Warning: mysqli_connect(): php_network_getaddresses: getaddrinfo for db failed: Temporary failure in name resolution in /var/www/html/db.php on line 7

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for db failed: Temporary failure in name resolution in /var/www/html/db.php:7 Stack trace: #0 /var/www/html/db.php(7): mysqli_connect('db', 'usuario_inventa...', Object(SensitiveParameterValue), 'ronald') #1 /var/www/html/login.php(3): include('/var/www/html/d...') #2 {main} thrown in /var/www/html/db.php on line 7