29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
88 lines
2.5 KiB
Nix
88 lines
2.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.dd-agent;
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datadog_conf = pkgs.runCommand "datadog.conf" {} ''
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sed -e 's|^api_key:|api_key: ${cfg.api_key}|' ${optionalString (cfg.hostname != null)
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"-e 's|^#hostname: mymachine.mydomain|hostname: ${cfg.hostname}|'"
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} ${pkgs.dd-agent}/etc/dd-agent/datadog.conf.example > $out
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'';
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in {
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options.services.dd-agent = {
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enable = mkOption {
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description = "Whether to enable the dd-agent montioring service";
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default = false;
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type = types.bool;
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};
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# !!! This gets stored in the store (world-readable), wish we had https://github.com/NixOS/nix/issues/8
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api_key = mkOption {
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description = "The Datadog API key to associate the agent with your account";
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example = "ae0aa6a8f08efa988ba0a17578f009ab";
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type = types.str;
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};
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hostname = mkOption {
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description = "The hostname to show in the Datadog dashboard (optional)";
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default = null;
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example = "mymachine.mydomain";
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type = types.uniq (types.nullOr types.string);
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};
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};
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config = mkIf cfg.enable {
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environment.etc = [ { source = datadog_conf; target = "dd-agent/datadog.conf"; } ];
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environment.systemPackages = [ pkgs."dd-agent" pkgs.sysstat pkgs.procps ];
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users.extraUsers."dd-agent" = {
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description = "Datadog Agent User";
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uid = config.ids.uids.dd-agent;
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group = "dd-agent";
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home = "/var/log/datadog/";
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createHome = true;
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};
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users.extraGroups.dd-agent.gid = config.ids.gids.dd-agent;
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systemd.services.dd-agent = {
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description = "Datadog agent monitor";
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path = [ pkgs."dd-agent" pkgs.python pkgs.sysstat pkgs.procps];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = "${pkgs.dd-agent}/bin/dd-agent foreground";
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User = "dd-agent";
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Group = "dd-agent";
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Restart = "always";
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RestartSec = 2;
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};
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restartTriggers = [ pkgs.dd-agent datadog_conf ];
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};
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systemd.services.dogstatsd = {
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description = "Datadog statsd";
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path = [ pkgs."dd-agent" pkgs.python ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = "${pkgs.dd-agent}/bin/dogstatsd start";
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User = "dd-agent";
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Group = "dd-agent";
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Type = "forking";
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PIDFile = "/tmp/dogstatsd.pid";
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Restart = "always";
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RestartSec = 2;
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};
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restartTriggers = [ pkgs.dd-agent datadog_conf ];
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};
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};
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}
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