Setup Multiple GitHub SSH Keys

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🛠️ Setup Multiple GitHub SSH Keys on macOS (Different Email/Account)

✅ 1. Generate a New SSH Key

ssh-keygen -t ed25519 -C "new_email@example.com" -f ~/.ssh/id_ed25519_new

• Private key: ~/.ssh/id_ed25519_new

• Public key: ~/.ssh/id_ed25519_new.pub

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✅ 2. Add the New Key to the SSH Agent

eval "$(ssh-agent -s)"
ssh-add --apple-use-keychain ~/.ssh/id_ed25519_new

If the above fails:

ssh-add ~/.ssh/id_ed25519_new

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✅ 3. Add Public Key to GitHub

Copy the key:

pbcopy < ~/.ssh/id_ed25519_new.pub

Then go to your GitHub Account > Settings > SSH and GPG Keys
→ Click New SSH Key → Paste → Save

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✅ 4. Configure SSH for Multiple GitHub Accounts

Edit your SSH config:

nano ~/.ssh/config

Paste this configuration:

# Default GitHub account
Host github.com
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_ed25519
  IdentitiesOnly yes

# Second GitHub account (new email)
Host github-new
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_ed25519_new
  IdentitiesOnly yes

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✅ 5. Clone Repos from New Account

git clone git@github-new:username/repo.git

Or change remote on an existing repo:

git remote set-url origin git@github-new:username/repo.git

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🎯 Bonus: Set Local Git Email Per Project

git config user.name "Your New GitHub Name"
git config user.email "new_email@example.com"

To persist this only in the current repo:

git config --local user.name "Your New GitHub Name"
git config --local user.email "new_email@example.com"

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