使用環(huán)境:

• 關(guān)于同一臺Mac電腦下使用多個SSH key 切換使用(或者多用戶使用ssh提交代碼)
• 既可以提交代碼到github，也可以提交代碼到oschina，提交的時候都走ssh協(xié)議，但是默認(rèn)情況下只能有一個ssh key(~/ssh)

生成公鑰、私鑰

$ ssh-keygen -t rsa -C "your_github_email@example.com"
保存到 `~/.ssh/id_rsa_github`

$ ssh-keygen -t rsa -C "your_oschina_email@example.com"
保存到 `~/.ssh/id_rsa_oschina`

配置ssh代理

// 查看系統(tǒng)ssh-key代理
$ ssh-add -l

// 如果系統(tǒng)已經(jīng)有ssh-key 代理 ,執(zhí)行下面的命令可以刪除
$ ssh-add -D

// 把 ~/.ssh 目錄下的2個私鑰添加的 ssh-agent
$ ssh-add ~/.ssh/id_rsa_github
$ ssh-add ~/.ssh/id_rsa_oschina

// 在 .ssh 目錄創(chuàng)建 config 配置文件
$ vim ~/.ssh/config
#  github 配置
Host github
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_rsa_github

# oschina配置
Host oschina
    HostName git.oschina.net
    User git
    IdentityFile ~/.ssh/id_rsa_oschina

or

#aaa  (github 配置)
Host aaa
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_rsa_aaa

#bbb  (開源中國 配置)
Host bbb
    HostName git.oschina.net
    User git
    IdentityFile ~/.ssh/id_rsa_bbb

#ccc
........

記住上面一步 Host 里設(shè)置的別名

驗證

// 查看ssh-key代理，會看到2條記錄
$ ssh-add -l

// 訪問github
$ ssh -T git@github.com
Hi 用戶名! You have successfully authenticated, but GitHub does not provide shell access.

// 訪問oschina
$ ssh -T git@git.oschina.net
Welcome to Git@OSC, 用戶名!

or

// 訪問aaa
$ ssh -T aaa

連接失敗 (Permission denied (publickey).)

$ ~ ssh -T papillon        
The authenticity of host 'gitlab.com (52.167.219.168)' can't be established.
ECDSA key fingerprint is SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'gitlab.com,52.167.219.168' (ECDSA) to the list of known hosts.
Authentication failed.

$ ~ ssh -T git@gitlab.com        
Permission denied (publickey).

ssh-agent

# 開啟 agent
$ eval $(ssh-agent -s) ←┘
Agent pid 8428

# 添加 鑰匙名
$ ssh-add ~/.ssh/id_rsa_github ←┘
Identity added: /c/Users/user/.ssh/id_rsa_github (/c/Users/user/.ssh/id_rsa_github)

# 查看 agent list
$ ssh-add -l ←┘
8428 SHA256:A9UcJMadwTpF7TvsT5LEXsSssTs5qehmV9Q2Q8Ntw3o /c/Users/user/.ssh/id_rsa_github (RSA)

# 不用時可以關(guān)閉 agent
$ eval $(ssh-agent -k) ←┘
Agent pid 8428 killed

原因是，我們自定義了 id_rsa_github 鑰匙名，默認(rèn)情況下，連接會搜索 id_rsa 鑰匙名，所以這里會失敗
可以通過 ssh -T -v git@github.com 了解連接失敗的具體原因

還有一種簡單的辦法,直接刪除id_rsa鑰匙名，全部使用帶有后綴的格式來寫

$ .ssh ls
config              id_rsa.pub          id_rsa_gat.pub      id_rsa_papillon.pub
id_rsa              id_rsa_gat          id_rsa_papillon     known_hosts
$ .ssh rm id_rsa id_rsa.pub