{ config, lib, pkgs, ... }: with lib; let cfg = config.services.elasticsearch; esConfig = '' network.host: ${cfg.host} network.port: ${toString cfg.port} network.tcp.port: ${toString cfg.tcp_port} cluster.name: ${cfg.cluster_name} ${cfg.extraConf} ''; configDir = pkgs.buildEnv { name = "elasticsearch-config"; paths = [ (pkgs.writeTextDir "elasticsearch.yml" esConfig) (pkgs.writeTextDir "logging.yml" cfg.logging) ]; }; in { ###### interface options.services.elasticsearch = { enable = mkOption { description = "Whether to enable elasticsearch."; default = false; type = types.uniq types.bool; }; host = mkOption { description = "Elasticsearch listen address."; default = "127.0.0.1"; type = types.str; }; port = mkOption { description = "Elasticsearch port to listen for HTTP traffic."; default = 9200; type = types.int; }; tcp_port = mkOption { description = "Elasticsearch port for the node to node communication."; default = 9300; type = types.int; }; cluster_name = mkOption { description = "Elasticsearch name that identifies your cluster for auto-discovery."; default = "elasticsearch"; type = types.str; }; extraConf = mkOption { description = "Extra configuration for elasticsearch."; default = ""; type = types.str; example = '' node.name: "elasticsearch" node.master: true node.data: false index.number_of_shards: 5 index.number_of_replicas: 1 ''; }; logging = mkOption { description = "Elasticsearch logging configuration."; default = '' rootLogger: INFO, console logger: action: INFO com.amazonaws: WARN appender: console: type: console layout: type: consolePattern conversionPattern: "[%d{ISO8601}][%-5p][%-25c] %m%n" ''; type = types.str; }; dataDir = mkOption { type = types.path; default = "/var/lib/elasticsearch"; description = '' Data directory for elasticsearch. ''; }; extraCmdLineOptions = mkOption { description = "Extra command line options for the elasticsearch launcher."; default = []; type = types.listOf types.string; example = [ "-Djava.net.preferIPv4Stack=true" ]; }; }; ###### implementation config = mkIf cfg.enable { systemd.services.elasticsearch = { description = "Elasticsearch daemon"; wantedBy = [ "multi-user.target" ]; after = [ "network-interfaces.target" ]; environment = { ES_HOME = cfg.dataDir; }; serviceConfig = { ExecStart = "${pkgs.elasticsearch}/bin/elasticsearch -Des.path.conf=${configDir} ${toString cfg.extraCmdLineOptions}"; User = "elasticsearch"; PermissionsStartOnly = true; }; preStart = '' mkdir -m 0700 -p ${cfg.dataDir} if [ "$(id -u)" = 0 ]; then chown -R elasticsearch ${cfg.dataDir}; fi ''; }; environment.systemPackages = [ pkgs.elasticsearch ]; users.extraUsers = singleton { name = "elasticsearch"; uid = config.ids.uids.elasticsearch; description = "Elasticsearch daemon user"; home = cfg.dataDir; }; }; }