git:could not open a connection to your authentication agent
错误：
vagrant@homestead:~/Code/sample$ git push -u origin master
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
先执行 eval `ssh-agent`
再执行 ssh-add ~/.ssh/rsa
上面有可能会找不到路径
vagrant@homestead:~/Code/sample$ ssh-add ~/.ssh/id_key
/home/vagrant/.ssh/id_key: No such file or directory
切换到秘钥目录在执行就行了
vagrant@homestead:~$ cd .ssh/
vagrant@homestead:~/.ssh$ ssh-add ~/.ssh/id_rsa
成功：Identity added: /home/vagrant/.ssh/id_rsa (/home/vagrant/.ssh/id_rsa)
文章来源：刘俊涛的博客
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