1.安装Git

sudo yum install git

2.配置姓名和邮箱

git config --global user.name "Firstname Lastname"
git config --global user.email "your_email@email.com"

Firstname Lastname和your_email@email.com为自定义内容
查看配置信息是否成功

cat ~/.gitconfig

成功配置后，显示如下输出

[user]
    name = Firstname Lastname
    email = your_email@email.com

3.设置SSH Key

在设置SSH key之前需要前往Github官网(http://github.com)注册一个Github账户。
运行下面命令创建SSH Keys

[peko@localhost ~]$  ssh-keygen -t rsa -C "your_email@email.com"
Generating public/private rsa key pair.
Enter file in which to save the key (/home/peko/.ssh/id_rsa):    #回车默认  
Created directory '/home/peko/.ssh'.
Enter passphrase (empty for no passphrase): #输入密码 
Enter same passphrase again: #再次输入密码

your_email@email.com改成自己的邮箱地址
输入密码以后生成如下

Your identification has been saved in /home/peko/.ssh/id_rsa.    #私有密钥
Your public key has been saved in /home/peko/.ssh/id_rsa.pub. #公开密钥
The key fingerprint is:
SHA256:rYpYFp/gnaWz/V1YWMFV0sWemPA/W8KSjuIHruBMLqI your_email@email.com
The key's randomart image is:
+---[RSA 2048]----+
|             .o+*|
|           .  .oo|
|            o +..|
|         .   * ..|
|    o   S . .oo  |
|   . = =..  oooo.|
|    * B... o....+|
|. .O o =o o... . |
|E...= +oo+. .    |
+----[SHA256]-----+

id_rsa文件是私有密钥，id_rsa.pub是公开密钥

4.添加公开密钥

在GitHub中添加公开密钥，使用私有密钥进行认证
点击右上角的的Settings选项，选中SSH and GPG keys

配置界面
点击右上角的New SSH key添加密钥
添加密钥
Title栏中输入适当的密钥名称
Key则需要将刚才生成的公共密钥内容复制进去
查看id_rsa.pub文件中的内容

cat ~/.ssh/id_rsa.pub
ssh-ras 密钥内容 your_email@email.com

将ssh-ras 密钥内容 your_email@email.com的内容全部复制到Key中
单击添加按钮完成添加

5.进行认证

ssh -T git@github.com
The authenticity of host 'github.com (13.250.177.223)' can't be established.
RSA key fingerprint is *** #fingerprint值
RSA key fingerprint is *** #fingerprint值
Are you sure you want to continue connecting (yes/no)? #输入yes

成功后出现如下结果

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