先进入已有的 Git 目录或使用新建的一个 Git 仓库下。

设置 Github 用户名和邮箱：

$ git config --global user.name [Github用户名]
$ git config --global user.email [Github认证邮箱]

生成 SSH 密钥文件：

$ ssh-keygen -t rsa -C [Github认证邮箱]
Generating public/private rsa key pair.
Enter file in which to save the key (/home/ubuntu/.ssh/id_rsa): 
[按 Enter 键接受默认文件位置]
Enter passphrase (empty for no passphrase): 
[按 Enter 不设置安全口令, 如果设置, 每次使用 Git 命令时都需要输入]
Enter same passphrase again:
[重复安全口令, 如果上一步没有设置, 按 Enter 跳过]

在 ~/.ssh/ 目录下会创建两个文件：

• id_rsa: 私钥文件
• id_rsa.pub: 公钥文件

将公钥文件内容打印后复制：

$ cat ~/.ssh/id_rsa.pub

登陆 Github 点击 右上角头像 -> Settings -> SSH and GPG keys -> New SSH key 输入以下内容：

• Title: 任意取名
• Key type: Authentication Key
• Key: 复制上一步中的公钥文件内容到此处

点击 Add SSH key 完成创建, 验证 Authentication 是否正常：

$ ssh -T git@github.com
The authenticity of host 'github.com (0.0.0.0)' can't be established.
ED25519 key fingerprint is SHA256:+xxxxxxxxx/xxxxxxxxx.
This key is not known by any other names
Are you sure you want to continue connecting (yes/no/[fingerprint])? 
[选择 yes 使服务器的连接信息保存在系统中]
Warning: Permanently added 'github.com' (ED0000) to the list of known hosts.
Hi [Github用户名]! You've successfully authenticated, but GitHub does not provide shell access.

最后输出 Hi [Github用户名]! You've successfully authenticated, but GitHub does not provide shell access. 就表示配置成功了。