对我来说，在ubuntu新安装的mysqld上不起作用，必须添加这个:到/etc/mysql/mysql.conf.d/mysqld.cnf，否则服务器不会启动(猜测插件没有在正确的时间加载，当我只是添加它而没有plugin-load-add指令时)

plugin-load-add=validate_password.so
validate_password_policy=LOW
validate_password_length=8
validate_password_mixed_case_count=0
validate_password_number_count=0
validate_password_special_char_count=0

我有同样的问题，答案就在你面前，记得当你在安装mysql的时候运行脚本

sudo mysql_secure_installation

您可以在某个地方选择想要的密码类型

密码验证策略有三种级别:

LOW长度>= 8 中等长度>= 8，数字，混合大小写，特殊字符 STRONG长度>= 8，数字，混合大小写，特殊字符和字典文件

请输入0 = LOW, 1 = MEDIUM, 2 = STRONG:

你必须给相同的策略设置密码

下面是一些密码示例: 对于类型0:abcdabcd 类型1:abcd1234 类型2:ancd@1234

因为你的密码。你可以在MySQL客户端中使用以下查询查看密码验证配置指标:

SHOW VARIABLES LIKE 'validate_password%';

输出应该是这样的:

+--------------------------------------+-------+
| Variable_name                        | Value |
+--------------------------------------+-------+
| validate_password.check_user_name    | ON    |
| validate_password.dictionary_file    |       |
| validate_password.length             | 6     |
| validate_password.mixed_case_count   | 1     |
| validate_password.number_count       | 1     |
| validate_password.policy             | LOW   |
| validate_password.special_char_count | 1     |
+--------------------------------------+-------+

然后可以将密码策略级别设置低一些，例如:

SET GLOBAL validate_password.length = 6;
SET GLOBAL validate_password.number_count = 0;

查看MySQL文档。

如果你想设置一个空白密码。然后在MySQL客户端运行以下查询:

SET GLOBAL validate_password.check_user_name = No;
SET GLOBAL validate_password.dictionary_file = '';
SET GLOBAL validate_password.length = 0;
SET GLOBAL validate_password.mixed_case_count = 0;
SET GLOBAL validate_password.number_count = 0;
SET GLOBAL validate_password.policy = LOW;
SET GLOBAL validate_password.special_char_count = 0;

输出应该是这样的:

    SHOW VARIABLES LIKE 'validate_password%';

+--------------------------------------+-------+
| Variable_name                        | Value |
+--------------------------------------+-------+
| validate_password.check_user_name    | ON    |
| validate_password.dictionary_file    |       |
| validate_password.length             | 0     |
| validate_password.mixed_case_count   | 0     |
| validate_password.number_count       | 0     |
| validate_password.policy             | LOW   |
| validate_password.special_char_count | 0     |
+--------------------------------------+-------+

然后，您可以使用以下查询更新您的空白密码:

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '';

this information is important to all answers above : When you restart mysql server all policy config will be RESET and will be LOST, so to make your policy configuration PERSISTENT, you should follow these instructions: (tested on ubuntu server version 20.10)

用mysql应用这些变化后，洪阮回答 Sudo nano /etc/mysql/mysql.conf.d/mysqld.cnf 加上最后一行:

[mysqld]
#
# * Basic Settings
#
..
..
..
validate_password.policy = LOW   # <== this line
..
..
# IMPORTANT notes: 
# - you can add more policy commands each by your needs.
# - notice the "." before "policy" , in some mysql versions is "_" , so be aware of that.

保存文件并重新启动mysql server: sudo service mysql restart 连接并检查配置的持久性: Sudo mysql -u your_username -p 显示像"validate_pass%"这样的变量; 结果应该是这样的:

+--------------------------------------+-------+
| Variable_name                        | Value |
+--------------------------------------+-------+
| validate_password.check_user_name    | ON    |
| validate_password.dictionary_file    |       |
| validate_password.length             | 6     |
| validate_password.mixed_case_count   | 1     |
| validate_password.number_count       | 0     |
| validate_password.policy             | LOW   |
| validate_password.special_char_count | 1     |
+--------------------------------------+-------+

我希望这能帮助到人们。

编辑:感谢@ahmednawazbutt:不要忘记FLUSH特权;

mysql> SET GLOBAL validate_password.policy = 0;