Github遇到Permanently added the RSA host key for IP address '52.74.223.119' to the list of known hosts.

警告：为IP地址192.30.252.128的主机（RSA连接的）持久添加到hosts文件中，那就来添加吧！

解决办法：

　　vim /etc/hosts

添加一行：52.74.223.119　github.com