Fixes issues with raising mysql file limit

Changes Include:
 - Adds spec testing
 - Only raise limits if nonha.  puppet-systemd will restart the mariadb
   service which breaks ha deployments.  Hence we only want to do this
   in noha.
 - Minor fix to hiera value refrenced not as parameter to mysql.pp

Partial-Bug: #1648181
Related-Bug: #1524809

Co-Authored By: Feng Pan <fpan@redhat.com>

Change-Id: Id063bf4b4ac229181b01f40965811cb8ac4230d5
Signed-off-by: Tim Rozet <trozet@redhat.com>
Signed-off-by: Feng Pan <fpan@redhat.com>

Puppetfile_extras

@@ -40,3 +40,7 @@ mod 'certmonger',
 mod 'ntp',
   :git => 'https://github.com/puppetlabs/puppetlabs-ntp',
   :ref => '4.2.x'
+
+mod 'systemd',
+  :git => 'https://github.com/camptocamp/puppet-systemd',
+  :ref => 'master'

manifests/profile/base/database/mysql.pp

@@ -62,6 +62,10 @@
 #   Should be an hash.
 #   Defaults to {}
 #
+# [*mysql_max_connections*]
+#   (Optional) Maximum number of connections to MySQL.
+#   Defaults to hiera('mysql_max_connections', undef)
+#
 # [*remove_default_accounts*]
 #   (Optional) Whether or not remove default MySQL accounts.
 #   Defaults to true
@@ -81,6 +85,7 @@ class tripleo::profile::base::database::mysql (
   $generate_service_certificates = hiera('generate_service_certificates', false),
   $manage_resources              = true,
   $mysql_server_options          = {},
+  $mysql_max_connections         = hiera('mysql_max_connections', undef),
   $remove_default_accounts       = true,
   $step                          = hiera('step'),
 ) {
@@ -126,7 +131,7 @@ class tripleo::profile::base::database::mysql (
     $mysql_server_default = {
       'mysqld' => {
         'bind-address'          => $bind_address,
-        'max_connections'       => hiera('mysql_max_connections'),
+        'max_connections'       => $mysql_max_connections,
         'open_files_limit'      => '-1',
         'innodb_file_per_table' => 'ON',
         'ssl'                   => $enable_internal_tls,
@@ -146,11 +151,11 @@ class tripleo::profile::base::database::mysql (
       remove_default_accounts => $remove_default_accounts,
     }
 
-    if $generate_dropin_file_limit {
+    if $generate_dropin_file_limit and $manage_resources {
       # Raise the mysql file limit
       ::systemd::service_limits { 'mariadb.service':
         limits => {
-          LimitNOFILE => 16384
+          'LimitNOFILE' => 16384
         }
       }
     }

spec/classes/tripleo_profile_base_database_mysql_spec.rb

@@ -0,0 +1,75 @@
+#
+# 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::database::mysql' do
+  let :params do
+    { :step                    => 2,
+      :mysql_max_connections   => 4096,
+    }
+  end
+  shared_examples_for 'tripleo::profile::base::database::mysql' do
+    before :each do
+      facts.merge!({ :step => params[:step] })
+    end
+
+    context 'with noha and raise mariadb limit' do
+      before do
+        params.merge!({
+          :generate_dropin_file_limit => true
+        })
+      end
+      it 'should create limit file' do
+        is_expected.to contain_systemd__service_limits('mariadb.service').with(
+          :limits => { "LimitNOFILE" => 16384 })
+      end
+    end
+
+    context 'with noha and do not raise mariadb limit' do
+      before do
+        params.merge!({
+          :generate_dropin_file_limit => false
+        })
+      end
+      it 'should not create limit file' do
+        is_expected.to_not contain_systemd__service_limits('mariadb.service')
+      end
+    end
+
+    context 'with ha and raise mariadb limit' do
+      before do
+        params.merge!({
+          :generate_dropin_file_limit => true,
+          :manage_resources => false,
+        })
+      end
+      it 'should not create limit file in ha' do
+        is_expected.to_not contain_systemd__service_limits('mariadb.service')
+      end
+    end
+  end
+
+  on_supported_os.each do |os, facts|
+    context "on #{os}" do
+      let(:facts) do
+        facts.merge({ :hostname => 'node.example.com' })
+      end
+
+      it_behaves_like 'tripleo::profile::base::database::mysql'
+    end
+  end
+end