http://www.th7.cn/db/mysql/201702/225243.shtml
[Note] Aborted connection xxxx to db:
问题现象：在tail -f/data/logs/mysql/error.log日志中出现大量的如下信息(web用的是Zabbix，设置连接超时时间为100秒)：
‘ host: ‘localhost‘ (Got timeout reading communication packets)
2017-02-05T15:30:19.272811+08:00 28546 [Note] Aborted connection 28546 to db: ‘zabbix‘ user: ‘zabbix‘ host: ‘localhost‘ (Got timeout reading communication packets)
2017-02-05T15:30:22.388624+08:00 28547 [Note] Aborted connection 28547 to db: ‘zabbix‘ user: ‘zabbix‘ host: ‘localhost‘ (Got timeout reading communication packets)
2017-02-05T15:30:27.119216+08:00 28554 [Note] Aborted connection 28554 to db: ‘zabbix‘ user: ‘zabbix‘ host: ‘localhost‘ (Got timeout reading communication packets)
解决办法：
修改[[email protected] ~]# grep timeout /etc/my.cnf
interactive_timeout = 120
wait_timeout = 120
log_warnings=1 //注意，我这里原来是2。修改成1后，问题现象果然但是已经不存在了。
在命令行中可以这样修改：
mysql>set global log_warning=1;
mysql>set global interactive_timeout = 120;
mysql>set global wait_timeout = 120;
参数简要说明：
1)interactive_timeout:
参数含义：服务器关闭交互式连接前等待活动的秒数。交互式客户端定义为在mysql_real_connect()中使用CLIENT_INTERACTIVE选项的客户端。
参数默认值：28800秒（8小时）
解决无Notice的办法：
grep timeout /etc/my.cnf innodb_lock_wait_timeout = 60
interactive_timeout = 28800
wait_timeout = 22
grep log_warnings /etc/my.cnflog_warnings=2
From:http://blog.csdn.net/jamesyao008/article/details/45098073
修改后，无效，原因是现在是变成了Notice，不是警告：
tail -f/data/logs/mysql/error.log
2017-02-05T15:38:19.678134+08:00 128 [Note] Aborted connection 128 to db: ‘zabbix‘ user: ‘zabbix‘ host: ‘localhost‘ (Got timeout reading communication packets)
2017-02-05T15:38:22.452504+08:00 131 [Note] Aborted connection 131 to db: ‘zabbix‘ user: ‘zabbix‘ host: ‘localhost‘ (Got timeout reading communication packets)