See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1 . Create a ServiceAccount for the team:

2. Create a ClusterRole for the team:

3. Create a ClusterRoleBinding that binds the ClusterRole to the ServiceAccount and restricts access to a specific namespace:

4. Replace 'team-sa', 'team-namespace', and 'team-clusterrole' with the actual names. 5. Test the configuration by creating a deployment as the ServiceAccount in the assigned namespace and verifying that you can't access resources in other namespaces.

See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the Service:
- Create a Service of type "LoadBalancer" for your Nginx service.
- Include the sessionAffinity' field with a value of 'ClientlP' to enable client IP-based session affinity.
- Example:

2. Configure the Deployment: - In your Nginx Deployment, define a liveness probe and readiness probe to check the health of your Nginx containers. - Example:

3. Implement the Custom Header: - Configure an Ingress resource with the nginx.ingress.kubernetes.io/add-request-headeo annotation. - Example:

4. Apply the Configurations: - Apply the updated Service, Deployment, and Ingress resources using 'kubectl apply -f service.yaml -f deployment.yaml -f ingress.yamr. 5. Verify the Load Balancer: - Access the Nginx service using the external IP address provided by the LoadBalancer. - Verify session affinity by making multiple requests and observing that they are consistently routed to the same pod. - Check the "X-App-Version" header in the responses to confirm that it is set to "vl .0".

See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1 . Create a NetworkPolicy for the Application Pods:
- Define a NetworkPolicy rule that allows ingress traffic from the application pods to the external service. This policy should be applied to the namespace where the application pods are running.

2. Configure Network Access to the External Service: - Ensure that the external service is accessible from the cluster network. This might involve using a dedicated load balancer, a service proxy, or a network tunnel. 3. Implement a Service for the External Service: - Create a Kubernetes Service to represent the external service and expose it within the cluster. This service can be a headless service, which doesn't provide a public endpoint, as the external service is only accessible from the cluster network.

4. Verify Network Policy Configuration: - Verify that the NetworkPolicy is applied correctly and that the application pods can access the external service. Use 'kubectl get networkpolicies myapp-networkpolicy' to check the policy status and 'kubectl describe pod myapp-XXXX' (where XXXX is a pod name) to check the pod's network configuration.

Solution:
#vi pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: app-config
spec:
capacity:
storage: 1Gi
accessModes:
- ReadOnlyMany
hostPath:
path: /srv/app-config
#
kubectl create -f pv.yaml