iSCSI backend for Cinder volumes

As part of multi-backends, add iSCSI cinder backend.

* Add iscsi new backend.
* Allow to run iSCSI in multi-backend configurations via Hiera.
* Unit tests to validate both iSCSI & multi-backends.

manifests/volume/backend/iscsi.pp

@@ -0,0 +1,46 @@
+#
+# Copyright (C) 2014 eNovance SAS <licensing@enovance.com>
+#
+# 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.
+#
+# Configure iSCSI backend for Cinder
+#
+#
+# === Parameters
+#
+# [*iscsi_ip_address*]
+#   (required) IP address of iSCSI target.
+#
+# [*volume_group*]
+#   (optional) Cinder volume group name.
+#   Defaults to 'cinder-volumes'.
+#
+
+define cloud::volume::backend::iscsi (
+  $iscsi_ip_address,
+  $volume_group        = 'cinder-volumes',
+  $volume_backend_name = $name,
+) {
+
+
+  cinder::backend::iscsi { $name:
+    iscsi_ip_address => $iscsi_ip_address,
+    volume_group     => $volume_group,
+  }
+
+  @cinder::type { $volume_backend_name:
+    set_key   => 'volume_backend_name',
+    set_value => $volume_backend_name,
+    notify    => Service['cinder-volume']
+  }
+}

manifests/volume/storage.pp

@@ -83,8 +83,16 @@ class cloud::volume::storage(
       $netapp_backends = { }
     }
 
+    if has_key($cinder_backends, 'iscsi') {
+      $iscsi_backends = $cinder_backends['iscsi']
+      create_resources('cloud::volume::backend::iscsi', $iscsi_backends)
+    }
+    else {
+      $iscsi_backends = { }
+    }
+
     class { 'cinder::backends':
-      enabled_backends => keys(merge($rbd_backends, $netapp_backends))
+      enabled_backends => keys(merge($rbd_backends, $netapp_backends, $iscsi_backends))
     }
 
     # Manage Volume types.

spec/classes/cloud_volume_storage_spec.rb

@@ -55,6 +55,12 @@ describe 'cloud::volume::storage' do
               'netapp_login'           => 'joe',
               'netapp_password'        => 'secret'
             }
+          },
+          'iscsi' => {
+            'fast' => {
+              'iscsi_ip_address' => '10.0.0.1',
+              'volume_group'     => 'fast-vol'
+            }
           }
         },
         :ks_keystone_internal_proto => 'http',
@@ -132,6 +138,19 @@ describe 'cloud::volume::storage' do
       end
     end
 
+    context 'with iSCSI backend' do
+      it 'configures iSCSI volume driver' do
+        should contain_cinder_config('fast/volume_backend_name').with_value('fast')
+        should contain_cinder_config('fast/iscsi_ip_address').with_value('10.0.0.1')
+        should contain_cinder_config('fast/volume_group').with_value('fast-vol')
+        should contain_cinder__type('fast').with(
+          :set_key   => 'volume_backend_name',
+          :set_value => 'fast',
+          :notify    => 'Service[cinder-volume]'
+        )
+      end
+    end
+
     context 'with two RBD backends' do
       before :each do
         params.merge!(
@@ -185,7 +204,7 @@ describe 'cloud::volume::storage' do
     context 'with all backends enabled' do
       it 'configure all cinder backends' do
         should contain_class('cinder::backends').with(
-          :enabled_backends => ['lowcost', 'premium']
+          :enabled_backends => ['lowcost', 'premium', 'fast']
         )
       end
     end