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101 lines
3.0 KiB
Nix
101 lines
3.0 KiB
Nix
{
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lib,
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pkgs,
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config,
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...
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}:
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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 lib.maintainers; [
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flokli
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hbjydev
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];
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};
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options.services.alloy = {
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enable = lib.mkEnableOption "Grafana Alloy";
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package = lib.mkPackageOption pkgs "grafana-alloy" { };
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configPath = lib.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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All `.alloy` files in the same directory (ignoring subdirs) are also
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honored and are added to `systemd.services.alloy.reloadTriggers` to
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enable config reload 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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environmentFile = lib.mkOption {
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type = with lib.types; nullOr path;
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default = null;
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example = "/run/secrets/alloy.env";
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description = ''
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EnvironmentFile as defined in {manpage}`systemd.exec(5)`.
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'';
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};
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extraFlags = lib.mkOption {
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type = with lib.types; listOf str;
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default = [ ];
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example = [
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"--server.http.listen-addr=127.0.0.1:12346"
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"--disable-reporting"
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];
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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 = lib.mkIf cfg.enable {
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systemd.services.alloy = {
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after = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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reloadTriggers = lib.mapAttrsToList (_: v: v.source or null) (
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lib.filterAttrs (n: _: lib.hasPrefix "alloy/" n && lib.hasSuffix ".alloy" n) config.environment.etc
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);
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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} ${lib.escapeShellArgs cfg.extraFlags}";
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ExecReload = "${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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EnvironmentFile = lib.mkIf (cfg.environmentFile != null) [ cfg.environmentFile ];
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};
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};
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};
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}
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