Secure shell (SSH) access to your machine can be enabled by setting: services.openssh.enable = true; By default, root logins using a password are disallowed. They can be disabled entirely by setting services.openssh.permitRootLogin to "no". You can declaratively specify authorised RSA/DSA public keys for a user as follows: users.users.alice.openssh.authorizedKeys.keys = [ "ssh-dss AAAAB3NzaC1kc3MAAACBAPIkGWVEt4..." ];