Fatal error: Uncaught mysqli_sql_exception: Access denied for user 'app_user'@'172.18.0.2' (using password: YES) in /var/www/html/index.php:8 Stack trace: #0 /var/www/html/index.php(8): mysqli->__construct('mysql', 'app_user', Object(SensitiveParameterValue), 'yun75') #1 {main} thrown in /var/www/html/index.php on line 8