diff --git a/system/nova/control/single.yml b/system/nova/control/single.yml
new file mode 100644
index 0000000..00182a3
--- /dev/null
+++ b/system/nova/control/single.yml
@@ -0,0 +1,7 @@
+classes:
+- service.nova.control.single
+parameters:
+  nova:
+    controller:
+      database:
+        host: ${_param:single_address}