Warning: mysqli_connect(): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution in /var/www/html/index.php on line 27

Warning: mysqli_connect(): (HY000/2002): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution in /var/www/html/index.php on line 27
Не могу создать соединение