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{ config, lib, options, pkgs, ... }:
with lib;
let
cfg = config.services.etcd;
opt = options.services.etcd;
in {
options.services.etcd = {
enable = mkOption {
description = "Whether to enable etcd.";
default = false;
type = types.bool;
};
package = mkPackageOption pkgs "etcd" { };
name = mkOption {
description = "Etcd unique node name.";
default = config.networking.hostName;
defaultText = literalExpression "config.networking.hostName";
type = types.str;
};
advertiseClientUrls = mkOption {
description = "Etcd list of this member's client URLs to advertise to the rest of the cluster.";
default = cfg.listenClientUrls;
defaultText = literalExpression "config.${opt.listenClientUrls}";
type = types.listOf types.str;
};
listenClientUrls = mkOption {
description = "Etcd list of URLs to listen on for client traffic.";
default = ["http://127.0.0.1:2379"];
type = types.listOf types.str;
};
listenPeerUrls = mkOption {
description = "Etcd list of URLs to listen on for peer traffic.";
default = ["http://127.0.0.1:2380"];
type = types.listOf types.str;
};
initialAdvertisePeerUrls = mkOption {
description = "Etcd list of this member's peer URLs to advertise to rest of the cluster.";
default = cfg.listenPeerUrls;
defaultText = literalExpression "config.${opt.listenPeerUrls}";
type = types.listOf types.str;
};
initialCluster = mkOption {
description = "Etcd initial cluster configuration for bootstrapping.";
default = ["${cfg.name}=http://127.0.0.1:2380"];
defaultText = literalExpression ''["''${config.${opt.name}}=http://127.0.0.1:2380"]'';
type = types.listOf types.str;
};
initialClusterState = mkOption {
description = "Etcd initial cluster configuration for bootstrapping.";
default = "new";
type = types.enum ["new" "existing"];
};
initialClusterToken = mkOption {
description = "Etcd initial cluster token for etcd cluster during bootstrap.";
default = "etcd-cluster";
type = types.str;
};
discovery = mkOption {
description = "Etcd discovery url";
default = "";
type = types.str;
};
clientCertAuth = mkOption {
description = "Whether to use certs for client authentication";
default = false;
type = types.bool;
};
trustedCaFile = mkOption {
description = "Certificate authority file to use for clients";
default = null;
type = types.nullOr types.path;
};
certFile = mkOption {
description = "Cert file to use for clients";
default = null;
type = types.nullOr types.path;
};
keyFile = mkOption {
description = "Key file to use for clients";
default = null;
type = types.nullOr types.path;
};
openFirewall = mkOption {
type = types.bool;
default = false;
description = ''
Open etcd ports in the firewall.
Ports opened:
- 2379/tcp for client requests
- 2380/tcp for peer communication
'';
};
peerCertFile = mkOption {
description = "Cert file to use for peer to peer communication";
default = cfg.certFile;
defaultText = literalExpression "config.${opt.certFile}";
type = types.nullOr types.path;
};
peerKeyFile = mkOption {
description = "Key file to use for peer to peer communication";
default = cfg.keyFile;
defaultText = literalExpression "config.${opt.keyFile}";
type = types.nullOr types.path;
};
peerTrustedCaFile = mkOption {
description = "Certificate authority file to use for peer to peer communication";
default = cfg.trustedCaFile;
defaultText = literalExpression "config.${opt.trustedCaFile}";
type = types.nullOr types.path;
};
peerClientCertAuth = mkOption {
description = "Whether to check all incoming peer requests from the cluster for valid client certificates signed by the supplied CA";
default = false;
type = types.bool;
};
extraConf = mkOption {
description = ''
Etcd extra configuration. See
<https://github.com/coreos/etcd/blob/master/Documentation/op-guide/configuration.md#configuration-flags>
'';
type = types.attrsOf types.str;
default = {};
example = literalExpression ''
{
"CORS" = "*";
"NAME" = "default-name";
"MAX_RESULT_BUFFER" = "1024";
"MAX_CLUSTER_SIZE" = "9";
"MAX_RETRY_ATTEMPTS" = "3";
}
'';
};
dataDir = mkOption {
type = types.path;
default = "/var/lib/etcd";
description = "Etcd data directory.";
};
};
config = mkIf cfg.enable {
systemd.tmpfiles.settings."10-etcd".${cfg.dataDir}.d = {
user = "etcd";
mode = "0700";
};
systemd.services.etcd = {
description = "etcd key-value store";
wantedBy = [ "multi-user.target" ];
after = [ "network-online.target" ]
++ lib.optional config.networking.firewall.enable "firewall.service";
wants = [ "network-online.target" ]
++ lib.optional config.networking.firewall.enable "firewall.service";
environment = (filterAttrs (n: v: v != null) {
ETCD_NAME = cfg.name;
ETCD_DISCOVERY = cfg.discovery;
ETCD_DATA_DIR = cfg.dataDir;
ETCD_ADVERTISE_CLIENT_URLS = concatStringsSep "," cfg.advertiseClientUrls;
ETCD_LISTEN_CLIENT_URLS = concatStringsSep "," cfg.listenClientUrls;
ETCD_LISTEN_PEER_URLS = concatStringsSep "," cfg.listenPeerUrls;
ETCD_INITIAL_ADVERTISE_PEER_URLS = concatStringsSep "," cfg.initialAdvertisePeerUrls;
ETCD_PEER_CLIENT_CERT_AUTH = toString cfg.peerClientCertAuth;
ETCD_PEER_TRUSTED_CA_FILE = cfg.peerTrustedCaFile;
ETCD_PEER_CERT_FILE = cfg.peerCertFile;
ETCD_PEER_KEY_FILE = cfg.peerKeyFile;
ETCD_CLIENT_CERT_AUTH = toString cfg.clientCertAuth;
ETCD_TRUSTED_CA_FILE = cfg.trustedCaFile;
ETCD_CERT_FILE = cfg.certFile;
ETCD_KEY_FILE = cfg.keyFile;
}) // (optionalAttrs (cfg.discovery == ""){
ETCD_INITIAL_CLUSTER = concatStringsSep "," cfg.initialCluster;
ETCD_INITIAL_CLUSTER_STATE = cfg.initialClusterState;
ETCD_INITIAL_CLUSTER_TOKEN = cfg.initialClusterToken;
}) // (mapAttrs' (n: v: nameValuePair "ETCD_${n}" v) cfg.extraConf);
unitConfig = {
Documentation = "https://github.com/coreos/etcd";
};
serviceConfig = {
Type = "notify";
Restart = "always";
RestartSec = "30s";
ExecStart = "${cfg.package}/bin/etcd";
User = "etcd";
LimitNOFILE = 40000;
};
};
environment.systemPackages = [ cfg.package ];
networking.firewall = lib.mkIf cfg.openFirewall {
allowedTCPPorts = [
2379 # for client requests
2380 # for peer communication
];
};
users.users.etcd = {
isSystemUser = true;
group = "etcd";
description = "Etcd daemon user";
home = cfg.dataDir;
};
users.groups.etcd = {};
};
}
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