composer require rdehnhardt/lumen-maintenance-mode
In bootstrap/app.php, add this instruction in providers
$app->register(
Rdehnhardt\MaintenanceMode\Providers\MaintenanceModeServiceProvider::class
);
resources/views/errors/503.blade.php
php artisan down
php artisan up
In .env file
ALLOWED_IPS=999.99.9.999,999.99.9.999,999.99.9.999