Debezium系列之：记录一次命令行可以访问mysql数据库，但是debezium connector无法访问数据库原因排查

一、背景

• debezium connector采集的数据库突然报错，错误是无法访问数据库，错误如下所示

Connector configuration is invalid and contains the following 1 
error(s):\nUnable to connect: Communications link failure\n\n
The last packet sent successfully to the server was 0 
milliseconds ago. The driver has not received any packets 
from the server

二、排查定位问题

步骤一：首先验证debeziu