First Kyverno Policy

K8s-native policy.

Overview

Kyverno is the Kubernetes-native admission controller that uses YAML rather than Rego. The first policy moves cluster governance from theory to enforced practice. Validate, mutate, and generate policies cover most needs; built-in Pod Security Standards policies provide a sensible starting baseline; audit mode lets policies prove themselves before they block production.

• Kubernetes-native YAML policy. Policy in YAML alongside the workloads it governs. No separate language to learn.
• Validate, mutate, generate. Three policy types: block bad resources, inject defaults, generate companion resources.
• Built-in policy library. Pod Security Standards as Kyverno policies. Industry baselines without writing them from scratch.
• Audit and enforce modes plus image verification. Audit before enforce for safe rollout; Cosign-based image signature verification covers supply-chain controls.

The approach

Three habits make Kyverno produce real governance: install via Helm, audit mode first to validate the policy against existing workloads, enforce after the audit data is clean.

• helm install kyverno. Standard install. Repeatable across clusters.
• ClusterPolicy CRD. Defines validation rules in YAML. Declarative governance.
• Audit mode first. Test policy without blocking. Catches false positives against existing workloads before enforcement bites.
• Enforce after validation plus documented rationale. Switch to enforce after audit is clean; per-policy the rationale documented.

Why this compounds

Each enforced policy improves the cluster’s baseline posture. The team’s governance fluency deepens; new policies extend the framework instead of recreating it; auditor questions get cleaner answers.

• Security improves. Enforced policies prevent misconfigured workloads from reaching the cluster.
• Compliance posture sharpens. Kyverno policies map to SOC 2, PCI, and HIPAA controls. Auditors see the evidence.
• Reusable patterns. Standard policy templates capture team practices across clusters.
• Year-one investment, year-two habit. First policy is investment. By the third, audit-then-enforce is routine.