See the solution below.
Explanation
solution
F:\Work\Data Entry Work\Data Entry\20200827\CKA\7 B.JPG

F:\Work\Data Entry Work\Data Entry\20200827\CKA\7 C.JPG

F:\Work\Data Entry Work\Data Entry\20200827\CKA\7 D.JPG

Solution:
sudo -i
systemctl status kubelet
systemctl start kubelet
systemctl enable kubelet

See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
Step 1: Create a ClusterRole to deny pod creation in the 'default' namespace.

Step 2: Create a ClusterRoleBinding to apply the ClusterRole to all users.

We create a ClusterRole that specifically targets the 'default' namespace and denies 'create' permissions for pods. This ClusterRole uses 'resourceNames' and 'namespaceSelector& to precisely target the 'default' namespace. We create a ClusterRoleBinding that applies the ClusterRole to all users in the cluster. Applying the configurations: Use 'kubectl apply -f [filename].yaml' to apply the ClusterRole and ClusterRoleBinding YAML files. This will prevent anyone from creating pods in the 'default' namespace. This configuration is a powerful way to implement security policies and prevent unintended resource creation in sensitive namespaces. ,

See the solution below with Step by Step Explanation.

See the solution below with Step by Step Explanation.
Explanation:
Create the necessary RBAC roles, role bindings, and service accounts to enable these permissions.
Solution (Step by Step) :
1 . Create Service Accounts:
kubectl create serviceaccount frontend-sa -n default
kubectl create serviceaccount backend-sa -n default
kubectl create serviceaccount worker-sa -n worker-namespace
2. Create Roles:


3. Create Role Bindings: kubectl create rolebinding frontend-binding -n default -role=frontend-role serviceaccount=default:frontend-sa kubectl create rolebinding backend-binding -n default --role=backend-role - serviceaccount=default:backend-sa kubectl create rolebinding worker-binding -n worker-namespace -role=worker-role - serviceaccount=worker- namespace:worker-sa 4. Grant Access to Services: Frontend: The 'frontend' service account should have access to the 'nginx-ingress-controller' deployment. This can be done through a Role or ClusterRole and RoleBinding or ClusterRoleBinding, depending on if the controller is in the same namespace or across namespaces. Backend: The 'backend' service account should have read-only access to the postgres' service. This can be achieved by creating a 'ServiceAccount' for the 'backend' service and binding it to a 'Role' that grants the necessary permissions on the 'postgres' service. Worker: The 'worker' service account should have full access (create, update, delete) to pods in the 'worker- namespace' and read access to the 'redis' service. Important Notes: - The provided 'kubectl' commands are illustrative. You may need to adjust them based on your specific cluster configuration. - The above RBAC configuration is a basic example. Depending on the specific needs of your application, you may need to configure more granular roles and bindings.