 27
You have a Deployment named 'wordpress-deployment' that runs a WordPress application. You want to ensure that Kubernetes automatically restarts pods if tney experience an unexpected termination, such as a container crasn. Implement the necessary configuration for your deployment.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Update the Deployment YAML:
- Add the 'restartpolicy: Always to the 'spec.template_spec.containers' section of your Deployment YAML. This ensures that the pod will always be restarted if a container terminates unexpectedly.
2. Apply the Deployment - Apply the updated Deployment YAML using: bash kubectl apply -f wordpress-deployment-yaml 3. Test the Restart Policy: - Simulate a container crash within a pod (e.g., by sending a SIGKILL Signal to the container). - Observe the pod status using 'kuactl get pods -l app=wordpress' . You snould see the pod being automatically restarted, and the 'STATUS should become 'Running' again. Important Note: - The restaAPolicy: Always' is the default setting for Kubernetes deployments. By explicitly adding it to your YAML, you ensure that this behavior is documented and consistent within your deployment configuration.,
NEW QUESTION # 28
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