[root@izwz97j0sus9exlvpgweqpz ~]# git clone git@github.com:easonstudy/xxx.git
Cloning into 'z-base'...
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
1. 检查SSH key是否已经存在
ls ~/.ssh/
进行检查 id_rsa.pub 是否存在，如果存在，就不用生成一个新的SSH key了，直接跳到下面的第3步。
2:不存在.则需要创建
https://baijiahao.baidu.com/s?id=1628034638876029219&wfr=spider&for=pc
3:vim id_rsa.pub. 复制秘钥至 添加至github.com
