Google Cloud Organization Policy vs Kyverno

Google Cloud Organization Policy lets administrators set constraints on Google Cloud resources across organizations, folders, and projects. Descendant resources inherit policies by default, so teams can establish restrictions across a resource hierarchy. Examples include limiting resource sharing by domain, restricting IAM service account use, and limiting where new resources may be created. Organizations can define custom constraints for resource creation and updates. Policies can be managed in the Google Cloud console, CLI, or REST API; the API exposes policy and constraint resources at organization, folder, and project levels. Dry-run policies record violations in audit logs without blocking the action, while Policy Intelligence tools can test proposed changes, identify non-compliant resources, monitor workflow impact, and show policy coverage. The service is free, with the Organization Policy Service API listed at free. Policies use YAML and JSON. Changes can take up to 15 minutes to take effect, and most enforcement is not retroactive. Basic Support is included for Google Cloud customers; paid technical support tiers are also available.

Kyverno is a free, open-source policy engine for defining and enforcing policy as code in Kubernetes. Its stable policy types can validate, mutate, generate or delete resources, and verify container image signatures and attestations. The Kyverno CLI can test policies against Kubernetes resource manifests in CI before they are applied to a live cluster. Documentation describes use with Helm, YAML manifests, GitHub Actions and GitOps tools such as ArgoCD. Kyverno is installed in a Kubernetes cluster; Helm is recommended for production, and YAML manifests are also available. A standard installation requires an admission controller, while background, reports and cleanup controllers are optional. Production installations should use high availability mode. The project supports CEL-based policy types and describes applying Kubernetes-style policies outside Kubernetes as part of its mission. Its webhooks default to fail-closed, so matching requests can fail if the API server cannot reach Kyverno. The project documents Cosign signatures for images and manifests, and lists CLI binaries for Linux, macOS and Windows.