Zero Trust has become a vendor category, which is unfortunate, because on Kubernetes it is a concrete set of engineering decisions. The core principle is simple: no implicit trust based on network location. Every request is authenticated, authorized and encrypted — every time.
Start with identity. Workload identity in Kubernetes should be tied to cloud IAM, not to long-lived secrets. Use IRSA on EKS or Workload Identity on AKS so pods authenticate as themselves, with scoped roles and short-lived credentials. Eliminate static keys from your clusters entirely.
Then network. Default-deny network policies are the baseline, not the goal. Use a CNI that enforces policies at the pod level and consider a service mesh for mTLS when east-west encryption is a compliance requirement. Segment by sensitivity, not by namespace — a namespace is an administrative boundary, not a trust boundary.
Finally, runtime and posture. Continuous image scanning, admission control with OPA or Kyverno, and runtime threat detection close the loop. Zero Trust is not a checkpoint — it is a posture you maintain continuously, and automation is the only thing that keeps it honest at scale.
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