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Kubernetes Namespace Visibility: Building a CRD for Multi-Tenant Clusters
In multi-tenant Kubernetes environments, maintaining network isolation between namespaces is crucial for security and compliance. Yet, it’s surprisingly easy to overlook network policies that accidentally expose one namespace to another, putting data at risk.
As organizations scale their clusters, namespace isolation challenges become more important. Even well-configured policies can sometimes expose sensitive services. The risk is real, and the consequences can be significant.
In this article, we’ll walk through building a Custom Resource Definition (CRD) that detects namespace visibility issues. We’ll also cover practical examples, including how to deploy the CRD, a custom controller for a use case.
Why Namespace Isolation Matters in Multi-Tenant Clusters
Understanding Multi-Tenant Kubernetes
Multi-tenancy in Kubernetes refers to running multiple workloads or applications from different teams or projects on a shared cluster. In such setups, isolating workloads is vital to prevent:
- Data Leakage: One tenant accessing another tenant’s data.
- Performance Issues: Resource exhaustion caused by a noisy neighbor.
