Warning: mysqli_connect(): php_network_getaddresses: getaddrinfo for testing.upperformance.ru failed: Temporary failure in name resolution in /var/www/html/modules/System/DatabaseService.php on line 7

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for testing.upperformance.ru failed: Temporary failure in name resolution in /var/www/html/modules/System/DatabaseService.php:7 Stack trace: #0 /var/www/html/modules/System/DatabaseService.php(7): mysqli_connect() #1 /var/www/html/services/system.php(13): System\DatabaseService->__construct() #2 /var/www/html/modules/System/ServiceController.php(13): include('...') #3 /var/www/html/index.php(5): System\ServiceController::includeServices() #4 {main} thrown in /var/www/html/modules/System/DatabaseService.php on line 7