Flatcar inter-operation matrix

August 12, 2026 ยท View on GitHub

This document tracks Flatcar inter-operability across environments.

Ownership of an item implies ensuring test coverage in release tests of official Flatcar releases (L2 and above) as well as handling bugs and feature requests that affect the respective environment specifically. Please propose ownership by filing a PR for this document.

Public cloud (machines)

EnvironmentFull-Feature (release blocker)WorksTested (CI)OwnerReference (e.g. GH issue)Notes
EC2PartialXX@flatcar/flatcar-maintainersIAM 2.0 support missing
AzureXXX@flatcar/flatcar-maintainers
GCEXXX@flatcar/flatcar-maintainers
DigitalOcean (VMs)XXX@flatcar/flatcar-maintainers
Equinix MetalXXX@flatcar/flatcar-maintainers
VMware ESXi / VMware vSphereXXX@flatcar/flatcar-maintainers
Hetzner CloudX[no owner]
Vultr VPSX[no owner]
cloudscale.chX[no owner]
Oracle CloudX[no owner]Bring-your-own-image on OCI VMs; install via Ubuntu on OCI bare metal
Tencent[no owner]
Alibaba Cloud[no owner]
Yandex[no owner]
BrightboxXXX@flatcar/flatcar-maintainers

Private Cloud (machines)

EnvironmentFull-Feature (release blocker)WorksTested (CI)OwnerReference (e.g. GH issue)Notes
Azure Stackw/ caveat[no owner]controller node not supported on Flatcar (cloud-init feature missing)
TinkerbellX[no owner]
Rancher (VMs)X[no owner]
QEMU / KVM backedXXX@flatcar/flatcar-maintainers
OpenStackXXX@flatcar/flatcar-maintainers
VirtualBoxX[no owner]
VagrantX[no owner]Isn't this plain QEMU/KVM?

Managed Kubernetes

EnvironmentFull-Feature (release blocker)WorksTested (CI)OwnerReference (e.g. GH issue)Notes
EKSX[no owner]
Giant SwarmXProvider

Cluster API

EnvironmentFull-Feature (release blocker)WorksTested (CI)OwnerReference (e.g. GH issue)Notes
CAPBXXX (upstream)UpstreamCovered by CAPB release tests
CAPAXXX (upstream)UpstreamCovered by CAPA release tests
CAPA EKS[no owner]
CAPZw/ caveat@flatcar/flatcar-maintainersWIP Prototype
CAPV[no owner]
CAPM3[no owner]
CAPG[no owner]
CAPOXX (upstream)Upstream

Kubernetes Distros

EnvironmentFull-Feature (release blocker)WorksTested (CI)OwnerReference (e.g. GH issue)Notes
AKS EngineX[no owner]https://kinvolk.io/blog/2020/12/aks-engine-on-flatcar
Rancher (RKE)X[no owner]
Rancher (RKE2)[no owner]
Tanzu Kubernetes Grid (TKG)X[no owner]
K3sX[no owner]
Amazon EKS DistroX[no owner]
kOpsXUpstream
KubermaticX[no owner]
GardenerX[no owner]

Other

Please add below what does not fit into any of the categories above.

EnvironmentFull-Feature (release blocker)WorksTested (CI)OwnerReference (e.g. GH issue)Notes