370 lines
13 KiB
Nix
370 lines
13 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.services.netdata;
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wrappedPlugins = pkgs.runCommand "wrapped-plugins" { preferLocalBuild = true; } ''
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mkdir -p $out/libexec/netdata/plugins.d
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ln -s /run/wrappers/bin/apps.plugin $out/libexec/netdata/plugins.d/apps.plugin
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ln -s /run/wrappers/bin/cgroup-network $out/libexec/netdata/plugins.d/cgroup-network
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ln -s /run/wrappers/bin/perf.plugin $out/libexec/netdata/plugins.d/perf.plugin
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ln -s /run/wrappers/bin/slabinfo.plugin $out/libexec/netdata/plugins.d/slabinfo.plugin
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ln -s /run/wrappers/bin/freeipmi.plugin $out/libexec/netdata/plugins.d/freeipmi.plugin
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ln -s /run/wrappers/bin/systemd-journal.plugin $out/libexec/netdata/plugins.d/systemd-journal.plugin
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'';
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plugins = [
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"${cfg.package}/libexec/netdata/plugins.d"
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"${wrappedPlugins}/libexec/netdata/plugins.d"
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] ++ cfg.extraPluginPaths;
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configDirectory = pkgs.runCommand "netdata-config-d" { } ''
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mkdir $out
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${concatStringsSep "\n" (mapAttrsToList (path: file: ''
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mkdir -p "$out/$(dirname ${path})"
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ln -s "${file}" "$out/${path}"
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'') cfg.configDir)}
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'';
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localConfig = {
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global = {
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"config directory" = "/etc/netdata/conf.d";
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"plugins directory" = concatStringsSep " " plugins;
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};
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web = {
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"web files owner" = "root";
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"web files group" = "root";
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};
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"plugin:cgroups" = {
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"script to get cgroup network interfaces" = "${wrappedPlugins}/libexec/netdata/plugins.d/cgroup-network";
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"use unified cgroups" = "yes";
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};
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};
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mkConfig = generators.toINI {} (recursiveUpdate localConfig cfg.config);
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configFile = pkgs.writeText "netdata.conf" (if cfg.configText != null then cfg.configText else mkConfig);
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defaultUser = "netdata";
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in {
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options = {
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services.netdata = {
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enable = mkEnableOption (lib.mdDoc "netdata");
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package = mkPackageOption pkgs "netdata" { };
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user = mkOption {
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type = types.str;
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default = "netdata";
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description = lib.mdDoc "User account under which netdata runs.";
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};
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group = mkOption {
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type = types.str;
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default = "netdata";
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description = lib.mdDoc "Group under which netdata runs.";
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};
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configText = mkOption {
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type = types.nullOr types.lines;
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description = lib.mdDoc "Verbatim netdata.conf, cannot be combined with config.";
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default = null;
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example = ''
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[global]
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debug log = syslog
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access log = syslog
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error log = syslog
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'';
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};
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python = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether to enable python-based plugins
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'';
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};
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extraPackages = mkOption {
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type = types.functionTo (types.listOf types.package);
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default = ps: [];
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defaultText = literalExpression "ps: []";
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example = literalExpression ''
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ps: [
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ps.psycopg2
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ps.docker
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ps.dnspython
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]
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'';
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description = lib.mdDoc ''
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Extra python packages available at runtime
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to enable additional python plugins.
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'';
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};
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};
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extraPluginPaths = mkOption {
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type = types.listOf types.path;
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default = [ ];
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example = literalExpression ''
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[ "/path/to/plugins.d" ]
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'';
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description = lib.mdDoc ''
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Extra paths to add to the netdata global "plugins directory"
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option. Useful for when you want to include your own
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collection scripts.
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Details about writing a custom netdata plugin are available at:
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<https://docs.netdata.cloud/collectors/plugins.d/>
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Cannot be combined with configText.
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'';
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};
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config = mkOption {
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type = types.attrsOf types.attrs;
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default = {};
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description = lib.mdDoc "netdata.conf configuration as nix attributes. cannot be combined with configText.";
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example = literalExpression ''
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global = {
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"debug log" = "syslog";
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"access log" = "syslog";
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"error log" = "syslog";
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};
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'';
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};
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configDir = mkOption {
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type = types.attrsOf types.path;
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default = {};
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description = lib.mdDoc ''
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Complete netdata config directory except netdata.conf.
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The default configuration is merged with changes
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defined in this option.
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Each top-level attribute denotes a path in the configuration
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directory as in environment.etc.
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Its value is the absolute path and must be readable by netdata.
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Cannot be combined with configText.
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'';
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example = literalExpression ''
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"health_alarm_notify.conf" = pkgs.writeText "health_alarm_notify.conf" '''
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sendmail="/path/to/sendmail"
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''';
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"health.d" = "/run/secrets/netdata/health.d";
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'';
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};
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claimTokenFile = mkOption {
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type = types.nullOr types.path;
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default = null;
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description = lib.mdDoc ''
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If set, automatically registers the agent using the given claim token
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file.
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'';
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};
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enableAnalyticsReporting = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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Enable reporting of anonymous usage statistics to Netdata Inc. via either
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Google Analytics (in versions prior to 1.29.4), or Netdata Inc.'s
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self-hosted PostHog (in versions 1.29.4 and later).
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See: <https://learn.netdata.cloud/docs/agent/anonymous-statistics>
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'';
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};
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deadlineBeforeStopSec = mkOption {
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type = types.int;
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default = 120;
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description = lib.mdDoc ''
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In order to detect when netdata is misbehaving, we run a concurrent task pinging netdata (wait-for-netdata-up)
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in the systemd unit.
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If after a while, this task does not succeed, we stop the unit and mark it as failed.
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You can control this deadline in seconds with this option, it's useful to bump it
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if you have (1) a lot of data (2) doing upgrades (3) have low IOPS/throughput.
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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assertions =
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[ { assertion = cfg.config != {} -> cfg.configText == null ;
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message = "Cannot specify both config and configText";
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}
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];
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services.netdata.configDir.".opt-out-from-anonymous-statistics" = mkIf (!cfg.enableAnalyticsReporting) (pkgs.writeText ".opt-out-from-anonymous-statistics" "");
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environment.etc."netdata/netdata.conf".source = configFile;
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environment.etc."netdata/conf.d".source = configDirectory;
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systemd.services.netdata = {
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description = "Real time performance monitoring";
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after = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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path = (with pkgs; [
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curl
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gawk
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iproute2
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which
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procps
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bash
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util-linux # provides logger command; required for syslog health alarms
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])
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++ lib.optional cfg.python.enable (pkgs.python3.withPackages cfg.python.extraPackages)
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++ lib.optional config.virtualisation.libvirtd.enable (config.virtualisation.libvirtd.package);
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environment = {
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PYTHONPATH = "${cfg.package}/libexec/netdata/python.d/python_modules";
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NETDATA_PIPENAME = "/run/netdata/ipc";
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} // lib.optionalAttrs (!cfg.enableAnalyticsReporting) {
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DO_NOT_TRACK = "1";
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};
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restartTriggers = [
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config.environment.etc."netdata/netdata.conf".source
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config.environment.etc."netdata/conf.d".source
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];
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serviceConfig = {
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ExecStart = "${cfg.package}/bin/netdata -P /run/netdata/netdata.pid -D -c /etc/netdata/netdata.conf";
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ExecReload = "${pkgs.util-linux}/bin/kill -s HUP -s USR1 -s USR2 $MAINPID";
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ExecStartPost = pkgs.writeShellScript "wait-for-netdata-up" ''
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while [ "$(${cfg.package}/bin/netdatacli ping)" != pong ]; do sleep 0.5; done
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'';
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TimeoutStopSec = cfg.deadlineBeforeStopSec;
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Restart = "on-failure";
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# User and group
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User = cfg.user;
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Group = cfg.group;
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# Performance
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LimitNOFILE = "30000";
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# Runtime directory and mode
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RuntimeDirectory = "netdata";
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RuntimeDirectoryMode = "0750";
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# State directory and mode
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StateDirectory = "netdata";
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StateDirectoryMode = "0750";
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# Cache directory and mode
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CacheDirectory = "netdata";
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CacheDirectoryMode = "0750";
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# Logs directory and mode
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LogsDirectory = "netdata";
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LogsDirectoryMode = "0750";
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# Configuration directory and mode
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ConfigurationDirectory = "netdata";
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ConfigurationDirectoryMode = "0755";
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# Capabilities
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CapabilityBoundingSet = [
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"CAP_DAC_OVERRIDE" # is required for freeipmi and slabinfo plugins
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"CAP_DAC_READ_SEARCH" # is required for apps and systemd-journal plugin
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"CAP_FOWNER" # is required for freeipmi plugin
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"CAP_SETPCAP" # is required for apps, perf and slabinfo plugins
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"CAP_SYS_ADMIN" # is required for perf plugin
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"CAP_SYS_PTRACE" # is required for apps plugin
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"CAP_SYS_RESOURCE" # is required for ebpf plugin
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"CAP_NET_RAW" # is required for fping app
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"CAP_SYS_CHROOT" # is required for cgroups plugin
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"CAP_SETUID" # is required for cgroups and cgroups-network plugins
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"CAP_SYSLOG" # is required for systemd-journal plugin
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];
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# Sandboxing
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ProtectSystem = "full";
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ProtectHome = "read-only";
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PrivateTmp = true;
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ProtectControlGroups = true;
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PrivateMounts = true;
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} // (lib.optionalAttrs (cfg.claimTokenFile != null) {
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LoadCredential = [
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"netdata_claim_token:${cfg.claimTokenFile}"
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];
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ExecStartPre = pkgs.writeShellScript "netdata-claim" ''
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set -euo pipefail
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if [[ -f /var/lib/netdata/cloud.d/claimed_id ]]; then
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# Already registered
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exit
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fi
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exec ${cfg.package}/bin/netdata-claim.sh \
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-token="$(< "$CREDENTIALS_DIRECTORY/netdata_claim_token")" \
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-url=https://app.netdata.cloud \
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-daemon-not-running
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'';
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});
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};
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systemd.enableCgroupAccounting = true;
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security.wrappers = {
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"apps.plugin" = {
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source = "${cfg.package}/libexec/netdata/plugins.d/apps.plugin.org";
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capabilities = "cap_dac_read_search,cap_sys_ptrace+ep";
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owner = cfg.user;
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group = cfg.group;
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permissions = "u+rx,g+x,o-rwx";
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};
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"cgroup-network" = {
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source = "${cfg.package}/libexec/netdata/plugins.d/cgroup-network.org";
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capabilities = "cap_setuid+ep";
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owner = cfg.user;
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group = cfg.group;
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permissions = "u+rx,g+x,o-rwx";
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};
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"perf.plugin" = {
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source = "${cfg.package}/libexec/netdata/plugins.d/perf.plugin.org";
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capabilities = "cap_sys_admin+ep";
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owner = cfg.user;
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group = cfg.group;
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permissions = "u+rx,g+x,o-rwx";
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};
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"systemd-journal.plugin" = {
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source = "${cfg.package}/libexec/netdata/plugins.d/systemd-journal.plugin.org";
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capabilities = "cap_dac_read_search,cap_syslog+ep";
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owner = cfg.user;
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group = cfg.group;
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permissions = "u+rx,g+x,o-rwx";
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};
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"slabinfo.plugin" = {
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source = "${cfg.package}/libexec/netdata/plugins.d/slabinfo.plugin.org";
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capabilities = "cap_dac_override+ep";
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owner = cfg.user;
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group = cfg.group;
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permissions = "u+rx,g+x,o-rwx";
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};
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} // optionalAttrs (cfg.package.withIpmi) {
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"freeipmi.plugin" = {
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source = "${cfg.package}/libexec/netdata/plugins.d/freeipmi.plugin.org";
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capabilities = "cap_dac_override,cap_fowner+ep";
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owner = cfg.user;
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group = cfg.group;
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permissions = "u+rx,g+x,o-rwx";
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};
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};
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security.pam.loginLimits = [
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{ domain = "netdata"; type = "soft"; item = "nofile"; value = "10000"; }
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{ domain = "netdata"; type = "hard"; item = "nofile"; value = "30000"; }
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];
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users.users = optionalAttrs (cfg.user == defaultUser) {
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${defaultUser} = {
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group = defaultUser;
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isSystemUser = true;
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};
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};
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users.groups = optionalAttrs (cfg.group == defaultUser) {
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${defaultUser} = { };
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};
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};
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}
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