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Add prometheus2 configuration to the prometheus modules
As the configuration for the exporters and alertmanager is unchanged between the two major versions this patch tries to minimize duplication while at the same time as there's no upgrade path from 1.x to 2.x, it allows running the two services in parallel. See also #56037
This commit is contained in:
Alberto Berti
Jean-Baptiste Giraudeau
parent
373488e6f4
commit
11b89720b7
20 changed files with 1110 additions and 859 deletions
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@ -4,8 +4,11 @@ with lib;
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let
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cfg = config.services.prometheus;
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cfg2 = config.services.prometheus2;
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promUser = "prometheus";
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promGroup = "prometheus";
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prom2User = "prometheus2";
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prom2Group = "prometheus2";
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# Get a submodule without any embedded metadata:
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_filter = x: filterAttrs (k: v: k != "_module") x;
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@ -17,13 +20,21 @@ let
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promtool ${what} $out
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'';
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# a wrapper that verifies that the configuration is valid for
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# prometheus 2
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prom2toolCheck = what: name: file: pkgs.runCommand "${name}-${what}-checked"
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{ buildInputs = [ cfg2.package ]; } ''
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ln -s ${file} $out
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promtool ${what} $out
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'';
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# Pretty-print JSON to a file
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writePrettyJSON = name: x:
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pkgs.runCommand name { preferLocalBuild = true; } ''
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echo '${builtins.toJSON x}' | ${pkgs.jq}/bin/jq . > $out
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'';
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# This becomes the main config file
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# This becomes the main config file for Prometheus 1
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promConfig = {
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global = cfg.globalConfig;
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rule_files = map (promtoolCheck "check-rules" "rules") (cfg.ruleFiles ++ [
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@ -35,7 +46,7 @@ let
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generatedPrometheusYml = writePrettyJSON "prometheus.yml" promConfig;
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prometheusYml = let
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yml = if cfg.configText != null then
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yml = if cfg.configText != null then
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pkgs.writeText "prometheus.yml" cfg.configText
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else generatedPrometheusYml;
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in promtoolCheck "check-config" "prometheus.yml" yml;
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@ -50,6 +61,39 @@ let
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(optionalString (cfg.webExternalUrl != null) "-web.external-url=${cfg.webExternalUrl}")
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];
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# This becomes the main config file for Prometheus 2
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promConfig2 = {
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global = cfg2.globalConfig;
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rule_files = map (prom2toolCheck "check-rules" "rules") (cfg2.ruleFiles ++ [
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(pkgs.writeText "prometheus.rules" (concatStringsSep "\n" cfg2.rules))
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]);
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scrape_configs = cfg2.scrapeConfigs;
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alerting = optionalAttrs (cfg2.alertmanagerURL != []) {
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alertmanagers = [{
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static_configs = [{
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targets = cfg2.alertmanagerURL;
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}];
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}];
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};
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};
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generatedPrometheus2Yml = writePrettyJSON "prometheus.yml" promConfig2;
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prometheus2Yml = let
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yml = if cfg2.configText != null then
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pkgs.writeText "prometheus.yml" cfg2.configText
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else generatedPrometheus2Yml;
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in promtoo2lCheck "check-config" "prometheus.yml" yml;
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cmdlineArgs2 = cfg2.extraFlags ++ [
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"--storage.tsdb.path=${cfg2.dataDir}/data/"
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"--config.file=${prometheus2Yml}"
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"--web.listen-address=${cfg2.listenAddress}"
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"--alertmanager.notification-queue-capacity=${toString cfg2.alertmanagerNotificationQueueCapacity}"
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"--alertmanager.timeout=${toString cfg2.alertmanagerTimeout}s"
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(optionalString (cfg2.webExternalUrl != null) "-web.external-url=${cfg2.webExternalUrl}")
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];
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promTypes.globalConfig = types.submodule {
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options = {
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scrape_interval = mkOption {
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@ -497,30 +541,178 @@ in {
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'';
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};
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};
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};
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services.prometheus2 = {
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config = mkIf cfg.enable {
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users.groups.${promGroup}.gid = config.ids.gids.prometheus;
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users.users.${promUser} = {
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description = "Prometheus daemon user";
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uid = config.ids.uids.prometheus;
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group = promGroup;
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home = cfg.dataDir;
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createHome = true;
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};
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systemd.services.prometheus = {
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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script = ''
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#!/bin/sh
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exec ${cfg.package}/bin/prometheus \
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${concatStringsSep " \\\n " cmdlineArgs}
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'';
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serviceConfig = {
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User = promUser;
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Restart = "always";
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WorkingDirectory = cfg.dataDir;
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Enable the Prometheus 2 monitoring daemon.
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'';
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};
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package = mkOption {
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type = types.package;
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default = pkgs.prometheus_2;
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defaultText = "pkgs.prometheus_2";
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description = ''
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The prometheus2 package that should be used.
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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 = "0.0.0.0:9090";
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description = ''
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Address to listen on for the web interface, API, and telemetry.
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'';
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};
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dataDir = mkOption {
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type = types.path;
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default = "/var/lib/prometheus2";
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description = ''
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Directory to store Prometheus 2 metrics data.
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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 when launching Prometheus 2.
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'';
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};
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configText = mkOption {
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type = types.nullOr types.lines;
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default = null;
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description = ''
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If non-null, this option defines the text that is written to
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prometheus.yml. If null, the contents of prometheus.yml is generated
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from the structured config options.
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'';
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};
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globalConfig = mkOption {
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type = promTypes.globalConfig;
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default = {};
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apply = _filter;
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description = ''
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Parameters that are valid in all configuration contexts. They
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also serve as defaults for other configuration sections
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'';
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};
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rules = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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Alerting and/or Recording rules to evaluate at runtime.
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'';
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};
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ruleFiles = mkOption {
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type = types.listOf types.path;
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default = [];
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description = ''
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Any additional rules files to include in this configuration.
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'';
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};
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scrapeConfigs = mkOption {
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type = types.listOf promTypes.scrape_config;
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default = [];
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apply = x: map _filter x;
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description = ''
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A list of scrape configurations.
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'';
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};
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alertmanagerURL = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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List of Alertmanager URLs to send notifications to.
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'';
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};
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alertmanagerNotificationQueueCapacity = mkOption {
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type = types.int;
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default = 10000;
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description = ''
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The capacity of the queue for pending alert manager notifications.
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'';
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};
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alertmanagerTimeout = mkOption {
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type = types.int;
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default = 10;
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description = ''
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Alert manager HTTP API timeout (in seconds).
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'';
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};
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webExternalUrl = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "https://example.com/";
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description = ''
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The URL under which Prometheus is externally reachable (for example,
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if Prometheus is served via a reverse proxy).
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'';
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};
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};
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};
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};
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config = mkMerge [
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(mkIf cfg.enable {
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users.groups.${promGroup}.gid = config.ids.gids.prometheus;
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users.users.${promUser} = {
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description = "Prometheus daemon user";
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uid = config.ids.uids.prometheus;
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group = promGroup;
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home = cfg.dataDir;
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createHome = true;
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};
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systemd.services.prometheus = {
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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script = ''
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#!/bin/sh
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exec ${cfg.package}/bin/prometheus \
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${concatStringsSep " \\\n " cmdlineArgs}
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'';
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serviceConfig = {
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User = promUser;
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Restart = "always";
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WorkingDirectory = cfg.dataDir;
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};
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};
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})
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(mkIf cfg2.enable {
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users.groups.${prom2Group}.gid = config.ids.gids.prometheus2;
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users.users.${prom2User} = {
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description = "Prometheus2 daemon user";
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uid = config.ids.uids.prometheus2;
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group = prom2Group;
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home = cfg2.dataDir;
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createHome = true;
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};
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systemd.services.prometheus2 = {
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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script = ''
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#!/bin/sh
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exec ${cfg.package}/bin/prometheus \
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${concatStringsSep " \\\n " cmdlineArgs2}
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'';
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serviceConfig = {
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User = prom2User;
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Restart = "always";
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WorkingDirectory = cfg2.dataDir;
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};
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};
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})
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];
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}
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