ZapSSH — Free SSH Config Generator

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Host Entries

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Global Options (Host *)

Include in config

ServerAliveInterval

ServerAliveCountMax

AddKeysToAgent

IdentitiesOnly

ControlMaster / ControlPath (connection multiplexing)

ControlPersist

Generated ~/.ssh/config

Validation

Best Practice Tips

SSH Config Essentials:

Use ~/.ssh/config with permissions 600 (chmod 600 ~/.ssh/config)
Prefer ed25519 keys over RSA — smaller, faster, and more secure
Use Host * for global defaults that apply to all connections
Wildcard hosts like Host *.example.com match multiple hosts at once
The first matching Host block wins — put specific hosts before wildcards
Use ProxyJump (or the older ProxyCommand) to reach hosts behind a bastion
Set AddKeysToAgent yes + UseKeychain yes (macOS) to avoid re-entering passphrases
Enable multiplexing (ControlMaster auto) to reuse connections and speed up repeated SSH/SCP/git operations