76 lines
2.7 KiB
Nix
76 lines
2.7 KiB
Nix
{ config, lib, options, pkgs, ... }:
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let
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cfg = config.services.hcloud_exporter;
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in
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{
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options.services.hcloud_exporter = {
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enable = lib.mkEnableOption "the prometheus hcloud exporter";
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package = lib.mkOption {
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type = lib.types.package;
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default = pkgs.hcloud_exporter;
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description = "The package to use for hcloud_exporter";
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};
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listenAddress = lib.mkOption {
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type = lib.types.str;
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default = "0.0.0.0:9501";
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example = "127.0.0.1:9501";
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description = "The address hcloud_exporter should listen on";
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};
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collectors = lib.mkOption {
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type = lib.types.listOf lib.types.str;
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default = [ "floating-ips" "images" "pricing" "servers" "ssh-keys" ];
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example = [ "servers" "volumes" ];
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description = "The collectors to enable";
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};
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environmentFile = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = "/path/to/hcloud_exporter.env";
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description = ''
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A file including environment variables being passed to hcloud_exporter
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to allow storing the token outside of the nix store.
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It should be formatted according to the specification of systemd.exec(5)’s EnvironmentFile.
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'';
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};
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};
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config = {
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systemd.services.hcloud_exporter = lib.mkIf cfg.enable {
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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environment = {
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HCLOUD_EXPORTER_WEB_ADDRESS = cfg.listenAddress;
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} // (
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let
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defaultCollectors = options.services.hcloud_exporter.collectors.default;
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enabledCollectors = cfg.collectors;
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disabledCollectors = lib.subtractLists enabledCollectors defaultCollectors;
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collectorAttrs = lib.listToAttrs
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(map (lib.flip lib.nameValuePair "true") enabledCollectors
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++ map (lib.flip lib.nameValuePair "false") disabledCollectors);
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toUpperSnakeCase = x: lib.toUpper (lib.replaceStrings [ "-" ] [ "_" ] x);
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collectorStateToEnv = collector: state: lib.nameValuePair "HCLOUD_EXPORTER_COLLECTOR_${toUpperSnakeCase collector}" state;
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in
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lib.mapAttrs' collectorStateToEnv collectorAttrs
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);
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serviceConfig = {
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ExecStart = "${cfg.package}/bin/hcloud_exporter";
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Restart = "always";
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EnvironmentFile = cfg.environmentFile;
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# systemd-analyze --no-pager security hcloud_exporter.service
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CapabilityBoundingSet = null;
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DynamicUser = true;
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PrivateDevices = true;
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PrivateUsers = true;
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ProtectHome = true;
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RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
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RestrictNamespaces = true;
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SystemCallArchitectures = "native";
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SystemCallFilter = "@system-service";
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};
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};
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};
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}
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