The security issue with MySQL begins with the installation

When you have installed MySQL, there will be a prompt:

[root@localhost Desktop]# rpm -ivh MySQL-server-5.5.28-1.rhel5.i386.rpm
Preparing... ########################################### [100%]
1:MySQL-server ########################################### [100%]


PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:

/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h localhost.localdomain password 'new-password'


Alternatively you can run:

/usr/bin/mysql_secure_installation

** for these two ways, I personally think, mysql_secure_installation is better ***

which will also give you the option of removing the test
databases and anonymous user created by default. This is
strongly recommended for production servers.


** I think, here the key should be able to put anonymous users to delete ***
See the manual for more instructions.

Please report any problems with the /usr/bin/mysqlbug script!


By default, a MySQL installation has an anonymous user, allowing anyone
to log into MySQL without having to have a user account created for

them. This is intended only for testing, and to make the installationgo a bit smoother.

You should remove them before moving into a production environment

** dangers of anonymous users ****

Therefore, the production environment must be deleted!!

I choose mysql_secure_installation

[root@localhost Desktop]# mysql_secure_installation

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL
SERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY!

In order to log into MySQL to secure it, we'll need the current
password for the root user. If you've just installed MySQL, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none):
OK, successfully used password, moving on...


Setting the root password ensures that nobody can log into the MySQL
root user without the proper authorisation.

You already have a root password set, so you can safely answer 'n'.

Change the root password? [Y/n] n
... skipping.

By default, a MySQL installation has an anonymous user, allowing anyone
to log into MySQL without having to have a user account created for
them. This is intended only for testing, and to make the installation
go a bit smoother. You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] y
... Success!

Normally, root should only be allowed to connect from 'localhost'. This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] n
... skipping.

By default, MySQL comes with a database named 'test' that anyone can
access. This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] n
... skipping.


Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.


Reload privilege tables now? [Y/n] y
... Success!


Cleaning up...


All done! If you've completed all of the above steps, your MySQL
installation should now be secure.

Thanks for using MySQL!