After MySQL is installed, a root user and an anonymous user will be automatically created, which is ignored by many users, this is probably because anonymous users are set to be only available locally by default.
However, if MySQL is to be used as a database for Web servers, it may be costly to ignore this anonymous user. By default, this anonymous user has almost the same permissions as root on localhost. It is very likely that a visitor uploads a PHP file, creates a new user with this PHP file, gives him a higher permission, and then uses this new user to connect to the MySQL server, manage the MySQL of the server.
The DELETE command is as follows:
Copy codeThe Code is as follows:
MySQL> UPDATE user set password = PASSWORD ('your password') where user = '';
MySQL> flush privileges;
Follow these steps to delete anonymous users in mysql:
[Root @ sample ~] # Mysql-u root-p login using the password to log on as root
Enter password: Enter password here
Welcome to the MySQL monitor. Commands end with; or \ g.
Your MySQL connection id is 7 to server version: 4.1.20
Type 'help; 'or' \ H' for help. Type '\ C' to clear the buffer.
Mysql> select user, host from mysql. user; users view user information
+ ------ + ---------------------------- +
| User | host |
+ ------ + ---------------------------- +
| Localhost |
| Root | localhost |
| Sample.centospub.com |
| Root | sample.centospub.com |
+ ------ + ---------------------------- +
4 rows in set (0.02 sec)
Mysql> delete from mysql. user where user = ''; anonymous deletes Anonymous Users
Query OK, 2 rows affected (0.17 sec)
Mysql> select user, host from mysql. user; users view user information
+ ------ + ---------------------------- +
| User | host |
+ ------ + ---------------------------- +
| Root | localhost |
| Root | sample.centospub.com |
+ ------ + ---------------------------- +
2 rows in set (0.00 sec)
Mysql> exit MySQL Server
Bye