src/Http/Controllers/Backend/ToolsController.php
public function enableMaintenanceMode()
    {
        $exitCode = Artisan::call('down');
        if ($exitCode === 0) {
            Session::put('admin_ip', request()->ip());
            Session::put('_enable-maintenance-mode', trans('canvas::messages.enable_maintenance_mode_success'));
        } else {
            Session::put('_enable-maintenance-mode', trans('canvas::messages.enable_maintenance_mode_error'));
        }

        return redirect()->route('canvas.admin.tools');
    }
public function enableMaintenanceMode()
    {
        $exitCode = Artisan::call('down');
        if ($exitCode === 0) {
            Session::put('admin_ip', request()->ip());
            Session::put('_enable-maintenance-mode', trans('canvas::messages.enable_maintenance_mode_success'));
        } else {
            Session::put('_enable-maintenance-mode', trans('canvas::messages.enable_maintenance_mode_error'));
        }

        return redirect()->route('canvas.admin.tools');
    }
Enable Application Maintenance Mode.

@return \Illuminate\View\View