在安装MySQL-server，见上面的一段话，大意是全新安装设置的root密码在/root/.mysql_secret中，这是一个随机密码，你需要运行/usr/bin/mysql_secure_installation，删除anonymous用户。当然不建议用root用户来运行，rpm包已经建了一个mysql用户，可以使用这个用户：
#more .mysql_secret # The random password set for the root user at Tue Nov 18 22:57:46 2014 (local t ime): NljqL63OYlGo5cqy <– 得到root访问mysql的密码：NljqL63OYlGo5cqy # service mysql start Starting MySQL... SUCCESS! # /usr/bin/mysql_secure_installation --user=mysql 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): <–使用刚才得到的root的密码 NljqL63OYlGo5cqy 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] y <– 是否更换root用户密码，输入y并回车，强烈建议更换 New password: <– 设置root用户的密码 Re-enter new password: <– 再输入一次你设置的密码 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] y <– 是否删除匿名用户,生产环境建议删除，所以输入y并回车 ... 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 <–是否禁止root远程登录,根据自己的需求选择Y/n并回车,建议禁止 ... 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] y <– 是否删除test数据库,输入y并回车 - 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 是否重新加载权限表，输入y并回车 ... Success! All done! If you've completed all of the above steps, your MySQL installation should now be secure. Thanks for using MySQL! Cleaning up...
至此，MySQL已经安装完成，最后看一下是否已将MySQL加到开机服务里：
# chkconfig auditd 0:off 1:off 2:on 3:on 4:on 5:on 6:off blk-availability 0:off 1:on 2:on 3:on 4:on 5:on 6:off crond 0:off 1:off 2:on 3:on 4:on 5:on 6:off ip6tables 0:off 1:off 2:on 3:on 4:on 5:on 6:off iptables 0:off 1:off 2:on 3:on 4:on 5:on 6:off iscsi 0:off 1:off 2:off 3:on 4:on 5:on 6:off iscsid 0:off 1:off 2:off 3:on 4:on 5:on 6:off lvm2-monitor 0:off 1:on 2:on 3:on 4:on 5:on 6:off mdmonitor 0:off 1:off 2:on 3:on 4:on 5:on 6:off multipathd 0:off 1:off 2:off 3:off 4:off 5:off 6:off mysql 0:off 1:off 2:on 3:on 4:on 5:on 6:off <-看到这个OK了 netconsole 0:off 1:off 2:off 3:off 4:off 5:off 6:off netfs 0:off 1:off 2:off 3:on 4:on 5:on 6:off network 0:off 1:off 2:on 3:on 4:on 5:on 6:off postfix 0:off 1:off 2:on 3:on 4:on 5:on 6:off rdisc 0:off 1:off 2:off 3:off 4:off 5:off 6:off restorecond 0:off 1:off 2:off 3:off 4:off 5:off 6:off rsyslog 0:off 1:off 2:on 3:on 4:on 5:on 6:off saslauthd 0:off 1:off 2:off 3:off 4:off 5:off 6:off sshd 0:off 1:off 2:on 3:on 4:on 5:on 6:off udev-post 0:off 1:on 2:on 3:on 4:on 5:on 6:off