參考：

https://www.cnblogs.com/xjnotxj/p/5845574.html

http://blog.csdn.net/birdben/article/details/51824788

https://help.github.com/articles/error-permission-denied-publickey/

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1. 兩個賬戶分別生成ssh key

cd ~/.ssh

ssh-keygen -t rsa -C "2453929471@qq.com"

這個文件我叫它: id_rsa_self, 同時會生成一個id_rsa_self.pub

ssh-keygen -t rsa -C "mgao@company.com"

這個文件我叫它: id_rsa_company, 同時會生成一個id_rsa_company.pub

2. 添加私鑰

ssh-agent -s ssh-add ~/.ssh/id_rsa_self ssh-add ~/.ssh/id_rsa_company

3. 分別登錄私人和公司的github，配置ssh-key

將 id_rsa_xxx.pub的內容貼進去

4. 配置 config

cd ~/.ssh

touch config

# self(2453929471@qq.com)

Host github.com

HostName github.com

PreferredAuthentications publickey

IdentityFile ~/.ssh/id_rsa_self

User 2453929471

# company(mgao@company.com)

Host github.company.com

HostName github.com

PreferredAuthentications publickey

IdentityFile ~/.ssh/id_rsa_company

User mgao

5. 測試

?? .ssh ssh -T git@github.company.com

Hi mgao! You've successfully authenticated, but GitHub does not provide shell access.

?? .ssh ssh -T git@github.com ? ? ? ? ? ? ?

Hi 2453929471! You've successfully authenticated, but GitHub does not provide shell access.

注意，我當時這里犯了一個錯誤，就是我用的 mgao@github.company.com去登錄的，然后報publickey的錯誤。

官方文檔寫的很清楚

Always use the "git" user

All connections, including those for remote URLs, must be made as the "git" user. If you try to connect with your GitHub username, it will fail:

ssh -T GITHUB-USERNAME@github.com Permission denied (publickey).

If your connection failed and you're using a remote URL with your GitHub username, you can?change the remote URL to use the "git" user.

You should verify your connection by typing:

ssh -T git@github.com Hi username! You've successfully authenticated...

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