init-connet设置
注：该参数对超级用户不生效
-- 创建测试库
mysql> create database test;
Query OK, 1 row affected (0.00 sec)
mysql> use test;
Database changed
-- 创建审计记录表
mysql> CREATE TABLE conn_log (
-> conn_id int(11) DEFAULT NULL,
-> conn_time datetime DEFAULT NULL,
-> user_name varchar(128) CHARACTER SET utf8 DEFAULT NULL,
-> cur_user_name varchar(128) CHARACTER SET utf8 DEFAULT NULL,
-> ip varchar(15) CHARACTER SET utf8 DEFAULT NULL,
-> KEY conn_time (conn_time)
-> ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 ;
Query OK, 0 rows affected (0.01 sec)
-- 设置审计内容
mysql> set global init_connect="set @user=user(),@cur_user=current_user();insert into test.conn_log values(connection_id(),now(),@user,@cur_user,'10.0.0.1');"
-> ;
Query OK, 0 rows affected (0.00 sec)
mysql> show variables like '%init%';
+------------------------+-------------------------------------------------------------------------------------------------------------------------------+
| Variable_name | Value |
+------------------------+-------------------------------------------------------------------------------------------------------------------------------+
| init_connect | set @user=user(),@cur_user=current_user();insert into test.conn_log values(connection_id(),now(),@user,@cur_user,'10.0.0.1'); |
| init_file | |
| init_slave | |
| table_definition_cache | 1400 |
+------------------------+-------------------------------------------------------------------------------------------------------------------------------+
4 rows in set (0.00 sec)
-- 创建普通用户
mysql> grant select,insert on dba_test.* to 'test'@'%' identified by 'test';
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
异常
[root@test ~]# mysql -S /data0/mysql57/mysql3307/mysqltmp/mysql3307.sock -utest -ptest
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 117
Server version: 5.7.21-log
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show user();
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 118
Current database: NONE
ERROR 1184 (08S01): Aborted connection 118 to db: 'unconnected' user: 'test' host: 'localhost' (init_connect command failed)
mysql> select user();
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 119
Current database: NONE
异常处理
分析
通过查看erro log发现test用户没有test.conn_log表的写权限，导致init-connect中的sql内容无法进行，
从而导致连接失败
解决
-- 赋权
mysql> grant insert on test.* to 'test'@'%';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
-- 登陆正常
[root@test ~]# mysql -hip地址 -P3307 -utest -ptest
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 140
Server version: 5.7.21-log MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use dba_test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables;
+--------------------+
| Tables_in_dba_test |
+--------------------+
| user |
+--------------------+
1 row in set (0.00 sec)
mysql> insert into user(user_id,username) values(4,'d');
Query OK, 1 row affected (0.00 sec)
mysql>