GitHub_multiple_account

Posted on Edited on In

Setup Multiply Github account via SSH

1. Generate separate SSH keys

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# personal account
ssh-keygen -t ed25519 -C "email@personal_mail.com" -f ~/.ssh/id_personal

#work account
ssh-keygen -t ed25519 -C  "email@work_mail.com"  -f  ~/.ssh/id_rsa_work_user1

it will generate file private and public:

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~/.ssh/id_personal
~/.ssh/id_personal.pub
~/.ssh/id_rsa_work_user1
~/.ssh/id_rsa_work_user1.pub

2. Add public keys to GitHub

  1. GitHub → Settings
  2. SSH and GPG keys
  3. New SSH key
  4. Paste the .pub file content

3. Registering the new SSH Keys with the ssh-agent

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eval "$(ssh-agent -s)"
ssh-add ~/.ssh/id_personal
ssh-add ~/.ssh/id_rsa_work_user1
  • List key: ssh-add -l
  • 刪除則使用: ssh add -d ~/.ssh/id_personal
  • 刪除全部: ssh-add -D

4. confgiure ssh by create SSH config File

  • create ssh config
    Edit config file

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    nano ~/.ssh/config

    or manually create it

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    cd ~/.ssh/
    touch config           // Creates the file if not exists
    code config            // Opens the file in VS code, use any editor

  • change permission: chmod 600 ~/.ssh/config

  • Edit config

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    # Personal account, - the default config
    Host github-personal
       HostName github.com
       User git
       IdentityFile ~/.ssh/id_personal
       IdentitiesOnly yes
    # Work account-1
    Host github-work  
       HostName github.com
       User git
       IdentityFile ~/.ssh/id_rsa_work_user1
       IdentitiesOnly yes

Note:
IdentitiesOnly yes: Use only this key, no guessing. prevents SSH from trying the wrong keys

5. test ssh work

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ssh -T git@github-work  
ssh -T git@github-personal

6. clone use correct ssh host

When git clone you need to change it’s hostname from git@github to setting you se in .ssh/config this distinguish multiply account.

If i was to git clone my repo like below picture which github gave URL git@github.com:jakccl/helloTest.git need to change to git@github-personal. If you only have one account then you can use what github gave git@github.com

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#work
git clone git@github-work:username/repo.git 
#personal
git clone git@github-personal:username/repo.git

7. Git identity per repo(optional)

  • global

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    [user]
      name = Jak Lee
      email = personal@gmail.com

  • Personal

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    cd project
    git config user.name "Jak Lee"
    git config user.email "personal@gmail.com"

  • work

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    cd project2
    git config user.name "Jak Lee"
    git config user.email "work@company.com"

    Note:
    These settings are stored in project1/.git/config and project2/.git/config
    They override global ~/.gitconfig for that repo

  • check: git config --get user.email

A better way might be seperate folder for work and personal.

Create Seperate Directory for github

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~/Code/
├── personal/    # 個人專案
└── work/        # 工作專案

1. configure git global config

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[user]
    name = Your Default Name
    email = default@example.com

# 個人專案
[includeIf "gitdir/i:~/Code/personal/"]
    path = ~/Code/personal/.gitconfig

# 工作專案  
[includeIf "gitdir/i:~/Code/work/"]
    path = ~/Code/work/.gitconfig

2. Personal ~Code/personal/.gitconfig

~Code/personal/.gitconfig

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[user]
  name = CC
  email = personal@gmail.com

3. work ~Code/work/.gitconfig

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[user]
  name = CC
  email = work@company.com

4. Check and verify

  • check config

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    git config --show-origin --get user.email
    git config --show-origin --get user.name

  • other git command

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    # 修正 remote URL 為 SSH
    git remote set-url origin git@<你剛才設定的 SSH Host 名稱>:<Github 用戶名稱>/<Repo 名稱>.git

    # 確認配置自動套用
    git config user.name
    git config user.email

    # 檢查目前專案設定
    git config --local --list

    # 確認 remote URL  
    git remote -v

    # 測試 SSH 連線
    ssh -T github.com-personal
    ssh -T github.com-work

reference