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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Application Observability and Maintenance | 15% | - Utilize container logs - Use built-in CLI tools to monitor Kubernetes applications - Debugging in Kubernetes - Implement probes and health checks - Understand API deprecation policies |
| Topic 2: Services and Networking | 20% | - Demonstrate basic understanding of NetworkPolicies - Provide and troubleshoot access to applications via services - Use Ingress rules to expose applications |
| 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 Deployment | 20% | - Kustomize - Use Kubernetes primitives to implement common deployment strategies (e.g., blue/green or canary) - Understand Deployments and how to perform rolling updates - Use the Helm package manager to deploy existing packages |
| Topic 5: Application Environment, Configuration and Security | 25% | - ConfigMaps and Secrets - Understanding and defining resource requirements, limits and quotas - Understand authentication, authorization and admission control - SecurityContexts - Discover and use resources that extend Kubernetes (CRD, Operators) - ServiceAccounts |
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NEW QUESTION # 107
Context
Task
You are required to create a pod that requests a certain amount of CPU and memory, so it gets scheduled to-a node that has those resources available.
* Create a pod named nginx-resources in the pod-resources namespace that requests a minimum of 200m CPU and 1Gi memory for its container
* The pod should use the nginx image
* The pod-resources namespace has already been created
Answer:
Explanation:
Solution:
NEW QUESTION # 108 
Task
Create a new deployment for running.nginx with the following parameters;
* Run the deployment in the kdpd00201 namespace. The namespace has already been created
* Name the deployment frontend and configure with 4 replicas
* Configure the pod with a container image of lfccncf/nginx:1.13.7
* Set an environment variable of NGINX__PORT=8080 and also expose that port for the container above
Answer:
Explanation:
See the solution below.
Explanation:
Solution:
NEW QUESTION # 109
You have a multi-container Pod that needs to perform some initialization tasks before the main application containers Stan. These tasks involve setting up a database connection, downloading a configuration file, or running some pre-flight checks. Design a Pod configuration that utilizes an init container to handle these tasks before tne main application containers start Ensure that your solution includes the necessary steps to handle potential errors encountered during the initialization process.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create an init container: Define an init container within your Pod's spec. This container will be responsible for running the initialization tasks before your main application containers start.
2. Define the init container image: Create a Docker image specifically for your init container. This image should contain all the necessary tools and scripts to perform your initialization tasks. basn # Create a Dockerfile for the init container FROM ubuntu:latest RUN apt update && apt install -y mysql-client # (add your initialization tasks here) CMD ["echo", "Database connected"] # Build the Docker image docker build -t example/init-script:latest . 3. Handle potential errors: Use a "lifecycle" nook to handle any errors during tne init container execution. This ensures that if the init container fails, the Pod is restarted, and the initialization process is retried.
This example demonstrates the "poststart" lifecycle hook, which ensures the main application container only starts after the init container successfully completes. 4. Define resources for the init container: Specifr,' resource requirements for your init container (CPU, memory, etc.). This ensures that the initialization process doesn't impact your main application containers resource availability 5. Configure the main application container: Make sure your main application containers configuration is aware of the init containers actions (e.g., the database connection details are available). 6. Monitor and troubleshoot: Monitor your Pod's status to ensure the init container runs successfully. If errors occur, analyze logs from the init container to identify and address the issues. This configuration ensures that your init container executes the initialization tasks before your main application containers start, and provides a mechanism to handle errors during the initialization process.
NEW QUESTION # 110
You need to design a mufti-container Pod that includes a main application container and a sidecar container- The sidecar container should periodically check the health of the main application container using a health Check mechanism. If tne main application container iS unhealthy, the sidecar container should take corrective actions like restarting the main container or sending an alert. Explain how you can accomplish this using a sidecar container and health check probes.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the Pod configuration: Create a Pod with two containers: the main application container and the sidecar container.
2. Configure the main application containers health check: Define a SlivenessPr0be' for the main container. This probe will periodically check the containers health using the specified mechanism. The probe will restart the container if it's unhealthy.
- specifies a TCP port to check. - 'initialDelaySeconds:' sets the delay before the first probe. - 'periodSeconds:' determines the frequency of health checks. - 'tailureThreshold:' specifies the number of consecutive tailed probes before restarting the container 3. Create the sidecar container: Design a sidecar container that monitors tne main containers health status. This container can be responsible for: - Observing health check results: Receive health check results from the main container. - Taking corrective actions: It the main container becomes unhealthy, the sidecar cam - Restart the main container: Use Kubernetes restart policy or 'execs commands to restart the main container. - Send alerts: Integrate with a monitoring system to send alerts about the main container's health issues. 4. Implement sidecar logic: Implement the necessary logic in the sidecar container to handle the health checks, perform corrective actions, and potentially interact witn a monitoring system. bash # Sidecar Dockerfile FROM ubuntu:latest # (add your monitoring and restart logic) # Start a process to periodically check main application container health CMD ["sh", "-c", "while true; do sleep 20; curl -s http://main-app:8080; exit 0; done"] 5. Test and monitor: Test the Pod's functionality by simulating a health issue in the main container. Ensure the sidecar container successfully identifies the issue and takes corrective actions. Monitor logs from both containers to validate the health check process and sidecar containers actions. This approach uses the sidecar container to monitor the health of the main application container, effectively managing the application's health and ensuring responsiveness to potential failures. ,
NEW QUESTION # 111
You are deploying a new application named 'streaming-services that requires 7 replicas. You want to implement a rolling update strategy that allows for a maximum of two pods to be unavailable at any given time. However, you need to ensure that the update process is triggered automatically whenever a new image is pusned to the Docker Hub repository 'streaming/streaming-service:latest'.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Update the Deployment YAMI-:
- Update the 'replicas' to 7.
- Define 'maxunavailable: 2" and 'maxSurge: (Y in the 'strategy.rollingUpdate' section.
- Configure a 'strategy.types to 'Rollingl_lpdates to trigger a rolling update when the deployment is updated.
- Add a 'spec-template.spec.imagePullPolicy: Always' to ensure that the new image is pulled even if it exists in the pod's local cache.
2. Create the Deployment: - Apply the updated YAML file using 'kubectl apply -f streaming-service-deployment-yamr 3. Verify the Deployment - Check the status of the deployment using 'kubectl get deployments streaming-service-deployment to confirm the rollout and updated replica count. 4. Trigger the Automatic Update: - Push a new image to the 'streaming/streaming-service:latest' Docker Hub repository. 5. Monitor the Deployment - Use 'kubectl get pods -l app=streaming-service' to monitor the pod updates during the rolling update process. You will observe that two pods are terminated at a time, while two new with the updated image are created. 6. Check for Successful Update: - Once the deployment is complete, use 'kubectl describe deployment streaming-service-deployment' to see that the 'updatedReplicas' field matches the 'replicas' field, indicating a successful update.
NEW QUESTION # 112
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