diff --git a/cluster/gce/config-default.sh b/cluster/gce/config-default.sh
index b3def4c988e..d6d5cc5d4de 100755
--- a/cluster/gce/config-default.sh
+++ b/cluster/gce/config-default.sh
@@ -91,8 +91,8 @@ RUNTIME_CONFIG="${KUBE_RUNTIME_CONFIG:-}"
 
 # Optional: Install cluster DNS.
 ENABLE_CLUSTER_DNS="${KUBE_ENABLE_CLUSTER_DNS:-true}"
-DNS_SERVER_IP="10.0.0.10"
-DNS_DOMAIN="cluster.local"
+DNS_SERVER_IP="${KUBE_DNS_SERVER_IP:-10.0.0.10}"
+DNS_DOMAIN="${KUBE_DNS_DOMAIN:-cluster.local}"
 DNS_REPLICAS=1
 
 # Optional: Install cluster docker registry.