为不同GitHub账户创建不同的SSH密钥

首先确保当前目录为.ssh

$ cd ~/.ssh

生成不同GitHub账户对应的ssh密钥

$ ssh-keygen -t ed25519 -C "your_email@example.com" -f "github-username"

# If you are using a legacy system that doesn't support the Ed25519 algorithm, use:
$ ssh-keygen -t rsa -b 4096 -C "your_email@example.com" -f "github-username"

-C stands for comment to help identify your ssh key
-f stands for the file name where your ssh key get saved

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

添加密钥到ssh-agent

$ ssh-add ~/.ssh/github-username

添加公钥至GitHub

1. 将公钥内容复制到剪切板

$ pbcopy < ~/.ssh/github-username.pub

2. 粘贴到GitHub

• Settings > SSH and GPG keys > New SSH Key
• 填写title并粘贴公钥

配置ssh config

打开~/.ssh/config

# Default github account: github-username
Host github.com
   HostName github.com
   IdentityFile ~/.ssh/github-username
   IdentitiesOnly yes

# Other github account: another-github-username
Host github-another-github-username
   HostName github.com
   IdentityFile ~/.ssh/another-github-username
   IdentitiesOnly yes

测试连接

$ ssh -T git@github.com
$ ssh -T git@github.com-another-github-username

正常情况将会看到👇

> Hi github-username! You've successfully authenticated, but GitHub does not provide shell access.
> Hi another-github-username! You've successfully authenticated, but GitHub does not provide shell access.

如何使用

$ git clone git@github.com-{your-username}:{owner-user-name}/{the-repo-name}.git
# [e.g.] git clone git@github.com-github-username:github-username/TestRepo.git

为了确保使用正确的账号进行commits和push，需要在每个仓库配置user.email和user.name

$ git config user.email "your_email@example.com"
$ git config user.name "github username"

参考

How To Work With Multiple Github Accounts on a single Machine
Generating a new SSH key and adding it to the ssh-agent
Using multiple github accounts with ssh keys