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| Section | Objectives |
|---|---|
| Topic 1: Application Design and Build | - Define, build and modify container images - Understand multi-container Pod design patterns - Understand Jobs and CronJobs |
| Topic 2: Application Observability and Maintenance | - Understand probes and health checks - Monitor and troubleshoot applications |
| Topic 3: State Persistence | - Storage classes and volume mounting - PersistentVolumes and PersistentVolumeClaims |
| Topic 4: Services and Networking | - Services (ClusterIP, NodePort) - Pod networking concepts - Ingress basics |
| Topic 5: Application Environment, Configuration and Security | - ConfigMaps and Secrets usage - Security contexts and service accounts |
| Topic 6: Application Deployment | - Understand rolling updates and rollbacks - Use Kubernetes primitives to implement deployments |
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NEW QUESTION # 83 
Context
It is always useful to look at the resources your applications are consuming in a cluster.
Task
* From the pods running in namespace cpu-stress , write the name only of the pod that is consuming the most CPU to file /opt/KDOBG030l/pod.txt, which has already been created.
Answer:
Explanation:
See the solution below.
Explanation
Solution:
NEW QUESTION # 84
You are building a Kubernetes application tnat requires persistent storage for its dat a. The application needs to be able to access the data even if the pod is restarted or deleted. You have a PersistentVolumeClaim (PVC) defined for this purpose.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a PersistentVolume (PV):
- Define a PV with a suitable storage class, access modes (ReadWriteOnce), and a capacity that meets your application's storage requirements.
- Example:
2. Create a PersistentVolumeClaim (PVC): - Define a PVC with the desired storage class and access modes. - Specify the desired storage capacity. - Example:
3. Create a Deployment With the PVC: - In the Deployment YAML, define a volume mount that uses the PVC you created_ - Specify the volume mount path within the container. - Example:
4. Create the Deployment: - Apply the Deployment YAML using 'kubectl apply -f my-app-deployment.yamr 5. Verify the Deployment - Check the status of the Deployment using 'kubectl get deployments my-app' - Verify that the Pod is running and using the PersistentVolumeClaim. - You can also check the pod's logs for confirmation that the data is stored in the mounted volume.
NEW QUESTION # 85
You have a Deployment named 'web-app-deployments that runs a web application in a containerized environment. The application is designed for high availability and scalability, but you need to ensure that no more than two pods are ever terminated simultaneously during a rolling update process. This is to minimize the impact on service availability during the update. How would you implement this rolling update strategy using Deployment resources?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Update the Deployment YAML:
- Modify the 'strategy.roIIinglJpdate' section of the Deployment YAML to configure the rolling update behavior.
- Set 'maxunavailable: 1 ' to allow only one pod to be unavailable at a time during the update.
- Set 'maxSurge: 1 ' to permit only one additional pod to be created beyond the desired replica count during the update.
2. Apply the Updated Deployment: - Use ' kubectl apply -f web-app-deployment-yamr to update the Deployment. 3. Monitor the Rolling Update: - Observe the pod updates using 'kubectl get pods -I app=web-app' - You will see that during the rolling update, only one pod is terminated, while one new pod is created, ensuring that no more than two pods are ever terminated at the same time. 4. Verify the Update: - Once the rolling update is complete, check the 'updatedReplicaS field in the Deployment description Ckubectl describe deployment web-app- deployment) to verify that it matches the 'replicas' field.
NEW QUESTION # 86
You have a Deployment named 'wordpress-deployment' that runs 3 replicas of a Wordpress container with the image 'wordpress:latest You need to ensure that wnen a new image is pusned to the Docker Hub repository 'my-wordpress-repo/wordpressaatest' , tne Deployment automatically updates to use the new image. Additionally, you need to set up a rolling update strategy where only one pod is updated at a time- The maximum number of unavailable pods at any given time should be 1.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Update the Deployment YAML.
- Add 'imagePuIIPoIicy: Always' to the container definition to ensure the deployment pulls the latest image from the Docker Hub repository even if a local copy exists.
- Set 'strategy-type: Rollingupdate' to enable a rolling update strategy.
- Configure 'strategy.rollingupdate.maxonavailable: I ' to allow only one pod to be unavailable during the update process.
- Set 'strategy-rollingUpdate.maxSurge: O' to restrict the number of pods added during the update to zero.
NEW QUESTION # 87
You are running a critical application on Kubernetes, and your security team has mandated the use of Pod Security Policies (PSPs) to enhance the security posture of your cluster. You have a Deployment that uses a privileged container for certain tasks. However, PSPs restrict the use of privileged containers. Describe how you can address this challenge while adhering to the security requirements imposed by PSPs.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Identify the Privileged Container Tasks: Analyze your Deployment and identify the specific tasks performed by the privileged container. These tasks might involve accessing host resources like devices, manipulating network settings, or interacting with the host kernel directly.
2. Explore Alternative Solutions: Instead of relying on privileged containers, consider alternative approaches to achieve the desired functionality:
- Host Network: If the task requires direct network access, consider using the 'hostNetwork' feature. This grants the container access to the host's network stack but doesn't require privileged mode.
- HostPath Volumes: If the task involves accessing host files or directories, mount them into the container using 'hostPath' volumes.
- SecurityContext: Explore the 'securityContext' options for containers. Options like 'capabilities' can grant limited access to specific host resources.
- Dedicated Service Account: Assign a dedicated Service Account to the Deployment with limited permissions, ensuring the container can only access the required resources.
3. Implement PSP with Allowlist:
- Create a PSP that defines a restricted set of security rules. This PSP should allow:
- The specific tasks that require privileged operations.
- Other essential security measures like restricting host network access, SELinux, and AppArmor configurations.
- Apply the PSP to the namespace where your Deployment is running.
4. Update Deployment: Modify your Deployment configuration to utilize the alternative solutions identified in step 2.
- Replace the privileged container with a non-privileged container.
- Utilize 'hostNetwork', 'hostPatW volumes, or 'securityContext' options as needed.
- Ensure the Deployment is properly configured to use the dedicated Service Account.
5. Test and Validate: Verify that the modified Deployment functions as expected and that the chosen alternative solutions meet the original requirements. Additionally, ensure that the PSP is enforcing the desired security policies.
Example:
Original Deployment (with privileged container):
Modified Deployment (using host network):
PSP with allowlist:
Note: This example illustrates one approach to address the challenge. The specific solution will depend on the nature of the privileged container tasks and the security requirements enforced by your PSP. It's essential to thoroughly understand your application's needs and implement the appropriate security measures to ensure both security and functionality. ,
NEW QUESTION # 88
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