Power off NixOS after being idle for some timeout

Help
1

I have a server running on AWS that I’d like to automatically shut down after it has been idle for some time. For me idle = no active SSH sessions. Following power management - Automatic shutdown after no activity - Unix & Linux Stack Exchange, I tried adding

  services.logind.extraConfig = ''
    IdleAction=poweroff
    IdleActionSec=5min
  '';

to my /etc/nixos/configuration.nix, rebooted, and logged out all SSH sessions. But this does not seem to have any effect.

Is there any way to get NixOS to power off after some configured idle timeout?

2

Scratched my own itch here and created https://github.com/samuela/nixos-idle-shutdown.

3

How about something like this?

{
  systemd.services.shutdown = {
    description = "automatic shutdown for inactivity";
    path    = with pkgs; [ procps gawk ];
    script  = ''
      # shutdown when no one is logged in
      logged=$(who | wc -l)
      if test "$logged" -lt 1 && ! pgrep -f '(sftp|tmux|something-interactive)'
      then shutdown +5 'Shutting down for inactivity.'
      fi
    '';
  };
  systemd.timers.shutdown = {
    wantedBy = [ "timers.target" ];
    timerConfig.OnUnitActiveSec = "1h";
    timerConfig.OnBootSec = "1h";
  };

}
4

Yeah, that also seems like a decent solution!