mysql8.0设置简单密码报错ERROR : Your password does not satisfy the current policy requirements

【原因】

原来MySQL5.6.6版本之后增加了密码强度验证插件validate_password，相关参数设置的较为严格。
使用了该插件会检查设置的密码是否符合当前设置的强度规则，若不满足则拒绝设置。影响的语句和函数有：create user,grant,set password,password(),old password。

【解决】

1） 查看mysql全局参数配置

该问题其实与mysql的validate_password_policy的值有关。
查看一下msyql密码相关的几个全局参数：

mysql> select @@validate_password_policy;
+----------------------------+
| @@validate_password_policy |
+----------------------------+
| MEDIUM                     |
+----------------------------+
1 row in set (0.00 sec)
 
 
mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+--------+
| Variable_name                        | Value  |
+--------------------------------------+--------+
| validate_password.dictionary_file    |        |
| validate_password.length             | 8      |
| validate_password.mixed_case_count   | 1      |
| validate_password.number_count       | 1      |
| validate_password.policy             | MEDIUM |
| validate_password.special_char_count | 1      |
+--------------------------------------+--------+
6 rows in set (0.08 sec)

 

2）参数解释

validate_password.dictionary_file
插件用于验证密码强度的字典文件路径。

validate_password.length
密码最小长度，参数默认为8，它有最小值的限制，最小值为：validate_password_number_count + validate_password_special_char_count + (2 * validate_password_mixed_case_count)

validate_password.mixed_case_count
密码至少要包含的小写字母个数和大写字母个数。

validate_password.number_count
密码至少要包含的数字个数。

validate_password.policy
密码强度检查等级，0/LOW、1/MEDIUM、2/STRONG。有以下取值：
Policy                 Tests Performed                                                                                                        
0 or LOW               Length                                                                                                                      
1 or MEDIUM         Length; numeric, lowercase/uppercase, and special characters                             
2 or STRONG        Length; numeric, lowercase/uppercase, and special characters; dictionary file      
默认是1，即MEDIUM，所以刚开始设置的密码必须符合长度，且必须含有数字，小写或大写字母，特殊字符。

validate_password.special_char_count
密码至少要包含的特殊字符数。

3）修改mysql参数配置

    mysql> set global validate_password.policy=0;
    Query OK, 0 rows affected (0.05 sec)
     
    mysql>
    mysql>
    mysql> set global validate_password.mixed_case_count=0;
    Query OK, 0 rows affected (0.00 sec)
     
    mysql> set global validate_password.number_count=3;
    Query OK, 0 rows affected (0.00 sec)
     
    mysql> set global validate_password.special_char_count=0;
    Query OK, 0 rows affected (0.00 sec)
     
    mysql> set global validate_password.length=3;
    Query OK, 0 rows affected (0.00 sec)
     
    mysql> SHOW VARIABLES LIKE 'validate_password%';
    +--------------------------------------+-------+
    | Variable_name                        | Value |
    +--------------------------------------+-------+
    | validate_password.dictionary_file    |       |
    | validate_password.length             | 3     |
    | validate_password.mixed_case_count   | 0     |
    | validate_password.number_count       | 3     |
    | validate_password.policy             | LOW   |
    | validate_password.special_char_count | 0     |
    +--------------------------------------+-------+
    6 rows in set (0.00 sec)

 

4）修改密码：

    ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'new-password';

    Query OK, 0 rows affected, 1 warning (0.00 sec)

 OK了。