Ignore failures when loading nf_conntrack_proto_sctp kernel module

Ignore failures if nf_conntrack_proto_sctp module failed to load.
Since RHEL 7.4, nf_conntrack_proto_sctp module is compiled into the
kernel instead of as a module as the sctp support.
TripleO will still try to load the module to support RHEL 7.3, but
in the future will remove the module management and rely on the kernel
provided in newer versions of RHEL.

Co-Authored-By: Or Idgar <oidgar@redhat.com>
Co-Authored-By: Alex Schultz <aschultz@redhat.com>
Co-Authored-By: Emilien Macchi <emilien@redhat.com>

Change-Id: I8f1c841a7c0f3b1247aba2b959b6dfbe43d8cd79
Closes-Bug: 1695885

manifests/profile/base/kernel.pp

@@ -17,14 +17,32 @@
 #
 # Load and configure Kernel modules.
 #
-class tripleo::profile::base::kernel {
+# === Parameters
+#
+# [*module_list*]
+#   (Optional) List of kernel modules to load.
+#   Defaults to hiera('kernel_modules')
+#
+# [*sysctl_settings*]
+#   (Optional) List of sysctl settings to load.
+#   Defaults to hiera('sysctl_settings')
+#
+class tripleo::profile::base::kernel (
+  $module_list     = hiera('kernel_modules', undef),
+  $sysctl_settings = hiera('sysctl_settings', undef),
+) {
 
-  if hiera('kernel_modules', undef) {
-    create_resources(kmod::load, hiera('kernel_modules'), { })
+  if $module_list {
+    create_resources(kmod::load, $module_list, { })
   }
-  if hiera('sysctl_settings', undef) {
-    create_resources(sysctl::value, hiera('sysctl_settings'), { })
+  if $sysctl_settings {
+    create_resources(sysctl::value, $sysctl_settings, { })
   }
   Exec <| tag == 'kmod::load' |> -> Sysctl <| |>
 
+  # RHEL 7.4+ workaround where this functionality is built into the
+  # kernel instead of being built as a module.
+  # That way, we can support both 7.3 and 7.4 RHEL versions.
+  # https://bugzilla.redhat.com/show_bug.cgi?id=1387537
+  Exec <| title == 'modprobe nf_conntrack_proto_sctp' |> { returns => [0,1] }
 }

releasenotes/notes/nf_conntrack_proto_sctp-a64300a3fc7b4e55.yaml

@@ -0,0 +1,9 @@
+---
+issues:
+  - |
+    Ignore failures if nf_conntrack_proto_sctp module failed to load.
+    Since RHEL 7.4, nf_conntrack_proto_sctp module is compiled into the
+    kernel instead of as a module as the sctp support.
+    TripleO will still try to load the module to support RHEL 7.3, but
+    in the future will remove the module management and rely on the kernel
+    provided in newer versions of RHEL.

spec/classes/tripleo_profile_base_kernel_spec.rb

@@ -0,0 +1,59 @@
+#
+# Copyright (C) 2017 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+
+require 'spec_helper'
+
+describe 'tripleo::profile::base::kernel' do
+
+    shared_examples_for 'tripleo::profile::base::kernel' do
+        context 'with kernel modules' do
+           let :params do
+               {
+                   :module_list => {
+                     'nf_conntrack' => {},
+                   }
+               }
+           end
+
+            it 'should load kernel module' do
+                is_expected.to contain_kmod__load('nf_conntrack')
+            end
+        end
+        context 'with sysctl settings' do
+           let :params do
+               {
+                   :sysctl_settings => {
+                     'net.ipv4.tcp_keepalive_intvl' => { 'value' => '1'},
+                   }
+               }
+           end
+
+            it 'should load kernel module' do
+                is_expected.to contain_sysctl__value('net.ipv4.tcp_keepalive_intvl')
+            end
+        end
+    end
+
+    on_supported_os.each do |os, facts|
+        context "on #{os}" do
+            let(:facts) {
+                facts
+            }
+
+        it_behaves_like 'tripleo::profile::base::kernel'
+        end
+    end
+end