Kubernetes - Enabling Cross-Namespace Traffic to a Centralized Service

When multiple applications across different namespaces need to access a common resource like a database

1. Why We Need This Use Case

This use case is vital for organizations that deploy common services or shared databases across multiple namespaces within a Kubernetes cluster. By implementing a network policy that allows traffic from all namespaces, services such as centralized logging, monitoring, or shared databases can securely receive traffic from different parts of the cluster, facilitating better integration and resource utilization.

2. When We Need This Use Case

• Centralized Services: For services that must be accessible by all deployments regardless of namespace, such as monitoring tools or shared APIs.

• Shared Resources: When multiple applications across different namespaces need to access a common resource like a database.

• Service Mesh Architectures: In complex architectures where services across various namespaces must communicate seamlessly.

• Development and Testing: Allows services in a development namespace to access production APIs or databases for testing purposes without disrupting the production environment.

3. Prerequisites for the Lab