90 lines
2.7 KiB
Nix
90 lines
2.7 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.telegraf;
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settingsFormat = pkgs.formats.toml {};
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configFile = settingsFormat.generate "config.toml" cfg.extraConfig;
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in {
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###### interface
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options = {
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services.telegraf = {
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enable = mkEnableOption "telegraf server";
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package = mkOption {
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default = pkgs.telegraf;
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defaultText = literalExpression "pkgs.telegraf";
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description = lib.mdDoc "Which telegraf derivation to use";
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type = types.package;
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};
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environmentFiles = mkOption {
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type = types.listOf types.path;
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default = [];
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example = [ "/run/keys/telegraf.env" ];
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description = lib.mdDoc ''
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File to load as environment file. Environment variables from this file
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will be interpolated into the config file using envsubst with this
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syntax: `$ENVIRONMENT` or `''${VARIABLE}`.
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This is useful to avoid putting secrets into the nix store.
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'';
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};
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extraConfig = mkOption {
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default = {};
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description = lib.mdDoc "Extra configuration options for telegraf";
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type = settingsFormat.type;
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example = {
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outputs.influxdb = {
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urls = ["http://localhost:8086"];
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database = "telegraf";
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};
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inputs.statsd = {
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service_address = ":8125";
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delete_timings = true;
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};
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};
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};
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};
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};
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###### implementation
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config = mkIf config.services.telegraf.enable {
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systemd.services.telegraf = let
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finalConfigFile = if config.services.telegraf.environmentFiles == []
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then configFile
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else "/var/run/telegraf/config.toml";
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in {
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description = "Telegraf Agent";
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wantedBy = [ "multi-user.target" ];
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after = [ "network-online.target" ];
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serviceConfig = {
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EnvironmentFile = config.services.telegraf.environmentFiles;
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ExecStartPre = lib.optional (config.services.telegraf.environmentFiles != [])
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(pkgs.writeShellScript "pre-start" ''
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umask 077
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${pkgs.envsubst}/bin/envsubst -i "${configFile}" > /var/run/telegraf/config.toml
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'');
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ExecStart="${cfg.package}/bin/telegraf -config ${finalConfigFile}";
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ExecReload="${pkgs.coreutils}/bin/kill -HUP $MAINPID";
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RuntimeDirectory = "telegraf";
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User = "telegraf";
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Group = "telegraf";
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Restart = "on-failure";
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# for ping probes
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AmbientCapabilities = [ "CAP_NET_RAW" ];
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};
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};
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users.users.telegraf = {
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uid = config.ids.uids.telegraf;
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group = "telegraf";
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description = "telegraf daemon user";
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};
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users.groups.telegraf = {};
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};
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}
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