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prometheus-postgres-exporter: add environment file (#116373)

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* prometheus-postgres-exporter: add environment file

* Update nixos/modules/services/monitoring/prometheus/exporters/postgres.nix

Co-authored-by: WilliButz <WilliButz@users.noreply.github.com>
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Raphael Megzari 2021-03-17 09:36:31 +09:00 committed by GitHub
parent 31ced622fa
commit f295110b26
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nixos/modules/services/monitoring/prometheus/exporters/postgres.nix
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@ -30,12 +30,49 @@ in
Whether to run the exporter as the local 'postgres' super user.
'';
};
# TODO perhaps LoadCredential would be more appropriate
environmentFile = mkOption {
type = types.nullOr types.path;
default = null;
example = "/root/prometheus-postgres-exporter.env";
description = ''
Environment file as defined in <citerefentry>
<refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>.
Secrets may be passed to the service without adding them to the
world-readable Nix store, by specifying placeholder variables as
the option value in Nix and setting these variables accordingly in the
environment file.
Environment variables from this file will be interpolated into the
config file using envsubst with this syntax:
<literal>$ENVIRONMENT ''${VARIABLE}</literal>
The main use is to set the DATA_SOURCE_NAME that contains the
postgres password
note that contents from this file will override dataSourceName
if you have set it from nix.
<programlisting>
# Content of the environment file
DATA_SOURCE_NAME=postgresql://username:password@localhost:5432/postgres?sslmode=disable
</programlisting>
Note that this file needs to be available on the host on which
this exporter is running.
'';
};
};
serviceOpts = {
environment.DATA_SOURCE_NAME = cfg.dataSourceName;
serviceConfig = {
DynamicUser = false;
User = mkIf cfg.runAsLocalSuperUser (mkForce "postgres");
EnvironmentFile = mkIf (cfg.environmentFile != null) [ cfg.environmentFile ];
ExecStart = ''
${pkgs.prometheus-postgres-exporter}/bin/postgres_exporter \
--web.listen-address ${cfg.listenAddress}:${toString cfg.port} \