2.开始安装MySQL5
首先我们应该先用下面的命令安装MySQL：
yum install mysql mysql-server
然后我们需要创建MySQL系统的启动键链接启动MySQL服务器，这样以便于MySQL在系统启动时自动启动
chkconfig --levels 235 mysqld on
/etc/init.d/mysqld start
为MySQL root帐户设置密码：
mysql_secure_installation
会出现下面的一系列提示：
root@server1 ~]# 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]
New password：
Re-enter new password：
Password updated successfully！
Reloading privilege tables..
... Success！
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]
... 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]
... 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]
- 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]
... 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！
[root@server1 ~]#
)
...)
