创建SSH密钥

Step1: 检查SSH密钥

首先，打开终端，输入以下指令，查看是否已经生成SSH密钥。

cd ~/.ssh

ls

# Lists the files in your .ssh directory

在输入ls后，看看是否有文件 id_rsa.pub 或者 id_dsa.pub，或者两者皆有。如果已经存在这两个文件，则不需进行Step 2，之前如果输入了密码，可以直接跳过Step3。

Step2: 生成新的SSH密钥

输入下面的第一条指令，指令中输入一个邮箱，会出现要你自己定义一个文件来保存Key，直接Enter通过。

ssh-keygen -t rsa -C "your_email@example.com"

# Creates a new ssh key, using the provided email as a label

# Generating public/private rsa key pair.

# Enter file in which to save the key (/home/you/.ssh/id_rsa):

输入密码（不能少于4个，否则重输入）。

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

# Enter same passphrase again: [Type passphrase again]

终端给出的信息如下，告诉Key的保存位置，后面需要用到。

# 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

Step3: 添加SSH Key到GitHub

运行下面这些指令：（打了#号的不用，）。

sudo apt-get install xclip

# Downloads and installs xclip. If you don't have `apt-get`, you might need to use another installer (like `yum`)

xclip -sel clip < ~/.ssh/id_rsa.pub

# Copies the contents of the id_rsa.pub file to your clipboard

进入网站GitHub，对以下进行设置：

1.      点击账户设置（很明显的，就在右上角）；

2.      点击 "SSHKeys" 在左边；

3.      工作区出现

点击Add SSH key，出现下面。

4.      点击 "Add key"

5.      输入密码进行确认，这个密码就是在Step 3中输入的密码，这个弹出窗口会在输入

xclip -sel clip < ~/.ssh/id_rsa.pub

指令是出现。

Step4: 测试是否成功

ssh -T git@github.com

# Attempts to ssh to github

输入上面的指令，而且指令中的git@github.com是不可以随意输的，一般就是这个，其实也就是这个。

可能出现的错误信息:

...

Agent admitted failure to sign using the key.

debug1: No more authentication methods to try.

Permission denied (publickey).

警告:

# 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)?

莫担心，没事的，输入yes，直接秒杀。

# Hi username! You've successfully authenticated, but GitHub does not

# provide shell access.

成功的是：

If that username is correct, you've successfully set up your SSH key. Don't worry about the shell access thing, you don't want that anyway.