mysql 设置密码出现ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

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，默认是/var/log/mysqld.log
获取随机密码：
grep “password” /var/log/mysqld.log

[root@instance-2lfpjykx ~]# mysql -uroot -p
输入随机密码登入mysql

修改用户密码
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'xxxxxx';

出现错误：ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

这个与validate_password_policy的值有关，修改为一个简单的密码，会报以上错误。

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。
不想密码设置得那么复杂，如只想设置root的密码为123456
设置
set global validate_password_policy=0;
现在密码只需符合长度限制

validate_password_length参数默认为8，它有最小值的限制，最小值为：
Length = 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。

mysql> set global validate_password_length = 6;
Query OK, 0 rows affected (0.00 sec)mysql> select @@validate_password_length;
+----------------------------+
| @@validate_password_length |
+----------------------------+
|                          6 |
+----------------------------+

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