在安装完MySql服务器，设置好MySql的root用户密码后，就直接开始使用了，其实这样的MySql服务器还存在着一些不安全因素，本篇演示
在安装完mysql服务器，设置好mysql的root用户密码后，就直接开始使用了，其实这样的mysql服务器还存在着一些不安全因素，本篇演示一下用命令mysql_secure_installation来安全初始化我们的mysql服务器。
第一步，安装，启动MySql服务器，并添加到开机自动启动：
[root@test ~]# \cp -f /usr/share/mysql/my-medium.cnf /etc/my.cnf
*/etc/my.cnf的详细设定等，不在本篇讨论范围，读者根据你自己的需求设置，在这里直接用了自带的my-medium.cnf。
[root@test ~]# /etc/init.d/mysqld start
[root@test ~]# chkconfig mysqld on
第二步，，用mysql_secure_installation安全初始化MySql服务器：
[root@test ~]# /usr/bin/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.
Set root password? [Y/n] Y
New password:
Re-enter new password:
Password updated successfully!
Reloading privilege tables..
... Success!
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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] Y
... Success!
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] test，删除，输入Y回车
- Dropping test database...
... Success!
- Removing privileges on test database...
... Success!
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!
后话：我们都知道，安全只是相对的，所以并不是说有了上面的安全初始化，我们的MySql服务器就绝对安全了。
