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{ 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;
};
};
}
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