Allow to configure sysctl values

This patch allows to customize sysctl values on all nodes, by defining
the values in Hiera directly.

Change-Id: Iab8b2f8559d6748f77630d68c48aebed90cf07ec

manifests/init.pp

@@ -75,6 +75,19 @@
 #       },
 #     }
 #
+# [*sysctl*]
+#   (optional) Set of sysctl values to set.
+#   Defaults {}
+#   Example:
+#     {
+#       'net.ipv4.ip_forward' => {
+#          'value' => '1',
+#       },
+#       'net.ipv6.conf.all.forwarding => {
+#          'value' => '1',
+#       },
+#     }
+#
 # [*manage_firewall*]
 #  (optional) Completely enable or disable firewall settings
 #  (false means disabled, and true means enabled)
@@ -110,6 +123,7 @@ class cloud(
   $selinux_booleans     = [],
   $selinux_modules      = [],
   $limits               = {},
+  $sysctl               = {},
   $manage_firewall      = false,
   $firewall_rules       = {},
   $purge_firewall_rules = false,
@@ -161,6 +175,10 @@ This node is under the control of Puppet ${::puppetversion}.
   include ::limits
   create_resources('limits::limits', $limits)
 
+  # sysctl values
+  include ::sysctl::base
+  create_resources('sysctl::value', $sysctl)
+
   # SELinux
   if $::osfamily == 'RedHat' {
     class {'cloud::selinux' :

spec/classes/cloud_init_spec.rb

@@ -64,6 +64,28 @@ describe 'cloud' do
 
     end
 
+    context 'with explicit sysctl values' do
+      before :each do
+        params.merge!( :sysctl => {
+                         'net.ipv4.ip_forward' => {
+                           'value' => '1',
+                          },
+                         'net.ipv6.conf.all.forwarding' => {
+                           'value' => '1',
+                         }
+                      })
+      end
+
+      it { is_expected.to contain_sysctl('net.ipv4.ip_forward').with(
+        :val => '1',
+     ) }
+      it { is_expected.to contain_sysctl('net.ipv6.conf.all.forwarding').with(
+        :val => '1',
+     ) }
+
+    end
+
+
     it {is_expected.to contain_file('/etc/motd').with(
       {:ensure => 'file'}.merge(file_defaults)
     )}