编译安装完mysql5.6，如果用于生产环境，最好执行mysql_secure_installation来做一些常规化安全设置。
需要提前将~mysql/bin加入环境变量
/apps/mysql//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):
提示输入密码，没有密码就直接回车
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]
提示设置root user密码 Y
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]
生产环境建议删除系统创建的匿名用户 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]
禁止root用户远程登录 Y
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]
删除test数据库 Y
- 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]
重载权限表 Y
... 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...
完成~~~
完成后空密码已经无法登录
# mysql
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
mysql> select user,host from mysql.user;
+-------+-----------+
| user | host |
+-------+-----------+
| root | 127.0.0.1 |
| root | ::1 |
| root | localhost |
+-------+-----------+
4 rows in set (0.01 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
+--------------------+
3 rows in set (0.00 sec)
