diff --git a/cluster/kubemark/gce/config-default.sh b/cluster/kubemark/gce/config-default.sh
index f75fbfb2e8b..94b7dfb3464 100644
--- a/cluster/kubemark/gce/config-default.sh
+++ b/cluster/kubemark/gce/config-default.sh
@@ -27,8 +27,8 @@ REGION=${ZONE%-*}
 NUM_NODES=${KUBEMARK_NUM_NODES:-10}
 MASTER_SIZE=${KUBEMARK_MASTER_SIZE:-n1-standard-$(get-master-size)}
 MASTER_DISK_TYPE=pd-ssd
-MASTER_DISK_SIZE=${MASTER_DISK_SIZE:-20GB}
-MASTER_ROOT_DISK_SIZE=${KUBEMARK_MASTER_ROOT_DISK_SIZE:-10GB}
+MASTER_DISK_SIZE=${MASTER_DISK_SIZE:-$(get-master-disk-size)}
+MASTER_ROOT_DISK_SIZE=${KUBEMARK_MASTER_ROOT_DISK_SIZE:-$(get-master-root-disk-size)}
 REGISTER_MASTER_KUBELET=${REGISTER_MASTER:-false}
 PREEMPTIBLE_NODE=${PREEMPTIBLE_NODE:-false}
 NODE_ACCELERATORS=${NODE_ACCELERATORS:-""}
@@ -56,7 +56,7 @@ MASTER_TAG="kubemark-master"
 ETCD_QUORUM_READ="${ENABLE_ETCD_QUORUM_READ:-false}"
 EVENT_STORE_NAME="${INSTANCE_PREFIX}-event-store"
 MASTER_IP_RANGE="${MASTER_IP_RANGE:-10.246.0.0/24}"
-CLUSTER_IP_RANGE="${CLUSTER_IP_RANGE:-10.224.0.0/11}"
+CLUSTER_IP_RANGE="${CLUSTER_IP_RANGE:-$(get-cluster-ip-range)}"
 RUNTIME_CONFIG="${KUBE_RUNTIME_CONFIG:-}"
 TERMINATED_POD_GC_THRESHOLD=${TERMINATED_POD_GC_THRESHOLD:-100}
 KUBE_APISERVER_REQUEST_TIMEOUT=300