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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: 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 |
| Topic 2: Application Design and Build | 20% | - Understand multi-container Pod design patterns - Choose and use appropriate workload resources - Define, build and modify container images - Utilize persistent and ephemeral volumes |
| Topic 3: Application Deployment | 20% | - Work with Kustomize - Use Helm package manager - Implement deployment strategies - Manage Deployments, rolling updates and rollbacks |
| Topic 4: Services and Networking | 20% | - Use Ingress rules - Expose applications via Services - Troubleshoot network access - Understand and apply NetworkPolicies |
| Topic 5: Application Environment, Configuration and Security | 25% | - Use custom resources and extensions - Use ServiceAccounts - Create and consume Secrets - Apply application security settings - Work with ConfigMaps - Understand authentication, authorization and admission control - Configure resource requirements, limits and quotas |
This kind of polished approach is beneficial for a commendable grade in the Linux Foundation Certified Kubernetes Application Developer Exam (CKAD) exam. While attempting the exam, take heed of the clock ticking, so that you manage the Linux Foundation CKAD questions in a time-efficient way. Even if you are completely sure of the correct answer to a question, first eliminate the incorrect ones, so that you may prevent blunders due to human error.
NEW QUESTION # 180
You're building a Kubernetes application that manages user profiles and requires a custom resource for storing profile information. Design a custom resource definition (CRD) and its corresponding controller, ensuring that every time a profile is created or updated, a unique user ID is assigned to the profile.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create the Custom Resource Definition (CRD)I
- Define the CRD Spec:
- Apply the CRD: bash kubectl apply -f profile-crd_yaml 2. Create a Controller for the Custom Resource: - Define the Controller Logic:
- Check the 'userld' field in the output You should see the automatically generated unique user ID. This comprehensive solution demonstrates how to implement a custom resource definition and a controller for managing user profiles in Kubernetes. You can adjust the code and logic according to your specific requirements. ,
NEW QUESTION # 181
You have a ConfigMap named 'database-config' tnat stores sensitive information for connecting to a database. You want to ensure that this ConfigMap is only accessible by a specific namespace and not by other namespaces in the cluster.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Namespace:
bash
kubectl create namespace my-database-namespace
2. Move the ConfigMap to the Namespace:
bash
kubectl move configmap database-config -n my-database-namespace
3. Configure Role-Based Access Control (RBAC):
- Create a Role:
- Create a RoleBinding:
- Replace 'my-service-account with the actual name of the service account that needs access to the ConfigMap. 4. Apply the Role and Role3inding: bash kubectl apply -f database-config-reader.yaml kubectl apply -f database-config-reader-binding.yaml 5. Verify Access: - From the 'my-database-namespace': bash kubectl get configmap database-config -n my-database-namespace The command should succeed as the service account in this namespace has the necessary permissions. - From a different namespace: bash kubectl get configmap database-config -n another-namespace This command should fail as the service account in this namespace does not have access to the ConfigMap. This solution uses RBAC to restrict access to the ConfigMap to only the service account in the 'my-database-namespace'. This ensures that sensitive information is only accessible by authorized entities within the cluster,
NEW QUESTION # 182
You have a microservice application that consists of two components: a web server (using Nginx) and a database (using PostgreSQL). The web server needs to access the database through a local connection, but due to network security restrictions, the web server cannot connect to the database directly. Describe how you can utilize a sidecar container to resolve this issue and ensure the database connection is secure.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Sidecar Container:
- Define a new container in your Deployment's 'spec-template-spec-containers' array, alongside the existing Nginx container. This new container will house the necessary tools for facilitating a secure database connection.
- Name this container appropriately, for example, 'database-proxy'
- Choose an image that contains the required software for database connection, such as 'postgres' or 'postgresqr
- Use a sidecar pattern in the Deployment YAML file. You can specify the sidecar in the container array in the Pod specification:
2. Database Connection Configuration: - Configure the sidecar container to connect to the database. - Establish a connection using the database user credentials and connection string. - If you use a secure connection, ensure that the certificates and private keys are accessible to the sidecar container. 3. Communication Between Containers: - Configure your web server container to communicate with the sidecar container. - Use environment variables to specify the hostname and port of the sidecar container, enabling the web server to connect to the database proxy within the pod. 4. Volume Sharing: - Optionally, share a volume between the web server and the sidecar container to facilitate shared data access, such as database configuration files. 5. Deploy the Deployment: - Apply the updated Deployment YAML file to your Kubernetes cluster using 'kubectl apply -f my-app.yaml' 6. Test the Application: - Access your web server application and confirm that it successfully connects to the database through the sidecar container.
NEW QUESTION # 183
Refer to Exhibit.
Task:
1) Create a secret named app-secret in the default namespace containing the following single key-value pair:
Key3: value1
2) Create a Pod named ngnix secret in the default namespace.Specify a single container using the nginx:stable image.
Add an environment variable named BEST_VARIABLE consuming the value of the secret key3.
Answer:
Explanation:
Solution:
NEW QUESTION # 184
Exhibit:
Context
Your application's namespace requires a specific service account to be used.
Task
Update the app-a deployment in the production namespace to run as the restrictedservice service account. The service account has already been created.
Answer: A
NEW QUESTION # 185
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