MySQL 出现 Host is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'

一大早要连到我的服务器，出现这个错误。
难道是因为我之前把 root 远程连接给关了，提示不对呀，看来是太多连接错误被阻止了。

解除方式，修改，默认只有 10
max_connect_errors=1000

那么问题来了，以后如何避免呢？
TODO
等以后知道了再补充。

参考：
MySQL 连接出错 mysqladmin flush-hosts 解决方法
https://blog.mimvp.com/article/8852.html

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