add bind9 backend
diff --git a/designate/server/single.yml b/designate/server/single.yml
index 8805d53..bef6e4d 100644
--- a/designate/server/single.yml
+++ b/designate/server/single.yml
@@ -34,4 +34,4 @@
         port: 5672
         user: openstack
         password: ${_param:rabbitmq_openstack_password}
-        virtual_host: '/openstack'
\ No newline at end of file
+        virtual_host: '/openstack'