add icinga2 rule for outgoing traffic

REFERENCE.md

@@ -48,6 +48,7 @@ and Manager Daemons (MGR).
 * [`nftables::rules::out::hkp`](#nftables--rules--out--hkp): allow outgoing hkp connections to gpg keyservers
 * [`nftables::rules::out::http`](#nftables--rules--out--http): manage out http
 * [`nftables::rules::out::https`](#nftables--rules--out--https): manage out https
+* [`nftables::rules::out::icinga2`](#nftables--rules--out--icinga2): allow outgoing icinga2
 * [`nftables::rules::out::icmp`](#nftables--rules--out--icmp): control outbound icmp packages
 * [`nftables::rules::out::igmp`](#nftables--rules--out--igmp): allow outgoing IGMP messages
 * [`nftables::rules::out::imap`](#nftables--rules--out--imap): allow outgoing imap
@@ -1013,6 +1014,24 @@ manage out http
 
 manage out https
 
+### <a name="nftables--rules--out--icinga2"></a>`nftables::rules::out::icinga2`
+
+allow outgoing icinga2
+
+#### Parameters
+
+The following parameters are available in the `nftables::rules::out::icinga2` class:
+
+* [`ports`](#-nftables--rules--out--icinga2--ports)
+
+##### <a name="-nftables--rules--out--icinga2--ports"></a>`ports`
+
+Data type: `Array[Stdlib::Port,1]`
+
+icinga2 ports
+
+Default value: `[5665]`
+
 ### <a name="nftables--rules--out--icmp"></a>`nftables::rules::out::icmp`
 
 control outbound icmp packages

manifests/rules/out/icinga2.pp

@@ -0,0 +1,10 @@
+# allow outgoing icinga2
+# @param ports icinga2 ports
+class nftables::rules::out::icinga2 (
+  Array[Stdlib::Port,1] $ports = [5665],
+) {
+  nftables::rule {
+    'default_out-icinga2':
+      content => "tcp dport {${join($ports,', ')}} accept",
+  }
+}

spec/classes/rules/out/icinga2_spec.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'nftables::rules::out::icinga2' do
+  on_supported_os.each do |os, os_facts|
+    context "on #{os}" do
+      let(:facts) { os_facts }
+
+      context 'default options' do
+        it { is_expected.to compile }
+        it { is_expected.to contain_nftables__rule('default_out-icinga2').with_content('tcp dport {5665} accept') }
+      end
+
+      context 'with ports set' do
+        let(:params) do
+          {
+            ports: [55, 60],
+          }
+        end
+
+        it { is_expected.to compile }
+        it { is_expected.to contain_nftables__rule('default_out-icinga2').with_content('tcp dport {55, 60} accept') }
+      end
+    end
+  end
+end