72 lines
2 KiB
Nix
72 lines
2 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.epmd;
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in
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{
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###### interface
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options.services.epmd = {
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enable = 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 enable socket activation for Erlang Port Mapper Daemon (epmd),
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which acts as a name server on all hosts involved in distributed
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Erlang computations.
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'';
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};
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package = mkOption {
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type = types.package;
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default = pkgs.erlang;
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defaultText = literalExpression "pkgs.erlang";
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description = ''
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The Erlang package to use to get epmd binary. That way you can re-use
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an Erlang runtime that is already installed for other purposes.
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'';
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};
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listenStream = mkOption
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{
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type = types.str;
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default = "[::]:4369";
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description = ''
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the listenStream used by the systemd socket.
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see https://www.freedesktop.org/software/systemd/man/systemd.socket.html#ListenStream= for more informations.
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use this to change the port epmd will run on.
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if not defined, epmd will use "[::]:4369"
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'';
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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assertions = [{
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assertion = cfg.listenStream == "[::]:4369" -> config.networking.enableIPv6;
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message = "epmd listens by default on ipv6, enable ipv6 or change config.services.epmd.listenStream";
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}];
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systemd.sockets.epmd = rec {
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description = "Erlang Port Mapper Daemon Activation Socket";
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wantedBy = [ "sockets.target" ];
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before = wantedBy;
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socketConfig = {
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ListenStream = cfg.listenStream;
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Accept = "false";
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};
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};
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systemd.services.epmd = {
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description = "Erlang Port Mapper Daemon";
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after = [ "network.target" ];
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requires = [ "epmd.socket" ];
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serviceConfig = {
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DynamicUser = true;
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ExecStart = "${cfg.package}/bin/epmd -systemd";
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Type = "notify";
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};
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};
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};
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meta.maintainers = teams.beam.members;
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}
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