`api_servers` | (Optional) The IP address / host name where a kubelet can get read-only access to kube-apiserver
`cbr-cidr` | (Optional) The minion IP address range used for the docker container bridge.
`cloud` | (Optional) Which IaaS platform is used to host kubernetes, *gce*, *azure*, *aws*, *vagrant*
`cloud_provider` | (Optional) The cloud_provider used by apiserver: *gce*, *azure*, *vagrant*
`etcd_servers` | (Optional) Comma-delimited list of IP addresses the kube-apiserver and kubelet use to reach etcd. Uses the IP of the first machine in the kubernetes_master role.
`hostnamef` | (Optional) The full host name of the machine, i.e. hostname -f
`node_ip` | (Optional) The IP address to use to address this node