github怎么创建ssh key

github的ssh配置如下：
一 、
设置git的user name和email：
$ git config --global user.name "xuhaiyan"
$ git config --global user.email "haiyan.xu.vip@gmail.com"

二、生成SSH密钥过程：
1.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
2.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

3.添加密钥到ssh：ssh-add 文件名
需要之前输入密码。
4.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/ ，登陆xuhaiyan825，然后添加ssh。

5.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.

1，在本地生产public_key，在终端执行命令：ssh-keygen -t rsa -b 4096 -C "your_email@example.com"

2，粘贴到 https://github.com/settings/keys，在右上方又一个“New SSH Key”按钮，点击新增，把在本地的public_key复制上去，标题任意。
3，点击保存即可。

详细请参考：https://help.github.com/articles/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent/