linux 修改mysql密码

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-grant-tables 

保存并且退出vi。
3．重新启动mysqld 

# /etc/init.d/mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ] 

4．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 mysql.user set password=password（'123456'） 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
Bye
5．将MySQL的登录设置修改回来
# vi /etc/my.cnf
将刚才在[mysqld]的段中加上的skip-grant-tables删除
保存并且退出vi。
6．重新启动mysqld
# /etc/init.d/mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]