MySQL令人头疼的Aborted告警案例分析

案例1

这里我故意输入错误的密码5次，来看下数据库的error log和Aborted的哪个参数记载了这一问题

[root@HE3~]# mysql -uroot -pwrongpass -h127.0.0.1
ERROR 1045 (28000): Access denied for user 'root'@'127.0.0.1' (using password: YES)
[root@HE3~]# mysql -uroot -pwrongpass -h127.0.0.1
ERROR 1045 (28000): Access denied for user 'root'@'127.0.0.1' (using password: YES)
[root@HE3~]# mysql -uroot -pwrongpass -h127.0.0.1
ERROR 1045 (28000): Access denied for user 'root'@'127.0.0.1' (using password: YES)
[root@HE3~]# mysql -uroot -pwrongpass -h127.0.0.1
ERROR 1045 (28000): Access denied for user 'root'@'127.0.0.1' (using password: YES)
[root@HE3~]# mysql -uroot -pwrongpass -h127.0.0.1
ERROR 1045 (28000): Access denied for user 'root'@'127.0.0.1' (using password: YES)


可以看出，这里的Aborted_connects 记录了密码错误的这一问题

mysql>show global status like 'aborted%';

+------------------+-------+
|Variable_name    | Value |
+------------------+-------+
|Aborted_clients  | 19    |
|Aborted_connects | 5     |
+------------------+-------+
2 rows inset (0.00 sec)

error log中，也记载了这类密码输错的信息

[Warning] Access denied for user'root'@'127.0.0.1' (using password: YES)
[Warning] Access denied for user 'root'@'127.0.0.1' (using password:YES)
[Warning] Access denied for user 'root'@'127.0.0.1' (using password:YES)
[Warning] Access denied for user 'root'@'127.0.0.1' (using password:YES)
[Warning] Access denied for user 'root'@'127.0.0.1' (using password:YES)


案例2

接下来我们看下文章第三节提到的两个重点参数对数据库连接的行为影响

这里我们将这两个参数均配置为10秒

mysql>set global wait_timeout=10;
Query OK,0 rows affected (0.00 sec)
 
mysql>set global interactive_timeout=10;
Query OK,0 rows affected (0.00 sec)
mysql>show processlist;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect... Connection id: 79 Current database: *** NONE ***
 
+----+------+-----------------+------+---------+------+-------+------------------+
| Id |User | Host            | db   | Command | Time | State | Info             |
+----+------+-----------------+------+---------+------+-------+------------------+
| 79 |root | 127.0.0.1:42016 | NULL | Query  |    0 | NULL  | show processlist |
+----+------+-----------------+------+---------+------+-------+------------------+
1 row in set (0.00 sec)

这里三次操作，可以看到clients数上升，这是由于timeout参数控制的，已经连接上数据的连接被杀掉。

mysql>show global status like 'aborted%';
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect... Connection id:    81 Current database: *** NONE ***
 
+------------------+-------+
|Variable_name    | Value |
+------------------+-------+
|Aborted_clients  | 22    |
|Aborted_connects | 5     |
+------------------+-------+
2 rows in set (0.01 sec)


error log中记载的是

[Warning] Aborted connection 81 to db: 'unconnected' user: 'root' host: '127.0.0.1' (Got timeout reading communication packets)
[Warning] Aborted connection 78 to db: 'unconnected' user: 'root' host: '127.0.0.1' (Got timeout reading communication packets)
[Warning] Aborted connection 79 to db: 'unconnected' user: 'root' host: '127.0.0.1' (Got timeout reading communication packets)

本文摘自 http://suifu.blog.51cto.com/9167728/1942302