Kubernetes is pay for hosting in the case of Google Container Engine, and pay for hosting + support in case of RedHat OpenShift Origin (which leverages Kubernetes).  Docker Datacenter appears to be pay for support based off their pricing page at <a href="https:&#x2F;&#x2F;www.docker.com&#x2F;pricing" rel="nofollow">https:&#x2F;&#x2F;www.docker.com&#x2F;pricing</a> (which just says call for quote basically).