92 lines
2.7 KiB
Nix
92 lines
2.7 KiB
Nix
{ config, lib, pkgs, options, ... }:
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let
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cfg = config.services.prometheus.exporters.postgres;
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inherit (lib)
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mkOption
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types
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mkIf
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mkForce
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concatStringsSep
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;
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in
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{
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port = 9187;
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extraOpts = {
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telemetryPath = mkOption {
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type = types.str;
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default = "/metrics";
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description = ''
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Path under which to expose metrics.
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'';
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};
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dataSourceName = mkOption {
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type = types.str;
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default = "user=postgres database=postgres host=/run/postgresql sslmode=disable";
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example = "postgresql://username:password@localhost:5432/postgres?sslmode=disable";
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description = ''
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Accepts PostgreSQL URI form and key=value form arguments.
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'';
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};
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runAsLocalSuperUser = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to run the exporter as the local 'postgres' super user.
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'';
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};
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# TODO perhaps LoadCredential would be more appropriate
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environmentFile = mkOption {
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type = types.nullOr types.path;
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default = null;
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example = "/root/prometheus-postgres-exporter.env";
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description = ''
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Environment file as defined in {manpage}`systemd.exec(5)`.
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Secrets may be passed to the service without adding them to the
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world-readable Nix store, by specifying placeholder variables as
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the option value in Nix and setting these variables accordingly in the
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environment file.
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Environment variables from this file will be interpolated into the
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config file using envsubst with this syntax:
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`$ENVIRONMENT ''${VARIABLE}`
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The main use is to set the DATA_SOURCE_NAME that contains the
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postgres password
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note that contents from this file will override dataSourceName
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if you have set it from nix.
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```
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# Content of the environment file
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DATA_SOURCE_NAME=postgresql://username:password@localhost:5432/postgres?sslmode=disable
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```
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Note that this file needs to be available on the host on which
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this exporter is running.
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'';
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};
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};
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serviceOpts = {
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environment.DATA_SOURCE_NAME = cfg.dataSourceName;
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serviceConfig = {
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DynamicUser = false;
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User = mkIf cfg.runAsLocalSuperUser (mkForce "postgres");
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EnvironmentFile = mkIf (cfg.environmentFile != null) [ cfg.environmentFile ];
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ExecStart = ''
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${pkgs.prometheus-postgres-exporter}/bin/postgres_exporter \
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--web.listen-address ${cfg.listenAddress}:${toString cfg.port} \
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--web.telemetry-path ${cfg.telemetryPath} \
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${concatStringsSep " \\\n " cfg.extraFlags}
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'';
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RestrictAddressFamilies = [
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# Need AF_UNIX to collect data
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"AF_UNIX"
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];
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};
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};
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}
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