419 lines
14 KiB
Nix
419 lines
14 KiB
Nix
{ config, lib, pkgs, ... }:
|
|
|
|
with lib;
|
|
|
|
let
|
|
cfg = config.services.exhibitor;
|
|
exhibitor = cfg.package;
|
|
exhibitorConfig = ''
|
|
zookeeper-install-directory=${cfg.baseDir}/zookeeper
|
|
zookeeper-data-directory=${cfg.zkDataDir}
|
|
zookeeper-log-directory=${cfg.zkLogDir}
|
|
zoo-cfg-extra=${cfg.zkExtraCfg}
|
|
client-port=${toString cfg.zkClientPort}
|
|
connect-port=${toString cfg.zkConnectPort}
|
|
election-port=${toString cfg.zkElectionPort}
|
|
cleanup-period-ms=${toString cfg.zkCleanupPeriod}
|
|
servers-spec=${concatStringsSep "," cfg.zkServersSpec}
|
|
auto-manage-instances=${toString cfg.autoManageInstances}
|
|
${cfg.extraConf}
|
|
'';
|
|
# NB: toString rather than lib.boolToString on cfg.autoManageInstances is intended.
|
|
# Exhibitor tests if it's an integer not equal to 0, so the empty string (toString false)
|
|
# will operate in the same fashion as a 0.
|
|
configDir = pkgs.writeTextDir "exhibitor.properties" exhibitorConfig;
|
|
cliOptionsCommon = {
|
|
configtype = cfg.configType;
|
|
defaultconfig = "${configDir}/exhibitor.properties";
|
|
port = toString cfg.port;
|
|
hostname = cfg.hostname;
|
|
headingtext = if (cfg.headingText != null) then (lib.escapeShellArg cfg.headingText) else null;
|
|
nodemodification = lib.boolToString cfg.nodeModification;
|
|
configcheckms = toString cfg.configCheckMs;
|
|
jquerystyle = cfg.jqueryStyle;
|
|
loglines = toString cfg.logLines;
|
|
servo = lib.boolToString cfg.servo;
|
|
timeout = toString cfg.timeout;
|
|
};
|
|
s3CommonOptions = { s3region = cfg.s3Region; s3credentials = cfg.s3Credentials; };
|
|
cliOptionsPerConfig = {
|
|
s3 = {
|
|
s3config = "${cfg.s3Config.bucketName}:${cfg.s3Config.objectKey}";
|
|
s3configprefix = cfg.s3Config.configPrefix;
|
|
};
|
|
zookeeper = {
|
|
zkconfigconnect = concatStringsSep "," cfg.zkConfigConnect;
|
|
zkconfigexhibitorpath = cfg.zkConfigExhibitorPath;
|
|
zkconfigpollms = toString cfg.zkConfigPollMs;
|
|
zkconfigretry = "${toString cfg.zkConfigRetry.sleepMs}:${toString cfg.zkConfigRetry.retryQuantity}";
|
|
zkconfigzpath = cfg.zkConfigZPath;
|
|
zkconfigexhibitorport = toString cfg.zkConfigExhibitorPort; # NB: This might be null
|
|
};
|
|
file = {
|
|
fsconfigdir = cfg.fsConfigDir;
|
|
fsconfiglockprefix = cfg.fsConfigLockPrefix;
|
|
fsConfigName = fsConfigName;
|
|
};
|
|
none = {
|
|
noneconfigdir = configDir;
|
|
};
|
|
};
|
|
cliOptions = concatStringsSep " " (mapAttrsToList (k: v: "--${k} ${v}") (filterAttrs (k: v: v != null && v != "") (cliOptionsCommon //
|
|
cliOptionsPerConfig."${cfg.configType}" //
|
|
s3CommonOptions //
|
|
optionalAttrs cfg.s3Backup { s3backup = "true"; } //
|
|
optionalAttrs cfg.fileSystemBackup { filesystembackup = "true"; }
|
|
)));
|
|
in
|
|
{
|
|
options = {
|
|
services.exhibitor = {
|
|
enable = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = "
|
|
Whether to enable the exhibitor server.
|
|
";
|
|
};
|
|
# See https://github.com/soabase/exhibitor/wiki/Running-Exhibitor for what these mean
|
|
# General options for any type of config
|
|
port = mkOption {
|
|
type = types.int;
|
|
default = 8080;
|
|
description = ''
|
|
The port for exhibitor to listen on and communicate with other exhibitors.
|
|
'';
|
|
};
|
|
baseDir = mkOption {
|
|
type = types.str;
|
|
default = "/var/exhibitor";
|
|
description = ''
|
|
Baseline directory for exhibitor runtime config.
|
|
'';
|
|
};
|
|
configType = mkOption {
|
|
type = types.enum [ "file" "s3" "zookeeper" "none" ];
|
|
description = ''
|
|
Which configuration type you want to use. Additional config will be
|
|
required depending on which type you are using.
|
|
'';
|
|
};
|
|
hostname = mkOption {
|
|
type = types.nullOr types.str;
|
|
description = ''
|
|
Hostname to use and advertise
|
|
'';
|
|
default = null;
|
|
};
|
|
nodeModification = mkOption {
|
|
type = types.bool;
|
|
description = ''
|
|
Whether the Explorer UI will allow nodes to be modified (use with caution).
|
|
'';
|
|
default = true;
|
|
};
|
|
configCheckMs = mkOption {
|
|
type = types.int;
|
|
description = ''
|
|
Period (ms) to check for shared config updates.
|
|
'';
|
|
default = 30000;
|
|
};
|
|
headingText = mkOption {
|
|
type = types.nullOr types.str;
|
|
description = ''
|
|
Extra text to display in UI header
|
|
'';
|
|
default = null;
|
|
};
|
|
jqueryStyle = mkOption {
|
|
type = types.enum [ "red" "black" "custom" ];
|
|
description = ''
|
|
Styling used for the JQuery-based UI.
|
|
'';
|
|
default = "red";
|
|
};
|
|
logLines = mkOption {
|
|
type = types.int;
|
|
description = ''
|
|
Max lines of logging to keep in memory for display.
|
|
'';
|
|
default = 1000;
|
|
};
|
|
servo = mkOption {
|
|
type = types.bool;
|
|
description = ''
|
|
ZooKeeper will be queried once a minute for its state via the 'mntr' four
|
|
letter word (this requires ZooKeeper 3.4.x+). Servo will be used to publish
|
|
this data via JMX.
|
|
'';
|
|
default = false;
|
|
};
|
|
timeout = mkOption {
|
|
type = types.int;
|
|
description = ''
|
|
Connection timeout (ms) for ZK connections.
|
|
'';
|
|
default = 30000;
|
|
};
|
|
autoManageInstances = mkOption {
|
|
type = types.bool;
|
|
description = ''
|
|
Automatically manage ZooKeeper instances in the ensemble
|
|
'';
|
|
default = false;
|
|
};
|
|
zkDataDir = mkOption {
|
|
type = types.str;
|
|
default = "${cfg.baseDir}/zkData";
|
|
description = ''
|
|
The Zookeeper data directory
|
|
'';
|
|
};
|
|
zkLogDir = mkOption {
|
|
type = types.path;
|
|
default = "${cfg.baseDir}/zkLogs";
|
|
description = ''
|
|
The Zookeeper logs directory
|
|
'';
|
|
};
|
|
extraConf = mkOption {
|
|
type = types.str;
|
|
default = "";
|
|
description = ''
|
|
Extra Exhibitor configuration to put in the ZooKeeper config file.
|
|
'';
|
|
};
|
|
zkExtraCfg = mkOption {
|
|
type = types.str;
|
|
default = ''initLimit=5&syncLimit=2&tickTime=2000'';
|
|
description = ''
|
|
Extra options to pass into Zookeeper
|
|
'';
|
|
};
|
|
zkClientPort = mkOption {
|
|
type = types.int;
|
|
default = 2181;
|
|
description = ''
|
|
Zookeeper client port
|
|
'';
|
|
};
|
|
zkConnectPort = mkOption {
|
|
type = types.int;
|
|
default = 2888;
|
|
description = ''
|
|
The port to use for followers to talk to each other.
|
|
'';
|
|
};
|
|
zkElectionPort = mkOption {
|
|
type = types.int;
|
|
default = 3888;
|
|
description = ''
|
|
The port for Zookeepers to use for leader election.
|
|
'';
|
|
};
|
|
zkCleanupPeriod = mkOption {
|
|
type = types.int;
|
|
default = 0;
|
|
description = ''
|
|
How often (in milliseconds) to run the Zookeeper log cleanup task.
|
|
'';
|
|
};
|
|
zkServersSpec = mkOption {
|
|
type = types.listOf types.str;
|
|
default = [];
|
|
description = ''
|
|
Zookeeper server spec for all servers in the ensemble.
|
|
'';
|
|
example = [ "S:1:zk1.example.com" "S:2:zk2.example.com" "S:3:zk3.example.com" "O:4:zk-observer.example.com" ];
|
|
};
|
|
|
|
# Backup options
|
|
s3Backup = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = ''
|
|
Whether to enable backups to S3
|
|
'';
|
|
};
|
|
fileSystemBackup = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = ''
|
|
Enables file system backup of ZooKeeper log files
|
|
'';
|
|
};
|
|
|
|
# Options for using zookeeper configType
|
|
zkConfigConnect = mkOption {
|
|
type = types.listOf types.str;
|
|
description = ''
|
|
The initial connection string for ZooKeeper shared config storage
|
|
'';
|
|
example = ["host1:2181" "host2:2181"];
|
|
};
|
|
zkConfigExhibitorPath = mkOption {
|
|
type = types.string;
|
|
description = ''
|
|
If the ZooKeeper shared config is also running Exhibitor, the URI path for the REST call
|
|
'';
|
|
default = "/";
|
|
};
|
|
zkConfigExhibitorPort = mkOption {
|
|
type = types.nullOr types.int;
|
|
description = ''
|
|
If the ZooKeeper shared config is also running Exhibitor, the port that
|
|
Exhibitor is listening on. IMPORTANT: if this value is not set it implies
|
|
that Exhibitor is not being used on the ZooKeeper shared config.
|
|
'';
|
|
};
|
|
zkConfigPollMs = mkOption {
|
|
type = types.int;
|
|
description = ''
|
|
The period in ms to check for changes in the config ensemble
|
|
'';
|
|
default = 10000;
|
|
};
|
|
zkConfigRetry = {
|
|
sleepMs = mkOption {
|
|
type = types.int;
|
|
default = 1000;
|
|
description = ''
|
|
Retry sleep time connecting to the ZooKeeper config
|
|
'';
|
|
};
|
|
retryQuantity = mkOption {
|
|
type = types.int;
|
|
default = 3;
|
|
description = ''
|
|
Retries connecting to the ZooKeeper config
|
|
'';
|
|
};
|
|
};
|
|
zkConfigZPath = mkOption {
|
|
type = types.str;
|
|
description = ''
|
|
The base ZPath that Exhibitor should use
|
|
'';
|
|
example = "/exhibitor/config";
|
|
};
|
|
|
|
# Config options for s3 configType
|
|
s3Config = {
|
|
bucketName = mkOption {
|
|
type = types.str;
|
|
description = ''
|
|
Bucket name to store config
|
|
'';
|
|
};
|
|
objectKey = mkOption {
|
|
type = types.str;
|
|
description = ''
|
|
S3 key name to store the config
|
|
'';
|
|
};
|
|
configPrefix = mkOption {
|
|
type = types.str;
|
|
description = ''
|
|
When using AWS S3 shared config files, the prefix to use for values such as locks
|
|
'';
|
|
default = "exhibitor-";
|
|
};
|
|
};
|
|
|
|
# The next two are used for either s3backup or s3 configType
|
|
s3Credentials = mkOption {
|
|
type = types.nullOr types.path;
|
|
description = ''
|
|
Optional credentials to use for s3backup or s3config. Argument is the path
|
|
to an AWS credential properties file with two properties:
|
|
com.netflix.exhibitor.s3.access-key-id and com.netflix.exhibitor.s3.access-secret-key
|
|
'';
|
|
default = null;
|
|
};
|
|
s3Region = mkOption {
|
|
type = types.nullOr types.str;
|
|
description = ''
|
|
Optional region for S3 calls
|
|
'';
|
|
default = null;
|
|
};
|
|
|
|
# Config options for file config type
|
|
fsConfigDir = mkOption {
|
|
type = types.path;
|
|
description = ''
|
|
Directory to store Exhibitor properties (cannot be used with s3config).
|
|
Exhibitor uses file system locks so you can specify a shared location
|
|
so as to enable complete ensemble management.
|
|
'';
|
|
};
|
|
fsConfigLockPrefix = mkOption {
|
|
type = types.str;
|
|
description = ''
|
|
A prefix for a locking mechanism used in conjunction with fsconfigdir
|
|
'';
|
|
default = "exhibitor-lock-";
|
|
};
|
|
fsConfigName = mkOption {
|
|
type = types.str;
|
|
description = ''
|
|
The name of the file to store config in
|
|
'';
|
|
default = "exhibitor.properties";
|
|
};
|
|
};
|
|
};
|
|
|
|
config = mkIf cfg.enable {
|
|
systemd.services.exhibitor = {
|
|
description = "Exhibitor Daemon";
|
|
wantedBy = [ "multi-user.target" ];
|
|
after = [ "network.target" ];
|
|
environment = {
|
|
ZOO_LOG_DIR = cfg.baseDir;
|
|
};
|
|
serviceConfig = {
|
|
/***
|
|
Exhibitor is a bit un-nixy. It wants to present to you a user interface in order to
|
|
mutate the configuration of both itself and ZooKeeper, and to coordinate changes
|
|
among the members of the Zookeeper ensemble. I'm going for a different approach here,
|
|
which is to manage all the configuration via nix and have it write out the configuration
|
|
files that exhibitor will use, and to reduce the amount of inter-exhibitor orchestration.
|
|
***/
|
|
ExecStart = ''
|
|
${pkgs.exhibitor}/bin/startExhibitor.sh ${cliOptions}
|
|
'';
|
|
User = "zookeeper";
|
|
PermissionsStartOnly = true;
|
|
};
|
|
# This is a bit wonky, but the reason for this is that Exhibitor tries to write to
|
|
# ${cfg.baseDir}/zookeeper/bin/../conf/zoo.cfg
|
|
# I want everything but the conf directory to be in the immutable nix store, and I want defaults
|
|
# from the nix store
|
|
# If I symlink the bin directory in, then bin/../ will resolve to the parent of the symlink in the
|
|
# immutable nix store. Bind mounting a writable conf over the existing conf might work, but it gets very
|
|
# messy with trying to copy the existing out into a mutable store.
|
|
# Another option is to try to patch upstream exhibitor, but the current package just pulls down the
|
|
# prebuild JARs off of Maven, rather than building them ourselves, as Maven support in Nix isn't
|
|
# very mature. So, it seems like a reasonable compromise is to just copy out of the immutable store
|
|
# just before starting the service, so we're running binaries from the immutable store, but we work around
|
|
# Exhibitor's desire to mutate its current installation.
|
|
preStart = ''
|
|
mkdir -m 0700 -p ${cfg.baseDir}/zookeeper
|
|
# Not doing a chown -R to keep the base ZK files owned by root
|
|
chown zookeeper ${cfg.baseDir} ${cfg.baseDir}/zookeeper
|
|
cp -Rf ${pkgs.zookeeper}/* ${cfg.baseDir}/zookeeper
|
|
chown -R zookeeper ${cfg.baseDir}/zookeeper/conf
|
|
chmod -R u+w ${cfg.baseDir}/zookeeper/conf
|
|
'';
|
|
};
|
|
users.users = singleton {
|
|
name = "zookeeper";
|
|
uid = config.ids.uids.zookeeper;
|
|
description = "Zookeeper daemon user";
|
|
home = cfg.baseDir;
|
|
};
|
|
};
|
|
}
|