I permessi di mysql

CREATE USER 'root'@'172.21.3.35' IDENTIFIED BY '';

GRANT ALL ON *.* TO 'root'@'172.21.3.35' WITH GRANT OPTION;

FLUSH PRIVILEGES;

ATTENZIONE:

In 4.1.x, you don't need to use CREATE USER. Simply using GRANT to
grant privileges to a user implicitly "creates" the user.