k0rdent Child Clusters Pass CNCF Kubernetes v1.35 Conformance Testing

Bharath Nallapeta - May 07, 2026

- AI, enterprise Kubernetes, k0rdent, k0s, Kubernetes

Clusters deployed and lifecycle-managed by k0rdent have passed the CNCF Kubernetes v1.35 conformance tests and are now Certified Kubernetes. The results were merged into the cncf/k8s-conformance repository, and k0rdent is officially listed under the Certified Kubernetes distributions category in the CNCF landscape.

This means Kubernetes clusters created and managed by k0rdent have passed the standard conformance tests used across the ecosystem and behave in line with upstream Kubernetes expectations.

What was certified

The Kubernetes Conformance Program, maintained by the CNCF, defines a required baseline for Kubernetes distributions, hosted platforms, and installers. Certification validates that a tested Kubernetes environment supports the required Kubernetes API surface and core behaviors, including workload lifecycle, networking and services, storage primitives, and RBAC/API access.

The tests are run with Sonobuoy and submitted publicly. To be certified, all mandatory tests must pass without modification. Once reviewed and merged into the upstream conformance repository, the tested distribution, hosted platform, or installer is included in the list of Certified Kubernetes platforms.

For k0rdent, the important point is that certification applies to the Kubernetes clusters k0rdent deploys and lifecycle-manages. k0rdent itself is a Kubernetes-native control plane for provisioning and managing clusters across environments; it is not itself “a Kubernetes.”

Why it matters

For teams evaluating k0rdent, certification provides an independently verifiable baseline. The submitted results, including Sonobuoy output and Kubernetes version, are available in the upstream repository.

That matters because clusters created by k0rdent need to behave like standard Kubernetes clusters. Passing the conformance suite verifies that those clusters expose the required APIs and behaviors without deviation.

This is also consistent with how k0rdent is developed and operated:

The codebase is open
The conformance results are public
Cluster behavior is validated against upstream Kubernetes

Thanks to the contributors and maintainers who helped get the project to the point where clusters deployed by k0rdent could pass conformance cleanly, and to the CNCF conformance reviewers for processing the submission.

What’s next

The next area of focus for k0rdent is the CNCF Kubernetes AI Conformance Program, which extends validation to AI-specific workloads, including GPU scheduling, distributed training workloads, and accelerator integration.