Quickly enable ssh in nixos ( https://git.io/fhNKV )

quick-ssh.nix

{ ... }:

# Temporarily enable ssh
{
  services = {
    # Enable the OpenSSH daemon.
    openssh = {
      enable = true;

      # Use for initial login
      permitRootLogin = "yes"; # todo: mkForce

      # Larger MaxAuthTries helps to avoid ssh 'Too many authentication failures' issue
      # See https://github.com/NixOS/nixops/issues/593#issue-203407250
      extraConfig = ''
        MaxAuthTries 20
      '';
    };
  };
}