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本文参考自：http://yijiebuyi.com/blog/f18d38eb7cfee860c117d629fdb16faf.html
生成不同的Key

  1. 执行如下命令生成一个key, 并指定其名字为 id_ras_aaa （否则为默认的id_ras，并会覆盖之前的值）
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$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):/root/.ssh/id_rsa_aaa
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa_aaa.
Your public key has been saved in /root/.ssh/id_rsa_aaa.pub.
The key fingerprint is:
9b:92:f6:1f:d2:72:bd:72:19:45:42:5f:e4:65:33:64 root@AY140122145815620396Z
The key's randomart image is:
+--[ RSA 2048]----+
|           .. .E=|
|            ..o++|
|             o. .|
|              .  |
|        S    .   |
|       . + ..    |
|      + = + .o   |
|     . o +..o.   |
|        ...o.    |
+-----------------+

公私钥文件放在 ~/.ssh文件夹下。同样操作，可以生成 id_ras_bbb

1.查看系统ssh-key代理，

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$ ssh-add -l
Could not open a connection to your authentication agent.
如果发现上面的提示,说明系统代理里没有任何key,执行如下操作
exec ssh-agent bash

2.添加私钥至 ssh-agent

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$ ssh-add ~/.ssh/id_rsa_aaa
$ ssh-add ~/.ssh/id_rsa_bbb

3.打开github 或者 开源中国 ssh 管理页面把 对应的公钥提交保存到代码管理服务器 (.pub 结尾)

4.在 ~/.ssh 目录创建或修改 config 配置文件:

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`#aaa  (github 配置)
``Host aaa
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_rsa_aaa
` #bbb  (开源中国 配置)
	Host bbb
    HostName git.oschina.net
    User git
    IdentityFile ~/.ssh/id_rsa_bbb
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