解決方案：

1、reading initial communication packet’ system error 0：

修改my.cnf

找出bind-address = 127.0.0.1 => #bind-address = 127.0.0.1

2、caching-sha2-password Error進入MySQL容器並以root身份登入。

指令：

ALTER USER '帳號'@'%' IDENTIFIED WITH mysql_native_password BY '密碼';

Done.