91 lines
2.8 KiB
Nix
91 lines
2.8 KiB
Nix
{ config, lib, pkgs, ... }: with lib;
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let
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cfg = config.services.promtail;
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prettyJSON = conf: pkgs.runCommandLocal "promtail-config.json" {} ''
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echo '${builtins.toJSON conf}' | ${pkgs.buildPackages.jq}/bin/jq 'del(._module)' > $out
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'';
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allowSystemdJournal = cfg.configuration ? scrape_configs && lib.any (v: v ? journal) cfg.configuration.scrape_configs;
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allowPositionsFile = !lib.hasPrefix "/var/cache/promtail" positionsFile;
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positionsFile = cfg.configuration.positions.filename;
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in {
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options.services.promtail = with types; {
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enable = mkEnableOption (lib.mdDoc "the Promtail ingresser");
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configuration = mkOption {
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type = (pkgs.formats.json {}).type;
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description = lib.mdDoc ''
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Specify the configuration for Promtail in Nix.
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'';
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};
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extraFlags = mkOption {
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type = listOf str;
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default = [];
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example = [ "--server.http-listen-port=3101" ];
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description = lib.mdDoc ''
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Specify a list of additional command line flags,
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which get escaped and are then passed to Loki.
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'';
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};
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};
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config = mkIf cfg.enable {
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services.promtail.configuration.positions.filename = mkDefault "/var/cache/promtail/positions.yaml";
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systemd.services.promtail = {
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description = "Promtail log ingress";
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wantedBy = [ "multi-user.target" ];
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stopIfChanged = false;
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serviceConfig = {
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Restart = "on-failure";
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TimeoutStopSec = 10;
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ExecStart = "${pkgs.promtail}/bin/promtail -config.file=${prettyJSON cfg.configuration} ${escapeShellArgs cfg.extraFlags}";
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ProtectSystem = "strict";
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ProtectHome = true;
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PrivateTmp = true;
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PrivateDevices = true;
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ProtectKernelTunables = true;
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ProtectControlGroups = true;
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RestrictSUIDSGID = true;
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PrivateMounts = true;
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CacheDirectory = "promtail";
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ReadWritePaths = lib.optional allowPositionsFile (builtins.dirOf positionsFile);
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User = "promtail";
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Group = "promtail";
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CapabilityBoundingSet = "";
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NoNewPrivileges = true;
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ProtectKernelModules = true;
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SystemCallArchitectures = "native";
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ProtectKernelLogs = true;
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ProtectClock = true;
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LockPersonality = true;
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ProtectHostname = true;
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RestrictRealtime = true;
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MemoryDenyWriteExecute = true;
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PrivateUsers = true;
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SupplementaryGroups = lib.optional (allowSystemdJournal) "systemd-journal";
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} // (optionalAttrs (!pkgs.stdenv.isAarch64) { # FIXME: figure out why this breaks on aarch64
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SystemCallFilter = "@system-service";
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});
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};
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users.groups.promtail = {};
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users.users.promtail = {
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description = "Promtail service user";
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isSystemUser = true;
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group = "promtail";
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};
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};
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}
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