Supported Distributions

UDS Core runs on any CNCF-conformant Kubernetes distribution that has not reached End-of-Life. The following are actively tested in CI:

Note

UDS Core tests EKS, AKS, and RKE2 against Kubernetes 1.36. The target is typically n-1 (one minor version behind the latest release, latest patch). This version may lag slightly behind new Kubernetes releases.

Distribution	K8s Version	Status	Testing Schedule
K3s / k3d	1.35, 1.36, 1.37		Nightly, on demand, and when pull requests change the compatibility workflow
Amazon EKS	1.36		Weekly and before each release
Azure AKS	1.36		Weekly and before each release
RKE2 (on AWS)	1.36		Weekly and before each release

Note

Amazon EKS CI currently uses a non-FIPS Bottlerocket AMI and does not validate FIPS node operating system compatibility. This temporary coverage gap avoids the registry1 Bottlerocket FIPS compatibility issue.

Note

Unlisted CNCF-conformant distributions are expected to work but are not validated in CI. Bug reports and contributions for compatibility issues are welcome.

Regular pull request tests use the default K3s version in the setup task. The Kubernetes compatibility workflow tests exact K3s releases. This workflow does not define the UDS Core support policy. Kubernetes release support is tracked by the Kubernetes release calendar.