`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
`master_ip` | (Optional) The IP address that the kube-apiserver will bind against
`node_ip` | (Optional) The IP address to use to address this node
`minion_ip` | (Optional) Mapped to the kubelet hostname_override, K8S TODO - change this name
`network_mode` | (Optional) Networking model to use among nodes: *openvswitch*