fix nginx keepalived
diff --git a/nginx/server/single.yml b/nginx/server/single.yml
index b35db14..b77a76f 100644
--- a/nginx/server/single.yml
+++ b/nginx/server/single.yml
@@ -1,5 +1,4 @@
 classes:
-- service.keepalived.cluster.single
 - service.nginx.server.single
 - service.nginx.server.stats
 parameters: