解决mysql日志显示时间和“Got an error reading communication packets” 问题

[root@calldb3 data]# tail -f mysql.error
2018-11-26T22:13:12.884160Z 4928033 [Note] Aborted connection 4928033 to db: 'calldb' user: 'call' host: '172.31.50.220' (Got an error reading communication packets)
2018-11-26T22:13:12.884160Z 4928083 [Note] Aborted connection 4928083 to db: 'calldb' user: 'call' host: '172.31.50.220' (Got an error reading communication packets)
2018-11-26T22:13:12.884172Z 4848700 [Note] Aborted connection 4848700 to db: 'calldb' user: 'call' host: '172.31.50.220' (Got an error reading communication packets)
2018-11-26T22:13:21.228059Z 4771072 [Note] Aborted connection 4771072 to db: 'calldb' user: 'call' host: '172.31.50.221' (Got an error reading communication packets)
2018-11-26T22:13:21.228081Z 4926711 [Note] Aborted connection 4926711 to db: 'calldb' user: 'call' host: '172.31.50.221' (Got an error reading communication packets)
2018-11-26T22:13:21.228084Z 4928159 [Note] Aborted connection 4928159 to db: 'calldb' user: 'call' host: '172.31.50.221' (Got an error reading communication packets)
2018-11-26T22:13:21.228213Z 4926592 [Note] Aborted connection 4926592 to db: 'calldb' user: 'call' host: '172.31.50.221' (Got an error reading communication packets)
2018-11-27T00:23:08.438660Z 4968411 [Note] Aborted connection 4968411 to db: 'calldb' user: 'call' host: 'vpn.g5air.com' (Got timeout reading communication packets)
2018-11-27T00:23:24.822669Z 4968419 [Note] Aborted connection 4968419 to db: 'calldb' user: 'call' host: 'vpn.g5air.com' (Got timeout reading communication packets)

mysql> show variables like '%log_time%';
+----------------+-------+
| Variable_name  | Value |
+----------------+-------+
| log_timestamps | UTC   |
+----------------+-------+
1 row in set (0.00 sec)

注意到日志时间显示不正确，故需改成北京时间

mysql> SET GLOBAL log_timestamps = SYSTEM;
Query OK, 0 rows affected (0.00 sec)

mysql> show variables like '%log_time%';
+----------------+--------+
| Variable_name  | Value  |
+----------------+--------+
| log_timestamps | SYSTEM |
+----------------+--------+
1 row in set (0.00 sec)

修改之后如下。日志好看多了

2018-11-27T09:23:11.153618+08:00 4974498 [Note] Aborted connection 4974498 to db: 'hcalldb' user: 'hcall' host: '172.31.86.43' (Got an error reading communication packets)
2018-11-27T09:26:22.312188+08:00 4974583 [Note] Aborted connection 4974583 to db: 'hcalldb' user: 'hcall' host: '172.31.86.43' (Got an error reading communication packets)

解决 “Got an error reading communication packets” 问题

mysql> show global status like '%abort%';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| Aborted_clients  | 6644  |
| Aborted_connects | 66042 |
+------------------+-------+
2 rows in set (0.00 sec)

　　

Aborted_clients #表示有一个连接的mysql客户端被连接被kill的数量，MYSQL认为读到了一个错误的包，并将该连接Aborted

模拟：

在linux下打开多个客户端，每个客户端登录mysql，然后我们在其中的一个linux客户端下，强制kill其他mysql客户端登录进程，同时监控error_log情况，即可出现上面日志情况。

Aborted_connects #表示有客户端因为密码或其他什么原因登录失败的数量