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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Cluster Architecture, Installation & Configuration | 25% | - Cluster installation and configuration - High availability setup - Kubernetes architecture components |
| Topic 2: Storage | 10% | - Storage classes - PersistentVolumes and PersistentVolumeClaims |
| Topic 3: Troubleshooting | 30% | - Application and networking debugging - Cluster component troubleshooting |
| Topic 4: Workloads & Scheduling | 15% | - ConfigMaps and Secrets - Scheduling constraints - Deployments and rolling updates |
| Topic 5: Services & Networking | 20% | - Network policies - Ingress configuration - Services (ClusterIP, NodePort, LoadBalancer) |
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NEW QUESTION # 13
Create a pod that echo "hello world" and then exists. Have the pod deleted automatically when it's completed See the solution below.
Answer:
Explanation:
kubectl run busybox --image=busybox -it --rm --restart=Never --
/bin/sh -c 'echo hello world'
kubectl get po # You shouldn't see pod with the name "busybox"
NEW QUESTION # 14
Create an nginx pod and load environment values from the above configmap "keyvalcfgmap" and exec into the pod and verify the environment variables and delete the pod
Answer: A
NEW QUESTION # 15
You are managing a Kubernetes cluster where several pods are scheduled across multiple nodes. One of your deployments (named "wordpress") is using a custom resource definition (CRD) called "WordpressConfig" that defines the configuration for the Wordpress application. The "WordpressConfig" CRD includes parameters for database connections, security settings, and other application-specific settings. You want to ensure that the pods running the WordPress application are aware of the latest configuration changes to the "WordpressConfig" CRD, even if the pod is already running.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a ConfigMap:
- Define a ConfigMap named "wordpress-config" that will contain the current configuration from the
"WordpressConfig" CRD.
- Use the 'kubectl get wordpressconfig -o yaml' command to get the current configuration of the
"WordpressConfig" resource.
- Update the ConfigMap with the desired configuration data. You can achieve this by:
- Manually creating a ConfigMap with the configuration data.
- Creating a separate script or function to extract data from the "WordpressConfig" CRD and apply it to a ConfigMap.
- You can use the following YAML snippet as an example for the "wordpress-config" ConfigMap:
2. Update the Wordpress Deployment: - Modify the 'wordpress' Deployment to use the "wordpress-config" ConfigMap as a volume. - Mount the volume to the pod's container and ensure the application can access the configuration from the volume. - Update the Deployment YAML as follows:
3. Implement a Controller: - Create a custom controller that watches for changes in the "WordpressConfig" CRD. - When a change occurs, the controller should update the "wordpress-config" ConfigMap with the new configuration data. - This ensures that the ConfigMap stays in sync with the "WordpressConfig" resource. - The controller can be written using various languages like Go, Python, or Java. 4. Configure Pod Updates: - If your WordPress pods are not automatically restarted after the ConfigMap changes, you can trigger a restart using the 'kubectl rollout restart deployment wordpress' command. - Alternatively, you can set the 'imagePullPolicy' to in your Deployment configuration, which forces the pods to pull the new image and re-apply the configuration on each update. 5. Verify the Configuration: - Once you have implemented these steps, verify that the Wordpress pods are using the latest configuration from the ConfigMap. - Use the 'kubectl get pods -l app=wordpress -o yamp command to inspect the running pods and verify the volume mount and the path where the configuration data is located. - Access the running WordPress application to confirm that the new configuration is being applied. By following these steps, you will ensure that your Wordpress pods are always using the latest configuration from the "WordpressConfig" CRD, regardless of whether the pods are already running or not. ,
NEW QUESTION # 16
Create a redis pod and mount "redis-config" as "redis.conf"
inside redis container, name the config volume as "redis-volume"
redis-config path - /opt/redis-config
Answer: B
NEW QUESTION # 17
Your team has deployed a containerized application on Kubernetes. You have configured a deployment with a replica count of 3 pods. The application uses a resource-intensive process that consumes a significant amount of CPU resources. You are experiencing performance issues and suspect that the pods are competing for resources. Explain how you can use resource quotas and limits to address this problem.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define Resource Limits for Pods:
- Modify the deployment configuration to set resource limits for each pod, specifying the maximum CPU and memory resources they can consume. This prevents pods from exceeding their resource allocations, ensuring fairer resource distribution.
2. Implement Resource Quotas at the Namespace Level: - Define resource quotas for the namespace where your application is running. This limits the overall resource consumption within the namespace, preventing any single pod from monopolizing resources.
3. Monitor Resource Usage and Adjust Limits: - Continuously monitor the resource usage of your pods and the namespace. Analyze the CPU and memory utilization to identify any resource contention. - Adjust resource limits and quotas as needed to fine-tune the resource allocation and improve performance.
NEW QUESTION # 18
......
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