MySQL validate_password_policy unknown system variable - mysql

Question

I'm using MySQL 5.7.25 and i want to increase my MySQL password policy by doing this in MySQL command:
SET GLOBAL validate_password_policy=2;
But i always get an error:
ERROR 1193 (HY000): Unknown system variable 'validate_password_policy'
I tried to list the validate_password variable:
SHOW VARIABLES LIKE 'validate_password%'
but it always return empty set

Answer 1

This problem has happened because validate_password plugin is by default NOT activated. You can solve by these commands:
mysql> select plugin_name, plugin_status from information_schema.plugins where plugin_name like 'validate%';
Empty set (0.00 sec)
mysql> install plugin validate_password soname 'validate_password.so';
Query OK, 0 rows affected (0.02 sec)
mysql> select plugin_name, plugin_status from information_schema.plugins where plugin_name like 'validate%';
Finally, you will show the following:
+-------------------+---------------+
| plugin_name | plugin_status |
+-------------------+---------------+
| validate_password | ACTIVE |
+-------------------+---------------+
1 row in set (0.00 sec)
Then you can run your command:
mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+--------+
| Variable_name | Value |
+--------------------------------------+--------+
| validate_password_check_user_name | OFF |
| 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 |
+--------------------------------------+--------+
7 rows in set (0.00 sec).

Answer 2

This command works for me. I'm using MySQL 8.
SET GLOBAL validate_password.policy=LOW;

Answer 3

SET GLOBAL validate_password_policy=LOW;
Replace validate_password(dot)policy with validate_password_policy