100 lines
3 KiB
Nix
100 lines
3 KiB
Nix
{
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config,
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lib,
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pkgs,
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...
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}:
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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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{
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###### interface
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options = {
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services.telegraf = {
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enable = lib.mkEnableOption "telegraf server";
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package = lib.mkPackageOption pkgs "telegraf" { };
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environmentFiles = lib.mkOption {
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type = lib.types.listOf lib.types.path;
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default = [ ];
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example = [ "/run/keys/telegraf.env" ];
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description = ''
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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 = lib.mkOption {
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default = { };
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description = "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 = lib.mkIf config.services.telegraf.enable {
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services.telegraf.extraConfig = {
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inputs = { };
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outputs = { };
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};
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systemd.services.telegraf =
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let
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finalConfigFile =
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if config.services.telegraf.environmentFiles == [ ] then
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configFile
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else
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"/var/run/telegraf/config.toml";
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in
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{
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description = "Telegraf Agent";
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wantedBy = [ "multi-user.target" ];
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wants = [ "network-online.target" ];
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after = [ "network-online.target" ];
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path =
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lib.optional (config.services.telegraf.extraConfig.inputs ? procstat) pkgs.procps
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++ lib.optional (config.services.telegraf.extraConfig.inputs ? ping) pkgs.iputils;
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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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);
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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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