add a message of removal for gateway and hide the command (#15965)

cmd/main.go

@@ -131,6 +131,7 @@ func newApp(name string) *cli.App {
 
 	// Register all commands.
 	registerCommand(serverCmd)
+	registerCommand(gatewayCmd) // hidden kept for guiding users.
 
 	// Set up app.
 	cli.HelpFlag = cli.BoolFlag{

cmd/prepare-storage.go

@@ -157,9 +157,17 @@ func connectLoadInitFormats(verboseLogging bool, firstDisk bool, endpoints Endpo
 	for i, err := range errs {
 		if err != nil && !errors.Is(err, errXLBackend) {
 			if errors.Is(err, errDiskNotFound) && verboseLogging {
-				logger.Error("Unable to connect to %s: %v", endpoints[i], isServerResolvable(endpoints[i], time.Second))
+				if globalEndpoints.NEndpoints() > 1 {
+					logger.Error("Unable to connect to %s: %v", endpoints[i], isServerResolvable(endpoints[i], time.Second))
+				} else {
+					logger.Fatal(err, "Unable to connect to %s: %v", endpoints[i], isServerResolvable(endpoints[i], time.Second))
+				}
 			} else {
-				logger.Error("Unable to use the drive %s: %v", endpoints[i], err)
+				if globalEndpoints.NEndpoints() > 1 {
+					logger.Error("Unable to use the drive %s: %v", endpoints[i], err)
+				} else {
+					logger.Fatal(errInvalidArgument, "Unable to use the drive %s: %v", endpoints[i], err)
+				}
 			}
 		}
 	}

cmd/server-main.go

@@ -93,6 +93,20 @@ var ServerFlags = []cli.Flag{
 	},
 }
 
+var gatewayCmd = cli.Command{
+	Name:            "gateway",
+	Usage:           "start object storage gateway",
+	Hidden:          true,
+	Flags:           append(ServerFlags, GlobalFlags...),
+	HideHelpCommand: true,
+	Action:          gatewayMain,
+}
+
+func gatewayMain(ctx *cli.Context) error {
+	logger.Fatal(errInvalidArgument, "Gateway is deprecated, To continue to use Gateway please use releases no later than 'RELEASE.2022-10-24T18-35-07Z'. We recommend all our users to migrate from gateway mode to server mode. Please read https://blog.min.io/deprecation-of-the-minio-gateway/")
+	return nil
+}
+
 var serverCmd = cli.Command{
 	Name:   "server",
 	Usage:  "start object storage server",