环境：
-
mysql> select version();
-
+------------+
-
| version() |
-
+------------+
-
| 5.7.17-log |
-
+------------+
-
1 row in set (0.00 sec)
-
报错：
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mysql> create user repl@'192.168.100.51' identified by '123456';
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ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
出现这个问题是因为安装了插件，如下：
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mysql> select name,dl from mysql.plugin;
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+-------------------+----------------------+
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| name | dl |
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+-------------------+----------------------+
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| validate_password | validate_password.so |
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+-------------------+----------------------+
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1 row in set (0.00 sec)
具体规则是：
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mysql> SHOW VARIABLES LIKE 'validate_password%';
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+--------------------------------------+--------+
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| Variable_name | Value |
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+--------------------------------------+--------+
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| validate_password_check_user_name | OFF |
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| validate_password_dictionary_file | |
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| validate_password_length | 8 |
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| validate_password_mixed_case_count | 1 |
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| validate_password_number_count | 1 |
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| validate_password_policy | MEDIUM |
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| validate_password_special_char_count | 1 |
-
+--------------------------------------+--------+
插件的安装启用：
1.插件对应的库对象文件需在配置选项plugin_dir指定的目录中。
2.可使用--plugin-load=validate_password.so在server启动时载入插件，或者将plugin-load=validate_password.so写入配置文件。
3.也可以通过如下语句在server运行时载入插件（会注册进mysql.plugins表）mysql> INSTALL PLUGIN validate_password SONAME 'validate_password.so';
为阻止该插件在运行时被删除可在配置文件中添加：
[mysqld]
plugin-load=validate_password.so
validate-password=FORCE_PLUS_PERMANENT
更多信息：
https://dev.mysql.com/doc/refman/5.7/en/validate-password-plugin-installation.html
