Security Tool

SSH Config Generator

Generate SSH config files for multiple GitHub, GitLab, and other host identities.

How it works

This tool generates an SSH config file that should be placed at ~/.ssh/config. Each Host entry defines how SSH should connect to a specific host, including which identity file (private key) to use. This allows you to use different SSH keys for different Git hosting services or accounts.

SSH Host Configurations

Host 1

Host (Alias) *

HostName *

User *

Port (Optional)

IdentityFile (Private Key Path) *

Path to your private SSH key file

IdentitiesOnly yes

Only use the specified IdentityFile, ignore other keys

AddKeysToAgent

UseKeychain (macOS)

Compression

ForwardAgent

Custom Options (Optional)

Additional SSH options (one per line, without indentation)

Generated SSH Config

# Identity for GitHub account
Host github.com
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_rsa_github
  IdentitiesOnly yes

Installation instructions:

Save this config to ~/.ssh/config
Set correct permissions: chmod 600 ~/.ssh/config
Ensure your SSH keys exist at the specified IdentityFile paths
Test connection: ssh -T git@github.com

Common Use Cases

Multiple GitHub Accounts:

Create separate Host entries: github.com and github-work.com
Use different IdentityFile paths for each account
For the work account, set HostName to github.com but Host to a custom alias

GitHub + GitLab:

Use presets to quickly add GitHub and GitLab configurations
Ensure each has a unique IdentityFile pointing to different SSH keys
Enable IdentitiesOnly to prevent using the wrong key

macOS Keychain Integration:

Enable UseKeychain to store passphrases in macOS Keychain
Use with AddKeysToAgent for seamless key management
Run: ssh-add --apple-use-keychain ~/.ssh/id_rsa to add keys

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