From 77c1949326333a0f30bbb4b85e49f0b691ac46cf Mon Sep 17 00:00:00 2001
From: sanposhiho <44139130+sanposhiho@users.noreply.github.com>
Date: Wed, 22 Sep 2021 00:40:15 +0900
Subject: [PATCH] add usage message only when parsing flags failed

---
 cmd/kube-scheduler/scheduler.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/cmd/kube-scheduler/scheduler.go b/cmd/kube-scheduler/scheduler.go
index 39c873c4f65..b6ef3a83b9f 100644
--- a/cmd/kube-scheduler/scheduler.go
+++ b/cmd/kube-scheduler/scheduler.go
@@ -49,6 +49,12 @@ func runSchedulerCmd() error {
 	logs.InitLogs()
 	defer logs.FlushLogs()
 
+	err := command.ParseFlags(os.Args[1:])
+	if err != nil {
+		// when fail to parse flags, return error with the usage message.
+		return fmt.Errorf("%v\n%s", err, command.UsageString())
+	}
+
 	if err := command.Execute(); err != nil {
 		return err
 	}