当root用户无密码，非超级权限用户时提示mysqladmin: Can't turn off logging; error: 'Access denied; you need the SUPER privilege for this op解决方案

问题：

在centOS上安装了mysql后，卸载了又重新安装，使用mysqladmin -u root password 'new password'

更改密码，提示： mysqladmin: Can't turn off logging; error: 'Access denied; you need the SUPER privilege for this operation'"

解决方案： 
1.修改MySQL的登录设置：
# vi /etc/my.cnf
在[mysqld]的段中加上一句：skip-grant-tables
例如：
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-name-resolve
skip-grant-tables
保存并且退出vi。 
  
重新启动mysqld
# /etc/init.d/mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]

登录并修改MySQL的root密码
# /usr/bin/mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3 to server version: 3.23.56

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> USE mysql ;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> UPDATE user SET Password = password ( 'new-password' ) WHERE User = 'root' ;
Query OK, 0 rows affected (0.00 sec)
Rows matched: 2 Changed: 0 Warnings: 0

mysql> flush privileges ;
Query OK, 0 rows affected (0.01 sec)

mysql> quit