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| Section | Weight | Objectives |
|---|---|---|
| Application Observability and Maintenance | 15% | - Utilize container logs - Understand API deprecation policies - Debugging in Kubernetes - Implement probes and health checks - Use built-in CLI tools to monitor Kubernetes applications |
| 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 - Kustomize - Understand Deployments and how to perform rolling updates |
| Application Environment, Configuration and Security | 25% | - SecurityContexts - Understanding and defining resource requirements, limits and quotas - Understand authentication, authorization and admission control - ConfigMaps and Secrets - Discover and use resources that extend Kubernetes (CRD, Operators) - ServiceAccounts |
| Services and Networking | 20% | - Use Ingress rules to expose applications - Provide and troubleshoot access to applications via services - Demonstrate basic understanding of NetworkPolicies |
| Application Design and Build | 20% | - Define, build and modify container images - Utilize persistent and ephemeral volumes - Understand multi-container Pod design patterns (e.g., sidecar, init and others) - Choose and use the right workload resource (Deployment, DaemonSet, CronJob, etc.) |
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NEW QUESTION # 147
You have a statefulset named 'wordpress-statefulset' running a WordPress application, and you're experiencing intermittent issues with the database pod, causing intermittent downtime for the application. Describe the steps you would take to diagnose the issue, including any relevant Kubernetes commands or tools.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Check Pod Logs:
- Use ' kubectl logs -c database' to examine the logs of the database pod- Look for any error messages or warnings that might indicate the cause of the intermittent issues.
2. Check Resource Utilization:
- Use 'kubectl top pods -l app=wordpress-statefulset' to check the CPU and memory usage of the database pod. High resource utilization could indicate a resource constraint issue.
3. Inspect Pod Events:
- Use ' kubectl describe pod to view the events related to the database pod. Look for events like "Back-Off' or "Failed" which could indicate restart attempts or other issues.
4. Check Persistent Volume Claims:
- Use 'kubectl describe pvc to verify the status of the persistent volume claim used by the database pod. If the claim is in an error state, this could be a source of the issue.
5. Examine Node Status:
- Use ' kubectl describe node to check the status of the node where the database pod is running. If the node is experiencing issues or is under high load, it could affect pod stability
6. Check Network Connectivity:
- Verity network connectivity between the database pod and other pods in the statefulset. use tools like 'ping' or 'nc' to test connectivity.
7. Examine Database Configuration:
- If the database pod is using a database like MySQL or PostgreSQL, Check the database configuration files for any potential issues or settings that might be causing the intermittent problems.
8. Check Deployment Strategy:
- Ensure that the statefulset's deployment strategy is appropriate for the application. Consider using a rolling update strategy with a 'maxunavailable' setting to minimize downtime during updates.
9. Debug with Tools:
- Use tools like 'kubectl exec' or 'kubectl port-forward' to access the database pod and run debugging tools or commands directly inside the container. This allows for more in-depth analysis of the issue.
10. Consult Database Logs:
- If the database itself is experiencing issues, access the database logs from within the pod to get more detailed information on errors or performance problems. ,
NEW QUESTION # 148
Refer to Exhibit.
Set Configuration Context:
[student@node-1] $ | kubectl
Config use-context k8s
Context
You sometimes need to observe a pod's logs, and write those logs to a file for further analysis.
Task
Please complete the following;
* Deploy the counter pod to the cluster using the provided YAMLspec file at /opt/KDOB00201/counter.yaml
* Retrieve all currently available application logs from the running pod and store them in the file /opt/KDOB0020l/log_Output.txt, which has already been created
Answer:
Explanation:
Solution:
To deploy the counter pod to the cluster using the provided YAML spec file, you can use the kubectl apply command. The apply command creates and updates resources in a cluster.
kubectl apply -f /opt/KDOB00201/counter.yaml
This command will create the pod in the cluster. You can use the kubectl get pods command to check the status of the pod and ensure that it is running.
kubectl get pods
To retrieve all currently available application logs from the running pod and store them in the file /opt/KDOB0020l/log_Output.txt, you can use the kubectl logs command. The logs command retrieves logs from a container in a pod.
kubectl logs -f <pod-name> > /opt/KDOB0020l/log_Output.txt
Replace <pod-name> with the name of the pod.
You can also use -f option to stream the logs.
kubectl logs -f <pod-name> > /opt/KDOB0020l/log_Output.txt &
This command will retrieve the logs from the pod and write them to the /opt/KDOB0020l/log_Output.txt file.
Please note that the above command will retrieve all logs from the pod, including previous logs. If you want to retrieve only the new logs that are generated after running the command, you can add the --since flag to the kubectl logs command and specify a duration, for example --since=24h for logs generated in the last 24 hours.
Also, please note that, if the pod has multiple containers, you need to specify the container name using -c option.
kubectl logs -f <pod-name> -c <container-name> > /opt/KDOB0020l/log_Output.txt The above command will redirect the logs of the specified container to the file.
NEW QUESTION # 149
Refer to Exhibit.
Context
As a Kubernetes application developer you will often find yourself needing to update a running application.
Task
Please complete the following:
* Update the app deployment in the kdpd00202 namespace with a maxSurge of 5% and a maxUnavailable of 2%
* Perform a rolling update of the web1 deployment, changing the Ifccncf/ngmx image version to 1.13
* Roll back the app deployment to the previous version
Answer:
Explanation:
Solution:
NEW QUESTION # 150
You have a Deployment running a microservice that is responsible for processing user data To ensure the security of this data, you need to implement a NetworkPolicy that restricts network traffic to and from the microservice's pods.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a NetworkP01icy:
- Create a NetworkPolicy YAML file to define the traffic rules:
2. Apply the NetworkPolicy: - Apply tne NetworkPoliCY configuration to your Kubernetes cluster: basn kubectl apply -f restrict-microservice-traffic_yaml 3. Test the NetworkPoIicy: - Create a pod in a different namespace or on a different node. - Attempt to connect to the microservice pod from the new pod. - Verity that the connection is blocked as per the defined NetworkPolicy rules.
NEW QUESTION # 151
You have a Deployment running a web application built With a Node.js container. The application currently uses an older version of the Node.js runtime, and you need to upgrade to a newer versiom Describe the steps involved in modifying the container image to include the new Node.js runtime without rebuilding the entire application.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Dockerfile:
- Create a new 'Dockerfile' With the following content
- Replace With the name of the existing Docker image used by your Deployment. - This Dockefflle uses a multi-stage build approach. It starts with a new Node.js base image and copies the application code from the existing image. This allows you to update the runtime without rebuilding the entire application. 2. Build the New Image: - Build tne image using the Dockerflle: docker build -t updated-image:latest 3. Update the Deployment - Modify your Deployment YAML file to use the newly built image:
4. Apply the Changes: - Apply the updated Deployment using 'kubectl apply -f deployment.yamr. This will trigger a rolling update to the pods using the new image. 5. Verify the Update: - Check the logs of the pods using 'kubectl logs -f ' . You should see the application running with the updated Node.js version. 6. Test the Application: - Access your application and ensure it functions correctly with the new Node.js runtime.
NEW QUESTION # 152
......
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