kube-spawn supports rktlet, the rkt implementation of the Kubernetes Container Runtime Interface: https://github.com/kubernetes-incubator/rktlet)
To use rkt as the container runtime, set --container-runtime=rkt with the
create command. rkt and rktlet must be available on the host.
Example:
sudo ./kube-spawn create --container-runtime rkt --rktlet-binary-path ~/code/go/src/github.com/kubernetes-incubator/rktlet/bin/rktlet -c rktcluster
sudo ./kube-spawn start -c rktcluster -n 5
...
export KUBECONFIG=/var/lib/kube-spawn/clusters/rktcluster/admin.kubeconfig
kubectl get nodes -o wide
NAME STATUS ROLES AGE VERSION EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
kube-spawn-rktcluster-master-yomfri Ready master 1m v1.9.6 <none> Flatcar Linux by Kinvolk 1729.0.0 (Rhyolite) 4.15.0-2-amd64 rkt://0.1.0
kube-spawn-rktcluster-worker-4u9fsu Ready <none> 41s v1.9.6 <none> Flatcar Linux by Kinvolk 1729.0.0 (Rhyolite) 4.15.0-2-amd64 rkt://0.1.0
kube-spawn-rktcluster-worker-mysslr Ready <none> 41s v1.9.6 <none> Flatcar Linux by Kinvolk 1729.0.0 (Rhyolite) 4.15.0-2-amd64 rkt://0.1.0
kube-spawn-rktcluster-worker-ogrm8l Ready <none> 40s v1.9.6 <none> Flatcar Linux by Kinvolk 1729.0.0 (Rhyolite) 4.15.0-2-amd64 rkt://0.1.0
kube-spawn-rktcluster-worker-yxspu2 Ready <none> 41s v1.9.6 <none> Flatcar Linux by Kinvolk 1729.0.0 (Rhyolite) 4.15.0-2-amd64 rkt://0.1.0
--rkt-binary-path and --rkt-stage1-image-path can be used to specify
non-default location for the rkt / stage1 binaries.
NB: rktlet doesn't support Kubernetes 1.10 at the time of writing, see kubernetes-retired/rktlet#183