de5a69c918
On reboots and shutdowns promtail blocks for at least 90 seconds, because it would still try to deliver log messages for loki, which isn't possible when the network has already gone down. Upstreams example unit also uses a ten seconds timeout, something which has worked pretty well for me as well.
88 lines
2.5 KiB
Nix
88 lines
2.5 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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in {
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options.services.promtail = with types; {
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enable = mkEnableOption "the Promtail ingresser";
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configuration = mkOption {
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type = (pkgs.formats.json {}).type;
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description = ''
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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 = ''
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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.grafana-loki}/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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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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