278 lines
8.5 KiB
Nix
278 lines
8.5 KiB
Nix
{ config, pkgs, lib, options, ... }:
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let
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inherit (lib) concatStrings foldl foldl' genAttrs literalExample maintainers
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mapAttrsToList mkDefault mkEnableOption mkIf mkMerge mkOption
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optional types mkOptionDefault flip attrNames;
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cfg = config.services.prometheus.exporters;
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# each attribute in `exporterOpts` is expected to have specified:
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# - port (types.int): port on which the exporter listens
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# - serviceOpts (types.attrs): config that is merged with the
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# default definition of the exporter's
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# systemd service
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# - extraOpts (types.attrs): extra configuration options to
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# configure the exporter with, which
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# are appended to the default options
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#
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# Note that `extraOpts` is optional, but a script for the exporter's
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# systemd service must be provided by specifying either
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# `serviceOpts.script` or `serviceOpts.serviceConfig.ExecStart`
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exporterOpts = genAttrs [
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"apcupsd"
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"artifactory"
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"bind"
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"bird"
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"bitcoin"
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"blackbox"
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"buildkite-agent"
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"collectd"
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"dnsmasq"
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"domain"
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"dovecot"
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"fastly"
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"fritzbox"
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"influxdb"
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"json"
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"jitsi"
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"kea"
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"keylight"
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"knot"
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"lnd"
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"mail"
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"mikrotik"
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"minio"
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"modemmanager"
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"nextcloud"
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"nginx"
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"nginxlog"
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"node"
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"openldap"
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"openvpn"
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"pihole"
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"postfix"
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"postgres"
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"process"
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"py-air-control"
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"redis"
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"rspamd"
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"rtl_433"
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"script"
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"snmp"
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"smokeping"
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"sql"
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"surfboard"
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"systemd"
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"tor"
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"unbound"
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"unifi"
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"unifi-poller"
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"varnish"
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"wireguard"
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"flow"
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] (name:
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import (./. + "/exporters/${name}.nix") { inherit config lib pkgs options; }
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);
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mkExporterOpts = ({ name, port }: {
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enable = mkEnableOption "the prometheus ${name} exporter";
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port = mkOption {
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type = types.port;
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default = port;
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description = ''
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Port to listen on.
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'';
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};
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listenAddress = mkOption {
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type = types.str;
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default = "0.0.0.0";
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description = ''
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Address to listen on.
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'';
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};
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extraFlags = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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Extra commandline options to pass to the ${name} exporter.
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'';
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};
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openFirewall = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Open port in firewall for incoming connections.
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'';
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};
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firewallFilter = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = literalExample ''
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"-i eth0 -p tcp -m tcp --dport ${toString port}"
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'';
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description = ''
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Specify a filter for iptables to use when
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<option>services.prometheus.exporters.${name}.openFirewall</option>
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is true. It is used as `ip46tables -I nixos-fw <option>firewallFilter</option> -j nixos-fw-accept`.
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'';
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};
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user = mkOption {
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type = types.str;
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default = "${name}-exporter";
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description = ''
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User name under which the ${name} exporter shall be run.
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'';
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};
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group = mkOption {
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type = types.str;
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default = "${name}-exporter";
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description = ''
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Group under which the ${name} exporter shall be run.
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'';
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};
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});
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mkSubModule = { name, port, extraOpts, imports }: {
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${name} = mkOption {
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type = types.submodule [{
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inherit imports;
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options = (mkExporterOpts {
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inherit name port;
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} // extraOpts);
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} ({ config, ... }: mkIf config.openFirewall {
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firewallFilter = mkDefault "-p tcp -m tcp --dport ${toString config.port}";
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})];
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internal = true;
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default = {};
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};
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};
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mkSubModules = (foldl' (a: b: a//b) {}
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(mapAttrsToList (name: opts: mkSubModule {
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inherit name;
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inherit (opts) port;
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extraOpts = opts.extraOpts or {};
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imports = opts.imports or [];
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}) exporterOpts)
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);
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mkExporterConf = { name, conf, serviceOpts }:
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let
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enableDynamicUser = serviceOpts.serviceConfig.DynamicUser or true;
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in
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mkIf conf.enable {
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warnings = conf.warnings or [];
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users.users."${name}-exporter" = (mkIf (conf.user == "${name}-exporter" && !enableDynamicUser) {
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description = "Prometheus ${name} exporter service user";
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isSystemUser = true;
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inherit (conf) group;
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});
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users.groups = (mkIf (conf.group == "${name}-exporter" && !enableDynamicUser) {
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"${name}-exporter" = {};
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});
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networking.firewall.extraCommands = mkIf conf.openFirewall (concatStrings [
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"ip46tables -A nixos-fw ${conf.firewallFilter} "
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"-m comment --comment ${name}-exporter -j nixos-fw-accept"
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]);
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systemd.services."prometheus-${name}-exporter" = mkMerge ([{
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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serviceConfig.Restart = mkDefault "always";
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serviceConfig.PrivateTmp = mkDefault true;
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serviceConfig.WorkingDirectory = mkDefault /tmp;
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serviceConfig.DynamicUser = mkDefault enableDynamicUser;
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serviceConfig.User = mkDefault conf.user;
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serviceConfig.Group = conf.group;
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} serviceOpts ]);
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};
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in
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{
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imports = (lib.forEach [ "blackboxExporter" "collectdExporter" "fritzboxExporter"
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"jsonExporter" "minioExporter" "nginxExporter" "nodeExporter"
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"snmpExporter" "unifiExporter" "varnishExporter" ]
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(opt: lib.mkRemovedOptionModule [ "services" "prometheus" "${opt}" ] ''
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The prometheus exporters are now configured using `services.prometheus.exporters'.
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See the 18.03 release notes for more information.
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'' ));
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options.services.prometheus.exporters = mkOption {
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type = types.submodule {
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options = (mkSubModules);
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};
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description = "Prometheus exporter configuration";
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default = {};
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example = literalExample ''
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{
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node = {
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enable = true;
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enabledCollectors = [ "systemd" ];
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};
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varnish.enable = true;
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}
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'';
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};
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config = mkMerge ([{
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assertions = [ {
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assertion = cfg.snmp.enable -> (
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(cfg.snmp.configurationPath == null) != (cfg.snmp.configuration == null)
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);
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message = ''
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Please ensure you have either `services.prometheus.exporters.snmp.configuration'
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or `services.prometheus.exporters.snmp.configurationPath' set!
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'';
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} {
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assertion = cfg.mikrotik.enable -> (
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(cfg.mikrotik.configFile == null) != (cfg.mikrotik.configuration == null)
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);
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message = ''
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Please specify either `services.prometheus.exporters.mikrotik.configuration'
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or `services.prometheus.exporters.mikrotik.configFile'.
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'';
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} {
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assertion = cfg.mail.enable -> (
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(cfg.mail.configFile == null) != (cfg.mail.configuration == null)
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);
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message = ''
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Please specify either 'services.prometheus.exporters.mail.configuration'
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or 'services.prometheus.exporters.mail.configFile'.
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'';
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} {
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assertion = cfg.sql.enable -> (
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(cfg.sql.configFile == null) != (cfg.sql.configuration == null)
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);
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message = ''
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Please specify either 'services.prometheus.exporters.sql.configuration' or
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'services.prometheus.exporters.sql.configFile'
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'';
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} ] ++ (flip map (attrNames cfg) (exporter: {
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assertion = cfg.${exporter}.firewallFilter != null -> cfg.${exporter}.openFirewall;
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message = ''
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The `firewallFilter'-option of exporter ${exporter} doesn't have any effect unless
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`openFirewall' is set to `true'!
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'';
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}));
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}] ++ [(mkIf config.services.minio.enable {
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services.prometheus.exporters.minio.minioAddress = mkDefault "http://localhost:9000";
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services.prometheus.exporters.minio.minioAccessKey = mkDefault config.services.minio.accessKey;
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services.prometheus.exporters.minio.minioAccessSecret = mkDefault config.services.minio.secretKey;
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})] ++ [(mkIf config.services.prometheus.exporters.rtl_433.enable {
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hardware.rtl-sdr.enable = mkDefault true;
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})] ++ [(mkIf config.services.postfix.enable {
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services.prometheus.exporters.postfix.group = mkDefault config.services.postfix.setgidGroup;
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})] ++ (mapAttrsToList (name: conf:
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mkExporterConf {
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inherit name;
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inherit (conf) serviceOpts;
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conf = cfg.${name};
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}) exporterOpts)
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);
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meta = {
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doc = ./exporters.xml;
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maintainers = [ maintainers.willibutz ];
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};
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}
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