Glance: bring Swift backend support

This patch adds the Swift backend support in Glance service.

* Add the backend in cloud::image::api without new parameter.
* Add new unit tests to validate the backend support with a new context.
* Document the new backend in README.

Change-Id: I685978161e51baa47c897fe0824401615e8c4387

README.md

@@ -41,6 +41,11 @@ Cinder has multi-backend support:
 * iSCSI
 * EMC VNX direct
 * NFS
+Glance supports different backends:
+* RBD (default)
+* file
+* NFS (mount a NFS share by using file backend)
+* Swift
 Neutron supports:
 * ML2 plugin with OVS agent (GRE + VXLAN supported)
 * Cisco plugin with N1KV agent (non-ML2)

manifests/image/api.pp

@@ -69,7 +69,7 @@
 #
 # [*backend*]
 #   (optionnal) Backend to use to store images
-#   Can be 'rbd', 'file' or 'nfs'.
+#   Can be 'rbd', 'file', 'nfs' or 'swift'
 #   Defaults to 'rbd' to maintain backward compatibility
 #
 # [*filesystem_store_datadir*]
@@ -200,6 +200,13 @@ class cloud::image::api(
     class { 'glance::backend::file':
       filesystem_store_datadir => $filesystem_store_datadir
     }
+  } elsif ($backend == 'swift') {
+    class { 'glance::backend::swift':
+      swift_store_user                    => 'services:glance',
+      swift_store_key                     => $ks_glance_password,
+      swift_store_auth_address            => "${ks_keystone_internal_proto}://${ks_keystone_internal_host}:35357/v2.0/",
+      swift_store_create_container_on_put => true,
+    }
   } elsif ($backend == 'nfs') {
     # There is no NFS backend in Glance.
     # We mount the NFS share in filesystem_store_datadir to fake the

spec/classes/cloud_image_api_spec.rb

@@ -133,6 +133,22 @@ describe 'cloud::image::api' do
       end
     end
 
+    context 'with Swift backend' do
+      before :each do
+        params.merge!(:backend => 'swift')
+      end
+
+      it 'configure Glance with Glance backend' do
+        is_expected.not_to contain_class('glance::backend::file')
+        is_expected.not_to contain_class('glance::backend::rbd')
+        is_expected.to contain_glance_api_config('DEFAULT/default_store').with('value' => 'swift')
+        is_expected.to contain_glance_api_config('DEFAULT/swift_store_user').with('value' => 'services:glance')
+        is_expected.to contain_glance_api_config('DEFAULT/swift_store_key').with('value' => 'secrete')
+        is_expected.to contain_glance_api_config('DEFAULT/swift_store_auth_address').with('value' => 'https://10.0.0.1:35357/v2.0/')
+        is_expected.to contain_glance_api_config('DEFAULT/swift_store_create_container_on_put').with('value' => true)
+      end
+    end
+
     context 'with missing parameter when using Glance NFS backend' do
       before :each do
         params.merge!(:backend    => 'nfs',