diff --git a/backend/conf/config.yml b/backend/conf/config.yml
index f1042ca6..3805762a 100644
--- a/backend/conf/config.yml
+++ b/backend/conf/config.yml
@@ -15,6 +15,8 @@ redis:
 log:
   level: info
   path: "/var/logs/crawlab"
+  isDeletePeriodically: "Y"
+  deleteFrequency: "@hourly"
 server:
   host: 0.0.0.0
   port: 8000