新生成密钥的时候，git clone或者push的时候，可能会报这样的错误：
The authenticity of host 'gitee.com (xxx.xxx.xxx.xxx)' can't be established.
ECDSA key fingerprint is SHA256:xxxxxxxxxxxxxxxxxxxxxxxx.
Google之后明白，文件夹内少了一个known_hosts文件，本来密钥文件应该是三个，现在只有两个，便报了这样的错误，此时输入yes回车之后，生成了缺少了的known_hosts文件，便可解决这个问题：
Are you sure you want to continue connecting (yes/no)? //输入yes，回车
Warning: Permanently added 'gitee.com,xxx.xxx.xxx.xxx' (ECDSA) to the list of known hosts.
ssh_packet_read: Connection closed
作者：月泠
链接：https://www.jianshu.com/p/629fefe5468a
来源：简书
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