Exam CKS Topic 4 Question 1 Discussion

Solution (Step by Step) :
1. Use Network Policies: Define network policies at the namespace level to control communication between pods. Each namespace will have its own
set of policies.
- Example Network Policy (Namespace A):

2. Enable Pod Security Policies (PSPsy PSPs allow you to define security constraints for pods running in your cluster. You can restrict the use of specific resources, capabilities, and network access. - Example PSP:

3. Isolate Resources: Ensure resources are not shared between namespaces, such as storage (persistent volumes) and configuration (config maps, secrets). - Example: Create separate persistent volumes and claims for each namespace. 4. Monitoring and Auditing: Implement monitoring and auditing tools to detect any unauthorized access attempts or violations of your isolation policy. 5. Potential Risks of Insufficient Isolation: - Data Breaches: Data in one namespace could be compromised by applications in another namespace, leading to a data leak. - Denial of Service: Applications in one namespace could consume all available resources, impacting the performance of applications in other namespaces. - Privilege Escalation: An application in one namespace could gain elevated privileges and access resources in other namespaces.