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