diff --git a/metadata/service/pool/single.yml b/metadata/service/pool/single.yml
index b01a719..62e5911 100644
--- a/metadata/service/pool/single.yml
+++ b/metadata/service/pool/single.yml
@@ -30,6 +30,7 @@
         kube_proxy: ${_param:kubernetes_kube-proxy_token}
       ca: kubernetes
       network:
+        hash: 77169cdadb80a5e33e9d9fe093ed0d99
         etcd:
           members:
             - host: ${_param:master_address}