当你安装 MySQL 完后、会有个提示：   [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   **对于这 2 种方式、我个人认为、mysql_secure_installation 比较好用***   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.     **我觉得、这里的关键应该是能够把匿名用户给删掉*** 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   **匿名用户的危害****   所以、生产环境请务必删之！！     我选择 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!