首先呢，我已经弄好了ssh的密钥，ssh -T git@githun.com是可以的，返回：
Hi xxxxxx! You've successfully authenticated, but GitHub does not provide shell access.
但是，当我想要git push的时候，总是失败，提示是：
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
FATAL Something's wrong. Maybe you can find the solution here: xxxxxxxxxxxx
请问这是什么情况，
我执行的是
git remote add origin git@github.com:xxxxxxx/test.git
git push -u origin master
设置Git的user name和email
git config --global user.name "yourname"
git config --global user.email "youremail"生成SSH密钥
查看是否已经有了ssh密钥：cd ~/.ssh
如果没有密钥则不会有此文件夹，有则备份删除
生存密钥：
ssh-keygen -t rsa -C “haiyan.xu.vip@gmail.com”
按3个回车，密码为空。
Your identification has been saved in /home/tekkub/.ssh/id_rsa.
Your public key has been saved in /home/tekkub/.ssh/id_rsa.pub.
The key fingerprint is:
………………
最后得到了两个文件：id_rsa和id_rsa.pub添加密钥到ssh：ssh-add 文件名,需要之前输入密码.
在github上添加ssh密钥，这要添加的是“id_rsa.pub”里面的公钥。
打开https://github.com/,在设置中添加密钥
测试：ssh git@github.com
The authenticity of host ‘github.com (207.97.227.239)’ can’t be established.
RSA key fingerprint is 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added ‘github.com,207.97.227.239′ (RSA) to the list of known hosts.
ERROR: Hi tekkub! You’ve successfully authenticated, but GitHub does not provide shell access
Connection to github.com closed.
测试成功就可以push code了.