DENY-All Traffic Network Policy for an Application in a Kubernetes Cluster

Kubernetes: - Security Hardening

1. Why We Need This Use Case

This use case is critical for enhancing security within Kubernetes environments by ensuring that no unauthorized access or unexpected traffic reaches specific applications. It serves as a foundational security measure for applications that require strict traffic control, allowing for a whitelist approach where only explicitly allowed traffic can reach the application.

2. When We Need This Use Case

• Security Hardening: When starting to implement network security policies within a cluster to adopt a default deny stance for better security.

• Isolation for Sensitive Workloads: For applications handling sensitive data where unauthorized access could lead to data breaches or other security incidents.

• Development and Testing: When deploying new applications or services that should not yet be exposed to other cluster traffic.

• Incident Response: Temporarily isolating an application if it is suspected to be compromised or behaving unexpectedly.

3. Prerequisites for the Lab