Explain the concept of "volume mode" for PersistentVolumes and how it differs between "Block" and "Filesystem" mode. Provide examples of when each mode would be most suitable.

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Create a pod as follows:
* Name: non-persistent-redis
* container Image: redis
* Volume with name: cache-control
* Mount path: /data/redis
The pod should launch in the staging namespace and the volume must not be persistent.

Correct Answer:

See the solution below.
Explanation
solution

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Score:7%

Context
An existing Pod needs to be integrated into the Kubernetes built-in logging architecture (e. g. kubectl logs). Adding a streaming sidecar container is a good and common way to accomplish this requirement.
Task
Add a sidecar container named sidecar, using the busybox Image, to the existing Pod big-corp-app. The new sidecar container has to run the following command:
/bin/sh -c tail -n+1 -f /va r/log/big-corp-app.log
Use a Volume, mounted at /var/log, to make the log file big-corp-app.log available to the sidecar container.

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For this item, you will have to ssh to the nodes ik8s-master-0 and ik8s-node-0 and complete all tasks on these nodes. Ensure that you return to the base node (hostname: node-1) when you have completed this item.
Context
As an administrator of a small development team, you have been asked to set up a Kubernetes cluster to test the viability of a new application.
Task You must use kubeadm to perform this task. Any kubeadm invocations will require the use of the --ignore-preflight-errors=all option.
Configure the node ik8s-master-O as a master node. .
Join the node ik8s-node-o to the cluster.

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You have a Deployment named 'my-app' running a web application with three replicas. The application is exposed using a 'LoadBalancer' service. You want to create a 'ClusterlP' service for internal communication within the Kubernetes cluster and route traffic from the 'LoadBalancer' service to the 'ClusterlP' service.

Correct Answer:

See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1 . Create the ClusterlP service:
- Define a 'ClusterlP' service that points to the my-app' Deployment.

2. Create the LoadBalancer service: - Define a 'LoadBalancer service that routes traffic to the my-app-internar service.

3. Apply the Service YAMLs: - Apply the YAML files for both services using 'kubectl apply -f my-app-internal.yamP and 'kubectl apply -f my- app-external.yamr. 4. Verify the Services: - Check the status of both services using 'kubectl get services'. You should see the 'my-app-internal' service with a 'ClusterlP' and the my-app-external' service with an external IP address. 5. Test the Routing: - Access the application through the external IP address of the 'my-app-external' service. The traffic should be routed to the 'my-app-internal' service and then to the my-app' Deployment. Note: Replace with the actual namespace where your Deployment and Services are located.

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