diff options
Diffstat (limited to 'nixos/modules/services/monitoring/prometheus/alertmanager.nix')
| -rw-r--r-- | nixos/modules/services/monitoring/prometheus/alertmanager.nix | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/nixos/modules/services/monitoring/prometheus/alertmanager.nix b/nixos/modules/services/monitoring/prometheus/alertmanager.nix new file mode 100644 index 00000000000..1f396634ae0 --- /dev/null +++ b/nixos/modules/services/monitoring/prometheus/alertmanager.nix @@ -0,0 +1,187 @@ +{ config, pkgs, lib, ... }: + +with lib; + +let + cfg = config.services.prometheus.alertmanager; + mkConfigFile = pkgs.writeText "alertmanager.yml" (builtins.toJSON cfg.configuration); + + checkedConfig = file: pkgs.runCommand "checked-config" { buildInputs = [ cfg.package ]; } '' + ln -s ${file} $out + amtool check-config $out + ''; + + alertmanagerYml = let + yml = if cfg.configText != null then + pkgs.writeText "alertmanager.yml" cfg.configText + else mkConfigFile; + in checkedConfig yml; + + cmdlineArgs = cfg.extraFlags ++ [ + "--config.file /tmp/alert-manager-substituted.yaml" + "--web.listen-address ${cfg.listenAddress}:${toString cfg.port}" + "--log.level ${cfg.logLevel}" + "--storage.path /var/lib/alertmanager" + (toString (map (peer: "--cluster.peer ${peer}:9094") cfg.clusterPeers)) + ] ++ (optional (cfg.webExternalUrl != null) + "--web.external-url ${cfg.webExternalUrl}" + ) ++ (optional (cfg.logFormat != null) + "--log.format ${cfg.logFormat}" + ); +in { + imports = [ + (mkRemovedOptionModule [ "services" "prometheus" "alertmanager" "user" ] "The alertmanager service is now using systemd's DynamicUser mechanism which obviates a user setting.") + (mkRemovedOptionModule [ "services" "prometheus" "alertmanager" "group" ] "The alertmanager service is now using systemd's DynamicUser mechanism which obviates a group setting.") + (mkRemovedOptionModule [ "services" "prometheus" "alertmanagerURL" ] '' + Due to incompatibility, the alertmanagerURL option has been removed, + please use 'services.prometheus2.alertmanagers' instead. + '') + ]; + + options = { + services.prometheus.alertmanager = { + enable = mkEnableOption "Prometheus Alertmanager"; + + package = mkOption { + type = types.package; + default = pkgs.prometheus-alertmanager; + defaultText = literalExpression "pkgs.alertmanager"; + description = '' + Package that should be used for alertmanager. + ''; + }; + + configuration = mkOption { + type = types.nullOr types.attrs; + default = null; + description = '' + Alertmanager configuration as nix attribute set. + ''; + }; + + configText = mkOption { + type = types.nullOr types.lines; + default = null; + description = '' + Alertmanager configuration as YAML text. If non-null, this option + defines the text that is written to alertmanager.yml. If null, the + contents of alertmanager.yml is generated from the structured config + options. + ''; + }; + + logFormat = mkOption { + type = types.nullOr types.str; + default = null; + description = '' + If set use a syslog logger or JSON logging. + ''; + }; + + logLevel = mkOption { + type = types.enum ["debug" "info" "warn" "error" "fatal"]; + default = "warn"; + description = '' + Only log messages with the given severity or above. + ''; + }; + + webExternalUrl = mkOption { + type = types.nullOr types.str; + default = null; + description = '' + The URL under which Alertmanager is externally reachable (for example, if Alertmanager is served via a reverse proxy). + Used for generating relative and absolute links back to Alertmanager itself. + If the URL has a path portion, it will be used to prefix all HTTP endoints served by Alertmanager. + If omitted, relevant URL components will be derived automatically. + ''; + }; + + listenAddress = mkOption { + type = types.str; + default = ""; + description = '' + Address to listen on for the web interface and API. Empty string will listen on all interfaces. + "localhost" will listen on 127.0.0.1 (but not ::1). + ''; + }; + + port = mkOption { + type = types.int; + default = 9093; + description = '' + Port to listen on for the web interface and API. + ''; + }; + + openFirewall = mkOption { + type = types.bool; + default = false; + description = '' + Open port in firewall for incoming connections. + ''; + }; + + clusterPeers = mkOption { + type = types.listOf types.str; + default = []; + description = '' + Initial peers for HA cluster. + ''; + }; + + extraFlags = mkOption { + type = types.listOf types.str; + default = []; + description = '' + Extra commandline options when launching the Alertmanager. + ''; + }; + + environmentFile = mkOption { + type = types.nullOr types.path; + default = null; + example = "/root/alertmanager.env"; + description = '' + File to load as environment file. Environment variables + from this file will be interpolated into the config file + using envsubst with this syntax: + <literal>$ENVIRONMENT ''${VARIABLE}</literal> + ''; + }; + }; + }; + + config = mkMerge [ + (mkIf cfg.enable { + assertions = singleton { + assertion = cfg.configuration != null || cfg.configText != null; + message = "Can not enable alertmanager without a configuration. " + + "Set either the `configuration` or `configText` attribute."; + }; + }) + (mkIf cfg.enable { + networking.firewall.allowedTCPPorts = optional cfg.openFirewall cfg.port; + + systemd.services.alertmanager = { + wantedBy = [ "multi-user.target" ]; + after = [ "network-online.target" ]; + preStart = '' + ${lib.getBin pkgs.envsubst}/bin/envsubst -o "/tmp/alert-manager-substituted.yaml" \ + -i "${alertmanagerYml}" + ''; + serviceConfig = { + Restart = "always"; + StateDirectory = "alertmanager"; + DynamicUser = true; # implies PrivateTmp + EnvironmentFile = lib.mkIf (cfg.environmentFile != null) cfg.environmentFile; + WorkingDirectory = "/tmp"; + ExecStart = "${cfg.package}/bin/alertmanager" + + optionalString (length cmdlineArgs != 0) (" \\\n " + + concatStringsSep " \\\n " cmdlineArgs); + ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID"; + }; + }; + }) + ]; +} |