SSH Config for GitHub

Setting Up SSH for GitHub

Configuring SSH for GitHub eliminates the need to enter credentials for every git push or git pull. By adding a dedicated Host entry in your ~/.ssh/config, you tell the SSH client exactly which key to use when connecting to GitHub.

Example Config

Host github.com
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_ed25519_github
  IdentitiesOnly yes
  AddKeysToAgent yes

Key Directives Explained

Directive	Purpose
Host github.com	Matches connections to github.com
User git	GitHub always uses the git user for SSH
IdentityFile	Points to your GitHub-specific private key
IdentitiesOnly yes	Prevents SSH from trying other keys in the agent
AddKeysToAgent yes	Caches the key in ssh-agent after first use

Why Use a Dedicated Key?

Using a separate SSH key for GitHub (rather than your default key) provides better security isolation. If one key is compromised, your other services remain unaffected. It also avoids confusion when you have keys for multiple services loaded in your SSH agent.

Generating the Key

If you don't already have a key, create one with:

ssh-keygen -t ed25519 -C "your-email@example.com" -f ~/.ssh/id_ed25519_github

Then add the public key (~/.ssh/id_ed25519_github.pub) to your GitHub account under Settings > SSH and GPG keys.