export KUBE_OS_DISTRIBUTION=coreos
export KUBE_GCE_MASTER_PROJECT=coreos-cloud
export KUBE_GCE_MASTER_IMAGE=coreos-beta-991-2-0-v20160326
cluster/kube-up.sh
TODO - try it with a newer version of coreos -- coreos-beta-1010-1-0-v20160425 or coreos-stable-899-15-0-v20160405