MySQL连接控制插件介绍

mysql> INSTALL PLUGIN CONNECTION_CONTROL SONAME 'connection_control.so';
Query OK, 0 rows affected (0.04 sec)

mysql> INSTALL PLUGIN CONNECTION_CONTROL_FaiLED_LOGIN_ATTEMPTS SONAME 'connection_control.so';
Query OK, 0 rows affected (0.01 sec)

mysql> SELECT
    -> PLUGIN_NAME,PLUGIN_STATUS 
    -> FROM
    -> INFORMATION_SCHEMA.PLUGINS 
    -> WHERE
    -> PLUGIN_NAME LIKE 'connection%';
+------------------------------------------+---------------+
| PLUGIN_NAME                              | PLUGIN_STATUS |
+------------------------------------------+---------------+
| CONNECTION_CONTROL                       | ACTIVE        |
| CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS | ACTIVE        |
+------------------------------------------+---------------+

mysql> show variables like 'connection_control%';
+-------------------------------------------------+------------+
| Variable_name                                   | Value      |
+-------------------------------------------------+------------+
| connection_control_failed_connections_threshold | 3          |
| connection_control_max_connection_delay         | 2147483647 |
| connection_control_min_connection_delay         | 1000       |
+-------------------------------------------------+------------+

mysql> show variables like 'connection_control%';
+-------------------------------------------------+------------+
| Variable_name                                   | Value      |
+-------------------------------------------------+------------+
| connection_control_failed_connections_threshold | 10         |
| connection_control_max_connection_delay         | 2147483647 |
| connection_control_min_connection_delay         | 60000      |
+-------------------------------------------------+------------+
3 rows in set (0.01 sec)

mysql> SELECT * FROM information_schema.CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS;
Empty set (0.00 sec)

[root@localhost ~]# mysql -utestuser -p123
mysql: [Warning] Using a passWord on the command line interface can be insecure.
ERROR 1045 (28000): Access denied for user 'testuser'@'localhost' (using password: YES)

mysql> SELECT * FROM information_schema.CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS;
+----------------+-----------------+
| USERHOST       | FAILED_ATTEMPTS |
+----------------+-----------------+
| 'testuser'@'%' |               1 |
+----------------+-----------------+
1 row in set (0.00 sec)

# 当连续失败次数超过阈值后 再次进行连接会产生延迟 即延迟一定时间后才会返回密码是否正确
mysql> SELECT * FROM information_schema.CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS;
+----------------+-----------------+
| USERHOST       | FAILED_ATTEMPTS |
+----------------+-----------------+
| 'testuser'@'%' |              10 |
+----------------+-----------------+
mysql> show processlist;
+---------+----------+--------------------+--------------------+---------+-------+--------------------------------------+------------------+
| Id      | User     | Host               | db                 | Command | Time  | State                                | Info             |
+---------+----------+--------------------+--------------------+---------+-------+--------------------------------------+------------------+
| 1817003 | root     | localhost          | NULL               | Query   |     0 | starting                             | show processlist |
| 1817091 | testuser | localhost          | NULL               | Connect |    16 | Waiting in connection_control plugin | NULL             |
+---------+----------+--------------------+--------------------+---------+-------+--------------------------------------+------------------+