From intent to enforcement: Lessons from operating Kubernetes controllers at scale
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Deep technical lessons on K8s controllers, highly actionable for platform engineers.
Summary
Kubernetes controllers at scale face correctness challenges from cache staleness and object churn. Amazon EKS's Network Policy Controller centralizes label-to-IP resolution for eBPF enforcement, while the VPC Resource Controller assigns individual AWS security groups to pods, avoiding node-level inheritance that would leak access. These patterns preserve intent as clusters grow to thousands of nodes.
Author
Sri Saran Balaji Vellore Rajakumar, Jayanth Varavani
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