Warning: mysqli::__construct(): php_network_getaddresses: getaddrinfo for db failed: Temporary failure in name resolution in /var/www/html/db.php on line 10

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for db failed: Temporary failure in name resolution in /var/www/html/db.php:10 Stack trace: #0 /var/www/html/db.php(10): mysqli->__construct('db', 'root', Object(SensitiveParameterValue), 'db_siskeu_local...') #1 /var/www/html/login.php(3): include('/var/www/html/d...') #2 {main} thrown in /var/www/html/db.php on line 10