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安装完mysql-server 会提示可以运行mysql_secure_installation。运行mysql_secure_installation会执行几个设置：
--为root用户设置密码 --删除匿名账号 --取消root用户远程登录 --删除test库和对test库的访问权限 --刷新授权表使修改生效 通过这几项的设置能够提高mysql库的安全。建议生产环境中mysql安装这完成后一定要运行一次mysql_secure_installation，相关操作如下:
[root@localhost ~]# mysql_secure_installationNOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQLSERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY!In order to log into MySQL to secure it, we'll need the currentpassword for the root user. If you've just installed MySQL, andyou 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):<–初次运行直接回车OK, successfully used password, moving on…Setting the root password ensures that nobody can log into the MySQLroot user without the proper authorisation.Set root password? [Y/n] #是否设置root用户密码，输入y并回车或直接回车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 anyoneto log into MySQL without having to have a user account created forthem. This is intended only for testing, and to make the installationgo a bit smoother. You should remove them before moving into aproduction environment.Remove anonymous users? [Y/n] #是否删除匿名用户,生产环境建议删除，所以直接回车… Success!Normally, root should only be allowed to connect from 'localhost'. Thisensures that someone cannot guess at the root password from the network.Disallow root login remotely? [Y/n] #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 canaccess. This is also intended only for testing, and should be removedbefore moving into a production environment.Remove test database and access to it? [Y/n] #是否删除test数据库,直接回车- Dropping test database…… Success!- Removing privileges on test database…… Success!Reloading the privilege tables will ensure that all changes made so farwill take effect immediately.Reload privilege tables now? [Y/n] #是否重新加载权限表，直接回车… Success!Cleaning up…All done! If you've completed all of the above steps, your MySQLinstallation should now be secure.Thanks for using MySQL![root@localhost ~]#
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