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apcupsd is a daemon for controlling APC UPSes. It is very simple to configure. If you have an USB based UPS, the default settings should be useable without further adjustments: services.apcupsd.enable = true; This will give you autodetection of USB UPSes, network access limited to localhost (for security) and the shutdown sequence will be started when the system when the battery level is below 50 percent, or when the UPS has calculated that it has 5 minutes or less of remaining power-on time. You can provide your own configuration file contents with this option: services.apcupsd.configText = "contents of apcupsd.conf"; Bug/annoyance 1: When apcupsd calls "wall" (on powerfail etc. events), it prints an error message because stdout is not connected to a tty (it is connected to the journal): wall: cannot get tty name: Inappropriate ioctl for device The message still gets through though, to ctrl-alt-f[1-6] terminals. Bug/annoyance 2: apcupsd tries to call "mail" (on powerfail etc. events), and that fails because I'm not passing in any mail program at the moment (because that would require more configuration options). A solution to this would be to simply let the user fully configure the apcupsd event handling logic in nix. |
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*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.