암호화 키 생성

# sshのセッティングディレクトリに移動
$cd ~/.ssh

# 暗号鍵を生成
$ ssh-keygen -t rsa
# Generating public/private rsa key pair.
# Enter file in which to save the key (/Users/(username)/.ssh/id_rsa): id_git_rsa
# Enter passphrase (empty for no passphrase):
# Enter same passphrase again:

GitHub에 공개 키 업로드

ssh 연결 설정

Host github
  HostName github.com
  IdentityFile ~/.ssh/main_rsa
  User git
  Port 22
  TCPKeepAlive yes
  IdentitiesOnly yes

Host github-sub
  HostName github.com
  IdentityFile ~/.ssh/sub_rsa
  User git
  Port 22
  TCPKeepAlive yes
  IdentitiesOnly yes

github에 대한 ssh 연결 확인

# ssh接続確認 （<HOST NAME>には「github-sub」などが入る）
$ ssh -T <HOST NAME>
# Hi ******! You've successfully authenticated, but GitHub does not provide shell access.

# git cloneを実行 （ssh用のURLをコピーし、HOST NAMEを書き換える）
$ git clone <HOST NAME>:******/******.git

참고