mysql - 似乎解决了，但为什么呢？当通过一些 SSH 会话连接到远程 mysql 时，它总是在大约 5 分钟 ~ 10 分钟空闲时失去连接

Question

我有一个远程 MySQL 服务器。虽然超时变量是 8 小时。它将在大约 10 分钟后断开连接。如下。（当出现断开连接的提示时，有铃声。）

$ mysql -hxxx.xxx.xxx.xxx -uxxxxx -p -A
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 35
Server version: 5.7.19-log MySQL Community Server (GPL)

Copyright (c) 2000, 2020, 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 global variables like '%timeout';
+-----------------------------+----------+
| Variable_name               | Value    |
+-----------------------------+----------+
| connect_timeout             | 10       |
| delayed_insert_timeout      | 300      |
| have_statement_timeout      | YES      |
| innodb_flush_log_at_timeout | 1        |
| innodb_lock_wait_timeout    | 50       |
| innodb_rollback_on_timeout  | OFF      |
| interactive_timeout         | 28800    |
| lock_wait_timeout           | 31536000 |
| net_read_timeout            | 30       |
| net_write_timeout           | 60       |
| rpl_stop_slave_timeout      | 31536000 |
| slave_net_timeout           | 60       |
| wait_timeout                | 28800    |
+-----------------------------+----------+
13 rows in set (0.02 sec)

mysql> show variables like '%timeout';
+-----------------------------+----------+
| Variable_name               | Value    |
+-----------------------------+----------+
| connect_timeout             | 10       |
| delayed_insert_timeout      | 300      |
| have_statement_timeout      | YES      |
| innodb_flush_log_at_timeout | 1        |
| innodb_lock_wait_timeout    | 50       |
| innodb_rollback_on_timeout  | OFF      |
| interactive_timeout         | 28800    |
| lock_wait_timeout           | 31536000 |
| net_read_timeout            | 30       |
| net_write_timeout           | 60       |
| rpl_stop_slave_timeout      | 31536000 |
| slave_net_timeout           | 60       |
| wait_timeout                | 28800    |
+-----------------------------+----------+
13 rows in set (0.01 sec)
mysql> show databases;
ERROR 2013 (HY000): Lost connection to MySQL server during query
mysql> show databases;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:    597
Current database: *** NONE ***

+--------------------+
| Database           |
+--------------------+
| information_schema |
| xxxxxxx            |
| xxxxxxx            |
+--------------------+
3 rows in set (0.15 sec)

更新：感谢@scaisEdge 的建议。我发现了奇怪的事情：

如果我以这种方式连接它，我会遇到这个问题：（1）通过 Windows 7 上的 SecureCRT SSH 到这个 Windows 7 上的 VMWare VM CentOS 7.3（2）mysql -hxxx.xxx.xxx.xxx -uxxxxx -p -A

如果我以这种方式连接它，问题就会消失：（1）通过 Windows 7 上的 SecureCRT SSH 到此 Windows 7 上的 VMWare VM CentOS 7.3（2）ssh [e-mail]（3）mysql -hxxx。 xxx.xxx.xxx -uxxxxx -p -A

当然，我可以将步骤（3）改为： MySQL -h127.0.0.1 -uxxxxx -p -A

注意：我跳几次的原因是Windows平台上的MySQL CLI客户端不如Linux上的好。

虽然好像解决了，但是很奇怪。为什么？

有高手能给我一些建议吗？非常感谢！

标签： mysqltimeout