Aborted_connects很高分析

mysqladmin ext | grep Abort| Aborted_clients                | 44458        || Aborted_connects               | 546857        |

最近发现服务器这个两个值很高，没过几分钟就增长几十，查看手册

If a client successfully connects but later disconnects improperly or is terminated, the server increments theAborted_clients status variable, and logs an Aborted connection message to the error log. The cause can be any of the following:

• The client program did not call mysql_close() before exiting.

• The client had been sleeping more than wait_timeout or interactive_timeout seconds without issuing any requests to the server. SeeSection 5.1.4, “Server System Variables”.

• The client program ended abruptly in the middle of a data transfer.

If a client is unable even to connect, the server increments the Aborted_connects status variable. Unsuccessful connection attempts can occur for the following reasons:

• A client does not have privileges to connect to a database.

• A client uses an incorrect password.

• A connection packet does not contain the right information.

• It takes more than connect_timeout seconds to get a connect packet. SeeSection 5.1.4, “Server System Variables”.

跟踪--使用tcpdump

tcpdump -s 1500 -w tcp.out port 3306

开另一个窗口，tail -f tcp.out | strings   可以看到有连接错误信息

strings tcp.out > tcp.txt

vim tcp.txt

可以看到具体的信息

Host 'XXX.XX.XX.XXX' is not allowed to connect to this MySQL serverAccess denied for user 'root'@'XXX.XX.XX.XXX' (using password: YES)0N