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。
【问题】
mysql执行授权设置密码报错：
mysql> grant all on jumpserver.* to 'jumpserver'@'%' identified by 'weakPassword';
ERROR (HY000): Your password does not satisfy the current policy requirements
【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 |
+----------------------------+
row in set (0.00 sec) mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+--------+
| Variable_name | Value |
+--------------------------------------+--------+
| validate_password_dictionary_file | |
| validate_password_length | |
| validate_password_mixed_case_count | |
| validate_password_number_count | |
| validate_password_policy | MEDIUM |
| validate_password_special_char_count | |
+--------------------------------------+--------+
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=;
Query OK, rows affected (0.05 sec)
mysql>
mysql>
mysql> set global validate_password_mixed_case_count=;
Query OK, rows affected (0.00 sec)
mysql> set global validate_password_number_count=;
Query OK, rows affected (0.00 sec)
mysql> set global validate_password_special_char_count=;
Query OK, rows affected (0.00 sec)
mysql> set global validate_password_length=;
Query OK, rows affected (0.00 sec)
mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+-------+
| Variable_name | Value |
+--------------------------------------+-------+
| validate_password_dictionary_file | |
| validate_password_length | |
| validate_password_mixed_case_count | |
| validate_password_number_count | |
| validate_password_policy | LOW |
| validate_password_special_char_count | |
+--------------------------------------+-------+
rows in set (0.00 sec)
4）修改简单密码：
mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('');
Query OK, rows affected, warning (0.00 sec)