Linux环境下修改密码报ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

ゝ一纸荒年。 2022-01-15 19:45 264阅读 0赞

为了加强安全性，MySQL5.7为root用户随机生成了一个密码，在error log中，关于error log的位置，如果安装的是RPM包，则默认是/var/log/mysqld.log。

一般可通过log\_error设置

mysql> select @@log_error;
    +---------------------+
    | @@log_error         |
    +---------------------+
    | /var/log/mysqld.log |
    +---------------------+
    row in set (0.00 sec)

可通过# grep "password" /var/log/mysqld.log 命令获取MySQL的临时密码

2016-01-19T05:16:36.218234Z 1 [Note] A temporary password is generated for root@localhost: waQ,qR%be2(5

用该密码登录到服务端后，必须马上修改密码，不然会报如下错误：

mysql> select user();
    ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

如果只是修改为一个简单的密码，会报以下错误：

mysql>  ALTER USER USER() IDENTIFIED BY '12345678';
    ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

这个其实与validate\_password\_policy的值有关。

validate\_password\_policy有以下取值：

<table> 
 <thead> 
  <tr> 
   <th>Policy</th> 
   <th>Tests Performed</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td><code>0</code>&nbsp;or&nbsp;<code>LOW</code></td> 
   <td>Length</td> 
  </tr> 
  <tr> 
   <td><code>1</code>&nbsp;or&nbsp;<code>MEDIUM</code></td> 
   <td>Length; numeric, lowercase/uppercase, and special characters</td> 
  </tr> 
  <tr> 
   <td><code>2</code>&nbsp;or&nbsp;<code>STRONG</code></td> 
   <td>Length; numeric, lowercase/uppercase, and special characters; dictionary file</td> 
  </tr> 
 </tbody> 
</table>

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。

有时候，只是为了自己测试，不想密码设置得那么复杂，譬如说，我只想设置root的密码为123456。

必须修改两个全局参数：

首先，修改validate\_password\_policy参数的值

mysql> set global validate_password_policy=0;
    Query OK, 0 rows affected (0.00 sec)

这样，判断密码的标准就基于密码的长度了。这个由validate\_password\_length参数来决定。

validate\_password\_length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)

其中，validate\_password\_number\_count指定了密码中数据的长度，validate\_password\_special\_char\_count指定了密码中特殊字符的长度，validate\_password\_mixed\_case\_count指定了密码中大小字母的长度。

这些参数，默认值均为1，所以validate\_password\_length最小值为4，如果你显性指定validate\_password\_length的值小于4，尽管不会报错，但validate\_password\_length的值将设为4。如下所示：

mysql> select @@validate_password_length;
    +----------------------------+
    | @@validate_password_length |
    +----------------------------+
    |                          8 |
    +----------------------------+
    1 row in set (0.00 sec)
    
    mysql> set global validate_password_length=1;
    Query OK, 0 rows affected (0.00 sec)
    
    mysql> select @@validate_password_length;
    +----------------------------+
    | @@validate_password_length |
    +----------------------------+
    |                          4 |
    +----------------------------+
    1 row in set (0.00 sec)

如果修改了validate\_password\_number\_count，validate\_password\_special\_char\_count，validate\_password\_mixed\_case\_count中任何一个值，则validate\_password\_length将进行动态修改。

mysql> select @@validate_password_length;
    +----------------------------+
    | @@validate_password_length |
    +----------------------------+
    |                          4 |
    +----------------------------+
    1 row in set (0.00 sec)
    
    mysql> select @@validate_password_mixed_case_count;
    +--------------------------------------+
    | @@validate_password_mixed_case_count |
    +--------------------------------------+
    |                                    1 |
    +--------------------------------------+
    1 row in set (0.00 sec)
    
    mysql> set global validate_password_mixed_case_count=2;
    Query OK, 0 rows affected (0.00 sec)
    
    mysql> select @@validate_password_mixed_case_count;
    +--------------------------------------+
    | @@validate_password_mixed_case_count |
    +--------------------------------------+
    |                                    2 |
    +--------------------------------------+
    1 row in set (0.00 sec)
    
    mysql> select @@validate_password_length;
    +----------------------------+
    | @@validate_password_length |
    +----------------------------+
    |                          6 |
    +----------------------------+
    1 row in set (0.00 sec)

当然，前提是validate\_password插件必须已经安装，MySQL5.7是默认安装的。

那么如何验证validate\_password插件是否安装呢？可通过查看以下参数，如果没有安装，则输出将为空。

原文地址： [https://www.cnblogs.com/ivictor/p/5142809.html][https_www.cnblogs.com_ivictor_p_5142809.html]

[https_www.cnblogs.com_ivictor_p_5142809.html]: https://www.cnblogs.com/ivictor/p/5142809.html

Linux环境下修改密码报ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

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