Add --image-type option to GKE kube-up

cluster/gke/config-common.sh

@@ -30,6 +30,7 @@ CMD_GROUP="${CMD_GROUP:-}"
 GCLOUD_CONFIG_DIR="${GCLOUD_CONFIG_DIR:-${HOME}/.config/gcloud/kubernetes}"
 NODE_SCOPES="${NODE_SCOPES:-"compute-rw,storage-ro"}"
 MACHINE_TYPE="${MACHINE_TYPE:-n1-standard-2}"
+IMAGE_TYPE="${IMAGE_TYPE:-}"
 
 # WARNING: any new vars added here must correspond to options that can be
 # passed to `gcloud {CMD_GROUP} container clusters create`, or they will

cluster/gke/config-test.sh

@@ -18,6 +18,7 @@
 CLUSTER_NAME="${CLUSTER_NAME:-${USER}-gke-e2e}"
 NETWORK=${KUBE_GKE_NETWORK:-e2e}
 NODE_TAG="k8s-${CLUSTER_NAME}-node"
+IMAGE_TYPE="${KUBE_GKE_IMAGE_TYPE:-}"
 
 
 # For ease of maintenance, extract any pieces that do not vary between default

cluster/gke/util.sh

@@ -172,6 +172,10 @@ function kube-up() {
     create_args+=("--cluster-ipv4-cidr=${CLUSTER_IP_RANGE}")
   fi
 
+  if [[ ! -z "${IMAGE_TYPE:-}" ]]; then
+    create_args+=("--image-type=${IMAGE_TYPE}")
+  fi
+
   create_args+=( ${GKE_CREATE_FLAGS:-} )
 
   # Bring up the cluster.