Kubernetes simplifies container orchestration, but improperly secured clusters present massive attack surfaces. Securing cloud-native K8s requires defense-in-depth across build, deployment, and runtime phases.
1. Cluster Admission Control
Use OPA (Open Policy Agent) or Kyverno to enforce strict policies: reject containers running as root, enforce read-only root filesystems, and mandate container image signature verification.
2. Runtime Security with eBPF
Traditional host security agents struggle with ephemeral containers. eBPF (Extended Berkeley Packet Filter) technology inspects Linux kernel events directly, allowing tools like Falco to detect suspicious process execution or unexpected outbound socket connections in real time without performance overhead.
Key Takeaways
- Enforce least-privilege Pod Security Standards across all namespaces.
- Sign container images and verify signatures prior to deployment.
- Use eBPF kernel monitoring for real-time zero-day runtime threat detection.