首先停掉mysql服务，在/etc/my.cnf中添加 skip-grant-tables，同时可以添加skip-networking选项来禁用网络功能，防止这时其他人通过网络连接到数据库

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

symbolic-links=0

skip-grant-tables #添加这一行

启动服务，进入数据库

MariaDB [(none)]> 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

[email protected]，没有就用update添加

MariaDB [mysql]> select host,user,password from user;

+-----------------------+------+-------------------------------------------+

| host | user | password |

+-----------------------+------+-------------------------------------------+

| % | LEE | *E6CC90B878B948C35E92B003C792C46C58C4AF40 |

| % | root | *E6CC90B878B948C35E92B003C792C46C58C4AF40 |

| localhost | root | |

| localhost.localdomain | | |

| 127.0.0.1 | root | |

+-----------------------+------+-------------------------------------------+

5 rows in set (0.00 sec)

[email protected]

MariaDB [mysql]> UPDATE user SET password=PASSWORD(‘1‘) WHERE user=‘root‘ AND host=‘localhost‘;

Query OK, 1 row affected (0.00 sec)

Rows matched: 1 Changed: 1 Warnings: 0

#把相应的权限附上

MariaDB [mysql]> update user set

-> `Select_priv` = ‘Y‘,

-> `Insert_priv` = ‘Y‘,

-> `Update_priv` = ‘Y‘,

-> `Delete_priv` = ‘Y‘,

-> `Create_priv` = ‘Y‘,

-> `Drop_priv` = ‘Y‘,

-> `Reload_priv` = ‘Y‘,

-> `Shutdown_priv` = ‘Y‘,

-> `Process_priv` = ‘Y‘,

-> `File_priv` = ‘Y‘,

-> `Grant_priv` = ‘Y‘,

-> `References_priv` = ‘Y‘,

-> `Index_priv` = ‘Y‘,

-> `Alter_priv` = ‘Y‘,

-> `Show_db_priv` = ‘Y‘,

-> `Super_priv` = ‘Y‘,

-> `Create_tmp_table_priv` = ‘Y‘,

-> `Lock_tables_priv` = ‘Y‘,

-> `Execute_priv` = ‘Y‘,

-> `Repl_slave_priv` = ‘Y‘,

-> `Repl_client_priv` = ‘Y‘,

-> `Create_view_priv` = ‘Y‘,

-> `Show_view_priv` = ‘Y‘,

-> `Create_routine_priv` = ‘Y‘,

-> `Alter_routine_priv` = ‘Y‘,

-> `Create_user_priv` = ‘Y‘,

-> `Event_priv` = ‘Y‘,

-> `Trigger_priv` = ‘Y‘,

-> `Create_tablespace_priv` = ‘Y‘

-> where user=‘root‘ and host=‘localhost‘;

Query OK, 1 row affected (0.00 sec)

Rows matched: 1 Changed: 1 Warnings: 0

#更新数据库

MariaDB [mysql]> FLUSH PRIVILEGES;

Query OK, 0 rows affected (0.00 sec)

在之后退出数据库，把刚才改的配置文件还原回来，重启数据库就好了。

原文：https://www.cnblogs.com/forlive/p/9768006.html