allow more socket listeners per instance for multi-core setups (#13385)

cmd/server-main.go

@@ -55,6 +55,11 @@ var ServerFlags = []cli.Flag{
 		Value: ":" + GlobalMinioDefaultPort,
 		Usage: "bind to a specific ADDRESS:PORT, ADDRESS can be an IP or hostname",
 	},
+	cli.IntFlag{
+		Name:  "listeners",
+		Value: 1,
+		Usage: "bind N number of listeners per ADDRESS:PORT",
+	},
 	cli.StringFlag{
 		Name:  "console-address",
 		Usage: "bind to a specific ADDRESS:PORT for embedded Console UI, ADDRESS can be an IP or hostname",
@@ -497,8 +502,16 @@ func serverMain(ctx *cli.Context) {
 		getCert = globalTLSCerts.GetCertificate
 	}
 
-	httpServer := xhttp.NewServer([]string{globalMinioAddr},
-		criticalErrorHandler{corsHandler(handler)}, getCert)
+	listeners := ctx.Int("listeners")
+	if listeners == 0 {
+		listeners = 1
+	}
+	addrs := make([]string, 0, listeners)
+	for i := 0; i < listeners; i++ {
+		addrs = append(addrs, globalMinioAddr)
+	}
+
+	httpServer := xhttp.NewServer(addrs, criticalErrorHandler{corsHandler(handler)}, getCert)
 	httpServer.BaseContext = func(listener net.Listener) context.Context {
 		return GlobalContext
 	}