Mysql5.7.21 centos7 remote connection has been unable to connect, various methods have been tried

https://www.jianshu.com/p/8fc.

including all the methods above in this link, have tried, or can not connect, anxious, for several days, please have a look?

Mar.03,2021

1, can I ping this host locally?
2, can I locally telnet port 3306 of this host?
3, how about replacing bind-address = 127.0.0.1 with bind-address = 0.0.0.0 ?

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