Laravel 可以正常使用，数据库连接成功，但是偶尔会出现 SQLSTATE[HY000] [2002]

Laravel 可以正常使用，数据库连接成功，但是偶尔会出现 SQLSTATE[HY000] [2002] Connection refused！

查看了 Mysql 的 error log 并没有相关提示。。。。没告诉我为什么无法连接

2021-07-28T09:43:25.742617Z 0 [Warning] [MY-010915] [Server] 'NO_ZERO_DATE', 'NO_ZERO_IN_DATE' and 'ERROR_FOR_DIVISION_BY_ZERO' sql modes should be used with strict mode. They will be merged with strict mode in a future release.
2021-07-28T09:43:25.745058Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.23) starting as process 14344
2021-07-28T09:43:25.763705Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2021-07-28T09:43:28.695256Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2021-07-28T09:43:29.258933Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
2021-07-28T09:43:29.340308Z 0 [System] [MY-010229] [Server] Starting XA crash recovery...
2021-07-28T09:43:29.350397Z 0 [System] [MY-010232] [Server] XA crash recovery finished.
2021-07-28T09:43:29.453964Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2021-07-28T09:43:29.454307Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
2021-07-28T09:43:29.486766Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.23'  socket: '/BigData/mysql/mysql.sock'  port: 3306  MySQL Community Server - GPL.

有时候会出现另一种提示

2021-07-28T10:17:28.110630Z 37 [Warning] [MY-010055] [Server] IP address '172.17.0.2' could not be resolved: Name or service not known

以上两种情况都会导致断开链接，我挨个解决下吧。。

Laravel 是正常运行使用的，当进行到一个比较复杂的情况时就会出现这个情况，应该怎么定位解决呢？
请大家指点我一下，非常非常感谢！！！