Warning: mysqli_connect(): php_network_getaddresses: getaddrinfo for db failed: Temporary failure in name resolution in /var/www/html/_dbconnect.php on line 15

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for db failed: Temporary failure in name resolution in /var/www/html/_dbconnect.php:15 Stack trace: #0 /var/www/html/_dbconnect.php(15): mysqli_connect('db', 'root', Object(SensitiveParameterValue), 'ilife', '3306') #1 /var/www/html/login.php(3): include('/var/www/html/_...') #2 {main} thrown in /var/www/html/_dbconnect.php on line 15