80 lines
2.6 KiB
Nix
80 lines
2.6 KiB
Nix
{ lib, pkgs, config, ... }:
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with lib;
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let
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cfg = config.services.alloy;
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in
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{
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meta = {
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maintainers = with maintainers; [ flokli hbjydev ];
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};
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options.services.alloy = {
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enable = mkEnableOption "Grafana Alloy";
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package = mkPackageOption pkgs "grafana-alloy" { };
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configPath = mkOption {
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type = lib.types.path;
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default = "/etc/alloy";
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description = ''
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Alloy configuration file/directory path.
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We default to `/etc/alloy` here, and expect the user to configure a
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configuration file via `environment.etc."alloy/config.alloy"`.
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This allows config reload, contrary to specifying a store path.
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A `reloadTrigger` for `config.alloy` is configured.
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Other `*.alloy` files in the same directory (ignoring subdirs) are also
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honored, but it's necessary to manually extend
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`systemd.services.alloy.reloadTriggers` to enable config reload
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during nixos-rebuild switch.
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This can also point to another directory containing `*.alloy` files, or
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a single Alloy file in the Nix store (at the cost of reload).
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Component names must be unique across all Alloy configuration files, and
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configuration blocks must not be repeated.
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Alloy will continue to run if subsequent reloads of the configuration
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file fail, potentially marking components as unhealthy depending on
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the nature of the failure. When this happens, Alloy will continue
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functioning in the last valid state.
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'';
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};
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extraFlags = mkOption {
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type = with lib.types; listOf str;
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default = [ ];
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example = [ "--server.http.listen-addr=127.0.0.1:12346" "--disable-reporting" ];
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description = ''
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Extra command-line flags passed to {command}`alloy run`.
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See <https://grafana.com/docs/alloy/latest/reference/cli/run/>
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'';
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};
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};
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config = mkIf cfg.enable {
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systemd.services.alloy = {
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wantedBy = [ "multi-user.target" ];
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reloadTriggers = [ config.environment.etc."alloy/config.alloy".source or null ];
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serviceConfig = {
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Restart = "always";
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DynamicUser = true;
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RestartSec = 2;
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SupplementaryGroups = [
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# allow to read the systemd journal for loki log forwarding
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"systemd-journal"
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];
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ExecStart = "${lib.getExe cfg.package} run ${cfg.configPath} ${escapeShellArgs cfg.extraFlags}";
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ExecReload = "${pkgs.coreutils}/bin/kill -SIGHUP $MAINPID";
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ConfigurationDirectory = "alloy";
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StateDirectory = "alloy";
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WorkingDirectory = "%S/alloy";
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Type = "simple";
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};
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};
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};
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}
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