Implementing a Default DENY All Egress Traffic Network Policy in a Kubernetes Namespace
Maintaining strict control over network traffic leaving a Kubernetes namespace
1. Why We Need This Use Case
This use case is essential for maintaining strict control over network traffic leaving a Kubernetes namespace. By default, denying all egress traffic ensures that no unauthorized data leaves the namespace and that any external communication is explicitly allowed through additional network policies. This approach is critical for securing sensitive applications and services, ensuring that dependencies are clearly defined and managed.
2. When We Need This Use Case
Security and Isolation: When the goal is to secure and isolate workloads within a namespace to prevent data leakage or unauthorized access to external resources.
Compliance and Audit: In environments where compliance with regulatory standards requires strict control over all data egress.
Dependency Management: To help identify and manage dependencies within applications by explicitly defining which services can communicate externally.
Reduction of Attack Surface: Minimizing the attack surface by preventing pods from initiating potentially risky connections.
3. Prerequisites for the Lab
Kubernetes Cluster: Access to manage resources within a Kubernetes cluster.
kubectl Command Line Tool: Configured for administrative tasks within the cluster.
Understanding of Kubernetes Networking: Familiarity with how Kubernetes handles networking, particularly with network policies.
Namespace Setup: A namespace where the policy will be applied, excluding kube-system or other critical namespaces.
