Mac下mysql 更改root密码

1. 登录mysql

➜  ~ mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 29
Server version: 8.0.12 Homebrew

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> 

2. 修改mysql密码

ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

此时报错 重新设置的密码不符合当前策略

安装mysql的时候选择的low 默认是8位密码，现在想设置为6位报错

3. 查看策略

SHOW VARIABLES LIKE 'validate_password%';

mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+-------+
| Variable_name                        | Value |
+--------------------------------------+-------+
| validate_password.check_user_name    | ON    |
| validate_password.dictionary_file    |       |
| validate_password.length             | 8     |
| validate_password.mixed_case_count   | 1     |
| validate_password.number_count       | 1     |
| validate_password.policy             | LOW   |
| validate_password.special_char_count | 1     |
+--------------------------------------+-------+
7 rows in set (0.02 sec)

4. 设置密码

// 设置策略
set global validate_password.policy=LOW;
// 设置密码长度
set global validate_password.length=6;
// 设置密码
ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';

// 设置策略
mysql> set global validate_password.policy=LOW;
Query OK, 0 rows affected (0.00 sec)

// 设置密码长度
mysql> set global validate_password.length=6;
Query OK, 0 rows affected (0.00 sec)

// 设置密码
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';
Query OK, 0 rows affected (0.08 sec)

mysql>