324 lines
10 KiB
Nix
324 lines
10 KiB
Nix
{ config, lib, options, pkgs, ... }:
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let
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cfg = config.services.zabbixProxy;
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opt = options.services.zabbixProxy;
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pgsql = config.services.postgresql;
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mysql = config.services.mysql;
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inherit (lib) mkAfter mkDefault mkEnableOption mkIf mkMerge mkOption;
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inherit (lib) attrValues concatMapStringsSep getName literalExpression optional optionalAttrs optionalString types;
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inherit (lib.generators) toKeyValue;
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user = "zabbix";
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group = "zabbix";
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runtimeDir = "/run/zabbix";
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stateDir = "/var/lib/zabbix";
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passwordFile = "${runtimeDir}/zabbix-dbpassword.conf";
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moduleEnv = pkgs.symlinkJoin {
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name = "zabbix-proxy-module-env";
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paths = attrValues cfg.modules;
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};
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configFile = pkgs.writeText "zabbix_proxy.conf" (toKeyValue { listsAsDuplicateKeys = true; } cfg.settings);
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mysqlLocal = cfg.database.createLocally && cfg.database.type == "mysql";
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pgsqlLocal = cfg.database.createLocally && cfg.database.type == "pgsql";
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in
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{
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imports = [
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(lib.mkRemovedOptionModule [ "services" "zabbixProxy" "extraConfig" ] "Use services.zabbixProxy.settings instead.")
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];
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# interface
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options = {
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services.zabbixProxy = {
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enable = mkEnableOption "the Zabbix Proxy";
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server = mkOption {
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type = types.str;
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description = ''
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The IP address or hostname of the Zabbix server to connect to.
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'';
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};
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package = mkOption {
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type = types.package;
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default =
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if cfg.database.type == "mysql" then pkgs.zabbix.proxy-mysql
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else if cfg.database.type == "pgsql" then pkgs.zabbix.proxy-pgsql
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else pkgs.zabbix.proxy-sqlite;
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defaultText = literalExpression "pkgs.zabbix.proxy-pgsql";
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description = "The Zabbix package to use.";
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};
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extraPackages = mkOption {
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type = types.listOf types.package;
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default = with pkgs; [ nettools nmap traceroute ];
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defaultText = literalExpression "[ nettools nmap traceroute ]";
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description = ''
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Packages to be added to the Zabbix <envar>PATH</envar>.
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Typically used to add executables for scripts, but can be anything.
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'';
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};
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modules = mkOption {
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type = types.attrsOf types.package;
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description = "A set of modules to load.";
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default = {};
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example = literalExpression ''
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{
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"dummy.so" = pkgs.stdenv.mkDerivation {
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name = "zabbix-dummy-module-''${cfg.package.version}";
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src = cfg.package.src;
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buildInputs = [ cfg.package ];
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sourceRoot = "zabbix-''${cfg.package.version}/src/modules/dummy";
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installPhase = '''
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mkdir -p $out/lib
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cp dummy.so $out/lib/
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''';
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};
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}
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'';
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};
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database = {
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type = mkOption {
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type = types.enum [ "mysql" "pgsql" "sqlite" ];
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example = "mysql";
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default = "pgsql";
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description = "Database engine to use.";
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};
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host = mkOption {
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type = types.str;
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default = "localhost";
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description = "Database host address.";
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};
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port = mkOption {
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type = types.int;
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default = if cfg.database.type == "mysql" then mysql.port else pgsql.port;
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defaultText = literalExpression ''
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if config.${opt.database.type} == "mysql"
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then config.${options.services.mysql.port}
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else config.${options.services.postgresql.port}
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'';
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description = "Database host port.";
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};
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name = mkOption {
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type = types.str;
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default = if cfg.database.type == "sqlite" then "${stateDir}/zabbix.db" else "zabbix";
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defaultText = literalExpression "zabbix";
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description = "Database name.";
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};
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user = mkOption {
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type = types.str;
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default = "zabbix";
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description = "Database user.";
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};
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passwordFile = mkOption {
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type = types.nullOr types.path;
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default = null;
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example = "/run/keys/zabbix-dbpassword";
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description = ''
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A file containing the password corresponding to
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<option>database.user</option>.
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'';
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};
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socket = mkOption {
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type = types.nullOr types.path;
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default = null;
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example = "/run/postgresql";
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description = "Path to the unix socket file to use for authentication.";
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};
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createLocally = mkOption {
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type = types.bool;
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default = true;
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description = "Whether to create a local database automatically.";
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};
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};
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listen = {
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ip = mkOption {
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type = types.str;
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default = "0.0.0.0";
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description = ''
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List of comma delimited IP addresses that the trapper should listen on.
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Trapper will listen on all network interfaces if this parameter is missing.
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'';
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};
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port = mkOption {
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type = types.port;
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default = 10051;
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description = ''
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Listen port for trapper.
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'';
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};
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};
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openFirewall = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Open ports in the firewall for the Zabbix Proxy.
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'';
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};
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settings = mkOption {
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type = with types; attrsOf (oneOf [ int str (listOf str) ]);
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default = {};
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description = ''
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Zabbix Proxy configuration. Refer to
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<link xlink:href="https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_proxy"/>
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for details on supported values.
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'';
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example = {
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CacheSize = "1G";
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SSHKeyLocation = "/var/lib/zabbix/.ssh";
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StartPingers = 32;
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};
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};
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};
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};
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# implementation
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config = mkIf cfg.enable {
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assertions = [
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{ assertion = !config.services.zabbixServer.enable;
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message = "Please choose one of services.zabbixServer or services.zabbixProxy.";
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}
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{ assertion = cfg.database.createLocally -> cfg.database.user == user;
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message = "services.zabbixProxy.database.user must be set to ${user} if services.zabbixProxy.database.createLocally is set true";
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}
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{ assertion = cfg.database.createLocally -> cfg.database.passwordFile == null;
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message = "a password cannot be specified if services.zabbixProxy.database.createLocally is set to true";
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}
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];
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services.zabbixProxy.settings = mkMerge [
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{
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LogType = "console";
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ListenIP = cfg.listen.ip;
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ListenPort = cfg.listen.port;
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Server = cfg.server;
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# TODO: set to cfg.database.socket if database type is pgsql?
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DBHost = optionalString (cfg.database.createLocally != true) cfg.database.host;
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DBName = cfg.database.name;
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DBUser = cfg.database.user;
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SocketDir = runtimeDir;
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FpingLocation = "/run/wrappers/bin/fping";
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LoadModule = builtins.attrNames cfg.modules;
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}
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(mkIf (cfg.database.createLocally != true) { DBPort = cfg.database.port; })
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(mkIf (cfg.database.passwordFile != null) { Include = [ "${passwordFile}" ]; })
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(mkIf (mysqlLocal && cfg.database.socket != null) { DBSocket = cfg.database.socket; })
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(mkIf (cfg.modules != {}) { LoadModulePath = "${moduleEnv}/lib"; })
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];
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networking.firewall = mkIf cfg.openFirewall {
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allowedTCPPorts = [ cfg.listen.port ];
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};
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services.mysql = optionalAttrs mysqlLocal {
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enable = true;
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package = mkDefault pkgs.mariadb;
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};
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systemd.services.mysql.postStart = mkAfter (optionalString mysqlLocal ''
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( echo "CREATE DATABASE IF NOT EXISTS \`${cfg.database.name}\` CHARACTER SET utf8 COLLATE utf8_bin;"
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echo "CREATE USER IF NOT EXISTS '${cfg.database.user}'@'localhost' IDENTIFIED WITH ${if (getName config.services.mysql.package == getName pkgs.mariadb) then "unix_socket" else "auth_socket"};"
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echo "GRANT ALL PRIVILEGES ON \`${cfg.database.name}\`.* TO '${cfg.database.user}'@'localhost';"
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) | ${config.services.mysql.package}/bin/mysql -N
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'');
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services.postgresql = optionalAttrs pgsqlLocal {
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enable = true;
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ensureDatabases = [ cfg.database.name ];
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ensureUsers = [
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{ name = cfg.database.user;
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ensurePermissions = { "DATABASE ${cfg.database.name}" = "ALL PRIVILEGES"; };
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}
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];
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};
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users.users.${user} = {
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description = "Zabbix daemon user";
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uid = config.ids.uids.zabbix;
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inherit group;
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};
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users.groups.${group} = {
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gid = config.ids.gids.zabbix;
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};
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security.wrappers = {
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fping =
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{ setuid = true;
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owner = "root";
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group = "root";
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source = "${pkgs.fping}/bin/fping";
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};
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};
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systemd.services.zabbix-proxy = {
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description = "Zabbix Proxy";
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wantedBy = [ "multi-user.target" ];
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after = optional mysqlLocal "mysql.service" ++ optional pgsqlLocal "postgresql.service";
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path = [ "/run/wrappers" ] ++ cfg.extraPackages;
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preStart = optionalString pgsqlLocal ''
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if ! test -e "${stateDir}/db-created"; then
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cat ${cfg.package}/share/zabbix/database/postgresql/schema.sql | ${pgsql.package}/bin/psql ${cfg.database.name}
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touch "${stateDir}/db-created"
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fi
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'' + optionalString mysqlLocal ''
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if ! test -e "${stateDir}/db-created"; then
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cat ${cfg.package}/share/zabbix/database/mysql/schema.sql | ${mysql.package}/bin/mysql ${cfg.database.name}
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touch "${stateDir}/db-created"
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fi
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'' + optionalString (cfg.database.type == "sqlite") ''
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if ! test -e "${cfg.database.name}"; then
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${pkgs.sqlite}/bin/sqlite3 "${cfg.database.name}" < ${cfg.package}/share/zabbix/database/sqlite3/schema.sql
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fi
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'' + optionalString (cfg.database.passwordFile != null) ''
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# create a copy of the supplied password file in a format zabbix can consume
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touch ${passwordFile}
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chmod 0600 ${passwordFile}
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echo -n "DBPassword = " > ${passwordFile}
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cat ${cfg.database.passwordFile} >> ${passwordFile}
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'';
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serviceConfig = {
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ExecStart = "@${cfg.package}/sbin/zabbix_proxy zabbix_proxy -f --config ${configFile}";
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Restart = "always";
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RestartSec = 2;
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User = user;
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Group = group;
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RuntimeDirectory = "zabbix";
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StateDirectory = "zabbix";
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PrivateTmp = true;
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};
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};
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};
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}
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