nixos/modules/services/log-to-ram/default.nix

{ config, lib, ... }:
let
  cfg = config.services.az-log2ram;
in
{
  options = {
    services.az-log2ram.enable = lib.mkEnableOption "Enable log to RAM";
  };

  config = lib.mkIf cfg.enable {
    fileSystems."/var/log" = {
      device = "none";
      fsType = "tmpfs";
      options = [
        "defaults"
        "size=300M"
      ];
    };
    services.journald.extraConfig = ''
      SystemMaxUse=300M
      Storage=volatile
    '';
  };
}