1.在[mysqld]中添加skip-grant-tables
vi /etc/my.cnf
skip-grant-tables ##忽略mysql权限问题,直接登录
例如:
[mysqld]
skip-grant-tables
datadir=/var/lib/MySQL
socket=/var/lib/mysql/mysql.sock
3.重启mysql
service mysql restart
4.用户无密码登录
mysql -uroot -p (直接点击回车,密码为空)
5.选择数据库
use mysql;
6.修改root密码
update user set authentication_string=password('123456') where user='root';
7.执行
flush privileges;
8.退出
exit;
9.删除
skip-grant-tables
10.重启mysql
service mysql restart 或 service mysqld restart
其它版本
1.修改MySQL的登录设置:
vim /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。
2.重新启动mysqld
# service mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]
3.登录并修改MySQL的root密码
# 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 ;
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
4.将MySQL的登录设置修改回来
vim /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vim
5.重新启动mysqld
# service mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]