Github 的POSSIBLE DNS SPOOFING DETECTED处理

 长时间没用Github了，在git push origin master 时，出现：

  WARNING: POSSIBLE DNS SPOOFING DETECTED! 

解决方案：
1:   cd ~/.ssh

    把known_hosts里github那行信息，删除或者注视掉（我选择了注释掉）
2:再运行 　git push origin master 出现：
     The authenticity of host 'github.com (*)' can't be established.
ECDSA key fingerprint is ****.
Are you sure you want to continue connecting (yes/no)? 
Please type 'yes' or 'no': yes
Warning: Permanently added 'github.com,***' (ECDSA) to the list of known hosts.
[e-mail]: Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.

3: 上述问题，需要在Github上更新公钥。更新后再运行就好了。