使用git clone命令從github上同步github上的代碼庫時，如果使用SSH鏈接（如我自己的beagleOS項 目：git@github.com:DamonDeng/beagleOS.git），而你的SSH key沒有添加到github帳號設置中，系統會報下面的錯誤：

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Permission denied (publickey).

fatal: The remote end hung up unexpectedly

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這時需要在本地創建SSH key，然后將生成的SSH key文件內容添加到github帳號上去。

創建SSH key的方法很簡單，執行如下命令就可以：

ssh-keygen

然后系統提示輸入文件保存位置等信息，連續敲三次回車即可，生成的SSH key文件保存在中～/.ssh/id_rsa.pub

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然后用文本編輯工具打開該文件，我用的是vim,所以命令是：

vim ~/.ssh/id_rsa.pub

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接著拷貝.ssh/id_rsa.pub文件內的所以內容，將它粘帖到github帳號管理中的添加SSH key界面中。

打開github帳號管理中的添加SSH key界面的步驟如下：

1. 登錄github

2. 點擊右上方的Accounting settings圖標

3. 選擇 SSH key

4. 點擊 Add SSH key

在出現的界面中填寫SSH key的名稱，填一個你自己喜歡的名稱即可，然后將上面拷貝的~/.ssh/id_rsa.pub文件內容粘帖到key一欄，在點擊“add key”按鈕就可以了。

添加過程github會提示你輸入一次你的github密碼

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添加完成后再次執行git clone就可以成功克隆github上的代碼庫了。

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來源：http://blog.csdn.net/keyboardota/article/details/7603630

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更權威查看： https://help.github.com/articles/generating-ssh-keys

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      cd ~/.ssh
# Checks to see if there is a directory named ".ssh" in your user directory

ls
# Lists all the subdirectories in the current directory
# config  id_rsa  id_rsa.pub  known_hosts

mkdir key_backup
# Makes a subdirectory called "key_backup" in the current directory

cp id_rsa* key_backup
# Copies the id_rsa keypair into key_backup

rm id_rsa*
# Deletes the id_rsa keypair

ssh-keygen -t rsa -C "your_email@example.com"
# Creates a new ssh key using the provided email
# Generating public/private rsa key pair.
# Enter file in which to save the key (/home/you/.ssh/id_rsa):

Enter passphrase (empty for no passphrase): [Type a passphrase]
Enter same passphrase again: [Type passphrase again]

Your identification has been saved in /home/you/.ssh/id_rsa.
Your public key has been saved in /home/you/.ssh/id_rsa.pub.
The key fingerprint is:
01:0f:f4:3b:ca:85:d6:17:a1:7d:f0:68:9d:f0:a2:db your_email@example.com

sudo apt-get install xclip
# Downloads and installs xclip

xclip -sel clip < ~/.ssh/id_rsa.pub
# Copies the contents of the id_rsa.pub file to your clipboard
    

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1. Go to your Account Settings
2. Click "SSH Keys" in the left sidebar
3. Click "Add SSH key"
4. Paste your key into the "Key" field
5. Click "Add key"
6. Confirm the action by entering your GitHub password

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