nixpkgs/nixos/modules/services/monitoring/loki.nix
lucasew 4c621ef886 nixos/loki: add network.target to after
Signed-off-by: lucasew <lucas59356@gmail.com>
2024-05-28 12:02:04 -03:00

130 lines
3.4 KiB
Nix

{ config, lib, pkgs, ... }:
let
inherit (lib) escapeShellArgs mkEnableOption mkIf mkOption types;
cfg = config.services.loki;
prettyJSON = conf:
pkgs.runCommand "loki-config.json" { } ''
echo '${builtins.toJSON conf}' | ${pkgs.jq}/bin/jq 'del(._module)' > $out
'';
in {
options.services.loki = {
enable = mkEnableOption "loki";
user = mkOption {
type = types.str;
default = "loki";
description = ''
User under which the Loki service runs.
'';
};
package = lib.mkPackageOption pkgs "grafana-loki" { };
group = mkOption {
type = types.str;
default = "loki";
description = ''
Group under which the Loki service runs.
'';
};
dataDir = mkOption {
type = types.path;
default = "/var/lib/loki";
description = ''
Specify the directory for Loki.
'';
};
configuration = mkOption {
type = (pkgs.formats.json {}).type;
default = {};
description = ''
Specify the configuration for Loki in Nix.
'';
};
configFile = mkOption {
type = types.nullOr types.path;
default = null;
description = ''
Specify a configuration file that Loki should use.
'';
};
extraFlags = mkOption {
type = types.listOf types.str;
default = [];
example = [ "--server.http-listen-port=3101" ];
description = ''
Specify a list of additional command line flags,
which get escaped and are then passed to Loki.
'';
};
};
config = mkIf cfg.enable {
assertions = [{
assertion = (
(cfg.configuration == {} -> cfg.configFile != null) &&
(cfg.configFile != null -> cfg.configuration == {})
);
message = ''
Please specify either
'services.loki.configuration' or
'services.loki.configFile'.
'';
}];
environment.systemPackages = [ cfg.package ]; # logcli
users.groups.${cfg.group} = { };
users.users.${cfg.user} = {
description = "Loki Service User";
group = cfg.group;
home = cfg.dataDir;
createHome = true;
isSystemUser = true;
};
systemd.services.loki = {
description = "Loki Service Daemon";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
serviceConfig = let
conf = if cfg.configFile == null
then
# Config validation may fail when using extraFlags = [ "-config.expand-env=true" ].
# To work around this, we simply skip it when extraFlags is not empty.
if cfg.extraFlags == []
then validateConfig (prettyJSON cfg.configuration)
else prettyJSON cfg.configuration
else cfg.configFile;
validateConfig = file:
pkgs.runCommand "validate-loki-conf" {
nativeBuildInputs = [ cfg.package ];
} ''
loki -verify-config -config.file "${file}"
ln -s "${file}" "$out"
'';
in
{
ExecStart = "${cfg.package}/bin/loki --config.file=${conf} ${escapeShellArgs cfg.extraFlags}";
User = cfg.user;
Restart = "always";
PrivateTmp = true;
ProtectHome = true;
ProtectSystem = "full";
DevicePolicy = "closed";
NoNewPrivileges = true;
WorkingDirectory = cfg.dataDir;
};
};
};
}