29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
126 lines
3 KiB
Nix
126 lines
3 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.elasticsearch;
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esConfig = ''
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network.host: ${cfg.host}
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network.port: ${toString cfg.port}
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network.tcp.port: ${toString cfg.tcp_port}
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cluster.name: ${cfg.cluster_name}
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${cfg.extraConf}
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'';
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configDir = pkgs.buildEnv {
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name = "elasticsearch-config";
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paths = [
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(pkgs.writeTextDir "elasticsearch.yml" esConfig)
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(pkgs.writeTextDir "logging.yml" cfg.logging)
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];
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};
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in {
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###### interface
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options.services.elasticsearch = {
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enable = mkOption {
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description = "Whether to enable elasticsearch";
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default = false;
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type = types.uniq types.bool;
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};
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host = mkOption {
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description = "Elasticsearch listen address";
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default = "127.0.0.1";
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type = types.str;
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};
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port = mkOption {
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description = "Elasticsearch port to listen for HTTP traffic";
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default = 9200;
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type = types.int;
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};
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tcp_port = mkOption {
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description = "Elasticsearch port for the node to node communication";
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default = 9300;
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type = types.int;
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};
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cluster_name = mkOption {
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description = "Elasticsearch name that identifies your cluster for auto-discovery";
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default = "elasticsearch";
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type = types.str;
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};
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extraConf = mkOption {
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description = "Extra configuration for elasticsearch";
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default = "";
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type = types.str;
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example = ''
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node.name: "elasticsearch"
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node.master: true
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node.data: false
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index.number_of_shards: 5
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index.number_of_replicas: 1
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'';
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};
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logging = mkOption {
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description = "Elasticsearch logging configuration";
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default = ''
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rootLogger: INFO, console
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logger:
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action: INFO
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com.amazonaws: WARN
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appender:
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console:
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type: console
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layout:
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type: consolePattern
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conversionPattern: "[%d{ISO8601}][%-5p][%-25c] %m%n"
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'';
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type = types.str;
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};
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dataDir = mkOption {
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type = types.path;
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default = "/var/lib/elasticsearch";
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description = ''
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Data directory for elasticsearch.
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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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systemd.services.elasticsearch = {
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description = "Elasticsearch daemon";
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wantedBy = [ "multi-user.target" ];
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after = [ "network-interfaces.target" ];
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environment = { ES_HOME = cfg.dataDir; };
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serviceConfig = {
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ExecStart = "${pkgs.elasticsearch}/bin/elasticsearch -f -Des.path.conf=${configDir}";
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User = "elasticsearch";
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};
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preStart = ''
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mkdir -m 0700 -p ${cfg.dataDir}
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if [ "$(id -u)" = 0 ]; then chown -R elasticsearch ${cfg.dataDir}; fi
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'';
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};
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environment.systemPackages = [ pkgs.elasticsearch ];
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users.extraUsers = singleton {
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name = "elasticsearch";
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uid = config.ids.uids.elasticsearch;
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description = "Elasticsearch daemon user";
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home = cfg.dataDir;
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};
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};
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}
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