diff --git a/manifests/backend/defaults/file.pp b/manifests/backend/defaults/file.pp
new file mode 100644
index 00000000..fbb41795
--- /dev/null
+++ b/manifests/backend/defaults/file.pp
@@ -0,0 +1,52 @@
+# == Class: glance::backend::defaults::file
+#
+# Configure common defaults for all file backends
+#
+# === Parameters:
+#
+# [*filesystem_store_datadir*]
+#   (optional) Directory where dist images are stored.
+#   Defaults to $facts['os_service_default'].
+#
+# [*filesystem_store_metadata_file*]
+#   (optional) Filesystem store metadata file.
+#   Defaults to $facts['os_service_default'].
+#
+# [*filesystem_store_file_perm*]
+#   (optional) File access permissions for the image files.
+#   Defaults to $facts['os_service_default'].
+#
+# [*filesystem_store_chunk_size*]
+#   (optional) Chunk size, in bytes.
+#   Defaults to $facts['os_service_default'].
+#
+# [*filesystem_thin_provisioning*]
+#   (optional) Boolean describing if thin provisioning is enabled or not
+#   Defaults to $facts['os_service_default']
+#
+class glance::backend::defaults::file(
+  $filesystem_store_datadir       = $facts['os_service_default'],
+  $filesystem_store_metadata_file = $facts['os_service_default'],
+  $filesystem_store_file_perm     = $facts['os_service_default'],
+  $filesystem_store_chunk_size    = $facts['os_service_default'],
+  $filesystem_thin_provisioning   = $facts['os_service_default'],
+) {
+
+  include glance::deps
+
+  glance_api_config {
+    'backend_defaults/filesystem_store_datadir':       value => $filesystem_store_datadir;
+    'backend_defaults/filesystem_store_metadata_file': value => $filesystem_store_metadata_file;
+    'backend_defaults/filesystem_store_file_perm':     value => $filesystem_store_file_perm;
+    'backend_defaults/filesystem_store_chunk_size':    value => $filesystem_store_chunk_size;
+    'backend_defaults/filesystem_thin_provisioning':   value => $filesystem_thin_provisioning;
+  }
+
+  glance_cache_config {
+    'backend_defaults/filesystem_store_datadir':       value => $filesystem_store_datadir;
+    'backend_defaults/filesystem_store_metadata_file': value => $filesystem_store_metadata_file;
+    'backend_defaults/filesystem_store_file_perm':     value => $filesystem_store_file_perm;
+    'backend_defaults/filesystem_store_chunk_size':    value => $filesystem_store_chunk_size;
+    'backend_defaults/filesystem_thin_provisioning':   value => $filesystem_thin_provisioning;
+  }
+}
diff --git a/manifests/backend/defaults/rbd.pp b/manifests/backend/defaults/rbd.pp
new file mode 100644
index 00000000..2b4b1051
--- /dev/null
+++ b/manifests/backend/defaults/rbd.pp
@@ -0,0 +1,55 @@
+# == Class: glance::backend::defaults::rbd
+#
+# Configure common defaults for all rbd backends
+#
+# === Parameters:
+#
+# [*rbd_store_user*]
+#   Optional. Default: $facts['os_service_default'].
+#
+# [*rbd_store_pool*]
+#   Optional. Default: $facts['os_service_default'].
+#
+# [*rbd_store_ceph_conf*]
+#   Optional. Default: $facts['os_service_default'].
+#
+# [*rbd_store_chunk_size*]
+#   Optional. Default: $facts['os_service_default'].
+#
+# [*rbd_thin_provisioning*]
+#   Optional. Boolean describing if thin provisioning is enabled or not
+#   Defaults to $facts['os_service_default']
+#
+# [*rados_connect_timeout*]
+#   Optional. Timeout value (in seconds) used when connecting to ceph cluster.
+#   Default: $facts['os_service_default'].
+#
+class glance::backend::defaults::rbd(
+  $rbd_store_user        = $facts['os_service_default'],
+  $rbd_store_ceph_conf   = $facts['os_service_default'],
+  $rbd_store_pool        = $facts['os_service_default'],
+  $rbd_store_chunk_size  = $facts['os_service_default'],
+  $rbd_thin_provisioning = $facts['os_service_default'],
+  $rados_connect_timeout = $facts['os_service_default'],
+) {
+
+  include glance::deps
+
+  glance_api_config {
+    'backend_defaults/rbd_store_user':        value => $rbd_store_user;
+    'backend_defaults/rbd_store_ceph_conf':   value => $rbd_store_ceph_conf;
+    'backend_defaults/rbd_store_pool':        value => $rbd_store_pool;
+    'backend_defaults/rbd_store_chunk_size':  value => $rbd_store_chunk_size;
+    'backend_defaults/rbd_thin_provisioning': value => $rbd_thin_provisioning;
+    'backend_defaults/rados_connect_timeout': value => $rados_connect_timeout;
+  }
+
+  glance_cache_config {
+    'backend_defaults/rbd_store_user':        value => $rbd_store_user;
+    'backend_defaults/rbd_store_ceph_conf':   value => $rbd_store_ceph_conf;
+    'backend_defaults/rbd_store_pool':        value => $rbd_store_pool;
+    'backend_defaults/rbd_store_chunk_size':  value => $rbd_store_chunk_size;
+    'backend_defaults/rbd_thin_provisioning': value => $rbd_thin_provisioning;
+    'backend_defaults/rados_connect_timeout': value => $rados_connect_timeout;
+  }
+}
diff --git a/manifests/backend/defaults/s3.pp b/manifests/backend/defaults/s3.pp
new file mode 100644
index 00000000..ecaf9a5e
--- /dev/null
+++ b/manifests/backend/defaults/s3.pp
@@ -0,0 +1,82 @@
+# == Class: glance::backend::defaults::s3
+#
+# Configure common defaults for all rbd backends
+#
+# === Parameters:
+#
+# [*s3_store_host*]
+#   (required) The host where the S3 server is listening.
+#   Defaults to $facts['os_service_default'].
+#
+# [*s3_store_access_key*]
+#   (required) The S3 query token access key.
+#   Defaults to $facts['os_service_default'].
+#
+# [*s3_store_secret_key*]
+#   (required) The S3 query token secret key.
+#   Defaults to $facts['os_service_default'].
+#
+# [*s3_store_bucket*]
+#   (required) The S3 bucket to be used to store the Glance data.
+#   Defaults to $facts['os_service_default'].
+#
+# [*s3_store_create_bucket_on_put*]
+#   (optional) Determine whether S3 should create a new bucket.
+#   Defaults to $facts['os_service_default'].
+#
+# [*s3_store_bucket_url_format*]
+#   (optional) The S3 calling format used to determine the object.
+#   Defaults to $facts['os_service_default'].
+#
+# [*s3_store_large_object_size*]
+#   (optional) What size, in MB, should S3 start chunking image files and do
+#   a multipart upload in S3.
+#   Defaults to $facts['os_service_default'].
+#
+# [*s3_store_large_object_chunk_size*]
+#   (optional) What multipart upload part size, in MB, should S3 use when
+#   uploading parts.
+#   Defaults to $facts['os_service_default'].
+#
+# [*s3_store_thread_pools*]
+#   (optional) The number of thread pools to perform a multipart upload in S3.
+#   Defaults to $facts['os_service_default'].
+#
+class glance::backend::defaults::s3(
+  $s3_store_host                    = $facts['os_service_default'],
+  $s3_store_access_key              = $facts['os_service_default'],
+  $s3_store_secret_key              = $facts['os_service_default'],
+  $s3_store_bucket                  = $facts['os_service_default'],
+  $s3_store_create_bucket_on_put    = $facts['os_service_default'],
+  $s3_store_bucket_url_format       = $facts['os_service_default'],
+  $s3_store_large_object_size       = $facts['os_service_default'],
+  $s3_store_large_object_chunk_size = $facts['os_service_default'],
+  $s3_store_thread_pools            = $facts['os_service_default'],
+) {
+
+  include glance::deps
+
+  glance_api_config {
+    'backend_defaults/s3_store_host':                    value => $s3_store_host;
+    'backend_defaults/s3_store_access_key':              value => $s3_store_access_key, secret => true;
+    'backend_defaults/s3_store_secret_key':              value => $s3_store_secret_key, secret => true;
+    'backend_defaults/s3_store_bucket':                  value => $s3_store_bucket;
+    'backend_defaults/s3_store_create_bucket_on_put':    value => $s3_store_create_bucket_on_put;
+    'backend_defaults/s3_store_bucket_url_format':       value => $s3_store_bucket_url_format;
+    'backend_defaults/s3_store_large_object_size':       value => $s3_store_large_object_size;
+    'backend_defaults/s3_store_large_object_chunk_size': value => $s3_store_large_object_chunk_size;
+    'backend_defaults/s3_store_thread_pools':            value => $s3_store_thread_pools;
+  }
+
+  glance_cache_config {
+    'backend_defaults/s3_store_host':                    value => $s3_store_host;
+    'backend_defaults/s3_store_access_key':              value => $s3_store_access_key, secret => true;
+    'backend_defaults/s3_store_secret_key':              value => $s3_store_secret_key, secret => true;
+    'backend_defaults/s3_store_bucket':                  value => $s3_store_bucket;
+    'backend_defaults/s3_store_create_bucket_on_put':    value => $s3_store_create_bucket_on_put;
+    'backend_defaults/s3_store_bucket_url_format':       value => $s3_store_bucket_url_format;
+    'backend_defaults/s3_store_large_object_size':       value => $s3_store_large_object_size;
+    'backend_defaults/s3_store_large_object_chunk_size': value => $s3_store_large_object_chunk_size;
+    'backend_defaults/s3_store_thread_pools':            value => $s3_store_thread_pools;
+  }
+}
diff --git a/manifests/backend/defaults/swift.pp b/manifests/backend/defaults/swift.pp
new file mode 100644
index 00000000..fe897742
--- /dev/null
+++ b/manifests/backend/defaults/swift.pp
@@ -0,0 +1,92 @@
+# == Class: glance::backend::defaults::swift
+#
+# Configure common defaults for all rbd backends
+#
+# === Parameters:
+#
+# [*swift_store_container*]
+#   (Optional) Name of single container to store images/name prefix for
+#   multiple containers.
+#   Defaults to $facts['os_service_default'].
+#
+# [*swift_store_large_object_size*]
+#   (Optional) The size threshold, in MB, after which Glance will start
+#   segmenting image data.
+#   Defaults to $facts['os_service_default'].
+#
+# [*swift_store_large_object_chunk_size*]
+#   (Optional) The maximum size, in MB, of the segments when image data is
+#   segmented.
+#   Defaults to $facts['os_service_default'].
+#
+# [*swift_store_create_container_on_put*]
+#   (Optional) Create container, if it doesn't already exist, when uploading
+#   image.
+#   Defaults to $facts['os_service_default'].
+#
+# [*swift_store_endpoint_type*]
+#   (Optional) Endpoint type of Swift service.
+#   Defaults to $facts['os_service_default'].
+#
+# [*swift_store_service_type*]
+#   (Optional) Type of the swift service to use.
+#   Defaults to $facts['os_service_default'].
+#
+# [*swift_store_region*]
+#   (Optional) The region of Swift endpoint to use by Glance.
+#   Defaults to $facts['os_service_default'].
+#
+# [*swift_buffer_on_upload*]
+#   (Optional) Buffer image segments before upload to Swift.
+#   Defaults to $facts['os_service_default'].
+#
+# [*swift_upload_buffer_dir*]
+#   (Optional) Directory to buffer image segments before upload to Swift.
+#   Defaults to $facts['os_service_default'].
+#
+# [*swift_store_retry_get_count*]
+#   (Optional) The number of times a Swift download will be retried before
+#   the request fails.
+#   Defaults to $facts['os_service_default'].
+#
+class glance::backend::defaults::swift(
+  $swift_store_container               = $facts['os_service_default'],
+  $swift_store_large_object_size       = $facts['os_service_default'],
+  $swift_store_large_object_chunk_size = $facts['os_service_default'],
+  $swift_store_create_container_on_put = $facts['os_service_default'],
+  $swift_store_endpoint_type           = $facts['os_service_default'],
+  $swift_store_service_type            = $facts['os_service_default'],
+  $swift_store_region                  = $facts['os_service_default'],
+  $swift_buffer_on_upload              = $facts['os_service_default'],
+  $swift_upload_buffer_dir             = $facts['os_service_default'],
+  $swift_store_retry_get_count         = $facts['os_service_default'],
+) {
+
+  include glance::deps
+  include swift::client
+
+  glance_api_config {
+    'backend_defaults/swift_store_region':                  value => $swift_store_region;
+    'backend_defaults/swift_store_container':               value => $swift_store_container;
+    'backend_defaults/swift_store_create_container_on_put': value => $swift_store_create_container_on_put;
+    'backend_defaults/swift_store_large_object_size':       value => $swift_store_large_object_size;
+    'backend_defaults/swift_store_large_object_chunk_size': value => $swift_store_large_object_chunk_size;
+    'backend_defaults/swift_store_endpoint_type':           value => $swift_store_endpoint_type;
+    'backend_defaults/swift_store_service_type':            value => $swift_store_service_type;
+    'backend_defaults/swift_buffer_on_upload':              value => $swift_buffer_on_upload;
+    'backend_defaults/swift_upload_buffer_dir':             value => $swift_upload_buffer_dir;
+    'backend_defaults/swift_store_retry_get_count':         value => $swift_store_retry_get_count;
+  }
+  glance_cache_config {
+    'backend_defaults/swift_store_region':                  value => $swift_store_region;
+    'backend_defaults/swift_store_container':               value => $swift_store_container;
+    'backend_defaults/swift_store_create_container_on_put': value => $swift_store_create_container_on_put;
+    'backend_defaults/swift_store_large_object_size':       value => $swift_store_large_object_size;
+    'backend_defaults/swift_store_large_object_chunk_size': value => $swift_store_large_object_chunk_size;
+    'backend_defaults/swift_store_endpoint_type':           value => $swift_store_endpoint_type;
+    'backend_defaults/swift_store_service_type':            value => $swift_store_service_type;
+    'backend_defaults/swift_buffer_on_upload':              value => $swift_buffer_on_upload;
+    'backend_defaults/swift_upload_buffer_dir':             value => $swift_upload_buffer_dir;
+    'backend_defaults/swift_store_retry_get_count':         value => $swift_store_retry_get_count;
+  }
+}
diff --git a/manifests/backend/multistore/rbd.pp b/manifests/backend/multistore/rbd.pp
index 56346b54..50b145b2 100644
--- a/manifests/backend/multistore/rbd.pp
+++ b/manifests/backend/multistore/rbd.pp
@@ -15,8 +15,7 @@
 #
 # == Define: glance::backend::multistore::rbd
 #
-# configures the storage backend for glance
-# as a rbd instance
+# configures the storage backend for glance as a rbd instance
 #
 # === Parameters:
 #
diff --git a/manifests/backend/multistore/swift.pp b/manifests/backend/multistore/swift.pp
index 62780383..5cd835d5 100644
--- a/manifests/backend/multistore/swift.pp
+++ b/manifests/backend/multistore/swift.pp
@@ -13,10 +13,9 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 #
-# == Define: glance::backend::swift
+# == Define: glance::backend::multistore::swift
 #
-# configures the storage backend for glance
-# as a swift instance
+# configures the storage backend for glance as a swift instance
 #
 # === Parameters:
 #
diff --git a/releasenotes/notes/backend-defaults-462ee04b120ff23c.yaml b/releasenotes/notes/backend-defaults-462ee04b120ff23c.yaml
new file mode 100644
index 00000000..276a5d51
--- /dev/null
+++ b/releasenotes/notes/backend-defaults-462ee04b120ff23c.yaml
@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Added support for managing options in the new ``[backend_defaults]``
+    section.
diff --git a/spec/classes/glance_backend_defaults_file_spec.rb b/spec/classes/glance_backend_defaults_file_spec.rb
new file mode 100644
index 00000000..b764fc8d
--- /dev/null
+++ b/spec/classes/glance_backend_defaults_file_spec.rb
@@ -0,0 +1,72 @@
+require 'spec_helper'
+
+describe 'glance::backend::defaults::file' do
+
+  shared_examples_for 'glance::backend::defaults::file' do
+    it 'configures glance-api.conf' do
+      is_expected.to contain_glance_api_config('backend_defaults/filesystem_store_datadir').with_value('<SERVICE DEFAULT>')
+      is_expected.to contain_glance_api_config('backend_defaults/filesystem_store_metadata_file').with_value('<SERVICE DEFAULT>')
+      is_expected.to contain_glance_api_config('backend_defaults/filesystem_store_file_perm').with_value('<SERVICE DEFAULT>')
+      is_expected.to contain_glance_api_config('backend_defaults/filesystem_store_chunk_size').with_value('<SERVICE DEFAULT>')
+      is_expected.to contain_glance_api_config('backend_defaults/filesystem_thin_provisioning').with_value('<SERVICE DEFAULT>')
+    end
+
+    it 'configures glance-cache.conf' do
+      is_expected.to contain_glance_cache_config('backend_defaults/filesystem_store_datadir').with_value('<SERVICE DEFAULT>')
+      is_expected.to contain_glance_cache_config('backend_defaults/filesystem_store_metadata_file').with_value('<SERVICE DEFAULT>')
+      is_expected.to contain_glance_cache_config('backend_defaults/filesystem_store_file_perm').with_value('<SERVICE DEFAULT>')
+      is_expected.to contain_glance_cache_config('backend_defaults/filesystem_store_chunk_size').with_value('<SERVICE DEFAULT>')
+      is_expected.to contain_glance_cache_config('backend_defaults/filesystem_thin_provisioning').with_value('<SERVICE DEFAULT>')
+    end
+
+    describe 'when overriding datadir' do
+      let :params do
+        {
+          :filesystem_store_datadir       => '/var/lib/glance/images',
+          :filesystem_store_metadata_file => '/var/lib/glance/metadata.json',
+          :filesystem_store_file_perm     => 0,
+          :filesystem_store_chunk_size    => 65536,
+          :filesystem_thin_provisioning   => true,
+        }
+      end
+
+      it 'configures glance-api.conf' do
+        is_expected.to contain_glance_api_config('backend_defaults/filesystem_store_datadir')\
+          .with_value('/var/lib/glance/images')
+        is_expected.to contain_glance_api_config('backend_defaults/filesystem_store_metadata_file')\
+          .with_value('/var/lib/glance/metadata.json')
+        is_expected.to contain_glance_api_config('backend_defaults/filesystem_store_file_perm')\
+          .with_value(0)
+        is_expected.to contain_glance_api_config('backend_defaults/filesystem_store_chunk_size')\
+          .with_value(65536)
+        is_expected.to contain_glance_api_config('backend_defaults/filesystem_thin_provisioning')\
+          .with_value(true)
+      end
+
+      it 'configures glance-cache.conf' do
+        is_expected.to contain_glance_cache_config('backend_defaults/filesystem_store_datadir')\
+          .with_value('/var/lib/glance/images')
+        is_expected.to contain_glance_cache_config('backend_defaults/filesystem_store_metadata_file')\
+          .with_value('/var/lib/glance/metadata.json')
+        is_expected.to contain_glance_cache_config('backend_defaults/filesystem_store_file_perm')\
+          .with_value(0)
+        is_expected.to contain_glance_cache_config('backend_defaults/filesystem_store_chunk_size')\
+          .with_value(65536)
+        is_expected.to contain_glance_cache_config('backend_defaults/filesystem_thin_provisioning')\
+          .with_value(true)
+      end
+    end
+  end
+
+  on_supported_os({
+    :supported_os   => OSDefaults.get_supported_os
+  }).each do |os,facts|
+    context "on #{os}" do
+      let (:facts) do
+        facts.merge!(OSDefaults.get_facts())
+      end
+
+      it_behaves_like 'glance::backend::defaults::file'
+    end
+  end
+end
diff --git a/spec/classes/glance_backend_defaults_rbd_spec.rb b/spec/classes/glance_backend_defaults_rbd_spec.rb
new file mode 100644
index 00000000..ee4fb778
--- /dev/null
+++ b/spec/classes/glance_backend_defaults_rbd_spec.rb
@@ -0,0 +1,60 @@
+require 'spec_helper'
+
+describe 'glance::backend::defaults::rbd' do
+  shared_examples 'glance::backend::defaults::rbd' do
+    context 'with default params' do
+      it 'configures glance-api.conf' do
+        should contain_glance_api_config('backend_defaults/rbd_store_user').with_value('<SERVICE DEFAULT>')
+        should contain_glance_api_config('backend_defaults/rbd_store_pool').with_value('<SERVICE DEFAULT>')
+        should contain_glance_api_config('backend_defaults/rbd_store_ceph_conf').with_value('<SERVICE DEFAULT>')
+        should contain_glance_api_config('backend_defaults/rbd_store_chunk_size').with_value('<SERVICE DEFAULT>')
+        should contain_glance_api_config('backend_defaults/rbd_thin_provisioning').with_value('<SERVICE DEFAULT>')
+        should contain_glance_api_config('backend_defaults/rados_connect_timeout').with_value('<SERVICE DEFAULT>')
+      end
+      it 'configures glance-cache.conf' do
+        should contain_glance_cache_config('backend_defaults/rbd_store_user').with_value('<SERVICE DEFAULT>')
+        should contain_glance_cache_config('backend_defaults/rbd_store_pool').with_value('<SERVICE DEFAULT>')
+        should contain_glance_cache_config('backend_defaults/rbd_store_ceph_conf').with_value('<SERVICE DEFAULT>')
+        should contain_glance_cache_config('backend_defaults/rbd_store_chunk_size').with_value('<SERVICE DEFAULT>')
+        should contain_glance_cache_config('backend_defaults/rbd_thin_provisioning').with_value('<SERVICE DEFAULT>')
+        should contain_glance_cache_config('backend_defaults/rados_connect_timeout').with_value('<SERVICE DEFAULT>')
+      end
+    end
+
+    context 'when passing params' do
+      let :params do
+        {
+          :rbd_store_user        => 'user',
+          :rbd_store_chunk_size  => '2',
+          :rbd_thin_provisioning => 'true',
+          :rados_connect_timeout => '30',
+        }
+      end
+
+      it 'configures glance-api.conf' do
+        should contain_glance_api_config('backend_defaults/rbd_store_user').with_value('user')
+        should contain_glance_api_config('backend_defaults/rbd_store_chunk_size').with_value('2')
+        should contain_glance_api_config('backend_defaults/rbd_thin_provisioning').with_value('true')
+        should contain_glance_api_config('backend_defaults/rados_connect_timeout').with_value('30')
+      end
+      it 'configures glance-cache.conf' do
+        should contain_glance_cache_config('backend_defaults/rbd_store_user').with_value('user')
+        should contain_glance_cache_config('backend_defaults/rbd_store_chunk_size').with_value('2')
+        should contain_glance_cache_config('backend_defaults/rbd_thin_provisioning').with_value('true')
+        should contain_glance_cache_config('backend_defaults/rados_connect_timeout').with_value('30')
+      end
+    end
+  end
+
+  on_supported_os({
+    :supported_os => OSDefaults.get_supported_os
+  }).each do |os,facts|
+    context "on #{os}" do
+      let (:facts) do
+        facts.merge!(OSDefaults.get_facts())
+      end
+
+      it_behaves_like 'glance::backend::defaults::rbd'
+    end
+  end
+end
diff --git a/spec/classes/glance_backend_defaults_s3_spec.rb b/spec/classes/glance_backend_defaults_s3_spec.rb
new file mode 100644
index 00000000..2620d5eb
--- /dev/null
+++ b/spec/classes/glance_backend_defaults_s3_spec.rb
@@ -0,0 +1,83 @@
+require 'spec_helper'
+
+describe 'glance::backend::defaults::s3' do
+  shared_examples_for 'glance::backend::defaults::s3' do
+    context 'with defaults' do
+      it 'configures glance-api.conf' do
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_host').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_access_key').with_value('<SERVICE DEFAULT>').with_secret(true)
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_secret_key').with_value('<SERVICE DEFAULT>').with_secret(true)
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_bucket').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_create_bucket_on_put').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_bucket_url_format').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_large_object_size').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_large_object_chunk_size').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_thread_pools').with_value('<SERVICE DEFAULT>')
+      end
+
+      it 'configures glance-cache.conf' do
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_host').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_access_key').with_value('<SERVICE DEFAULT>').with_secret(true)
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_secret_key').with_value('<SERVICE DEFAULT>').with_secret(true)
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_bucket').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_create_bucket_on_put').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_bucket_url_format').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_large_object_size').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_large_object_chunk_size').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_thread_pools').with_value('<SERVICE DEFAULT>')
+      end
+    end
+
+    context 'when overriding datadir' do
+      let :params do
+        {
+          :s3_store_host                    => 'host',
+          :s3_store_access_key              => 'access',
+          :s3_store_secret_key              => 'secret',
+          :s3_store_bucket                  => 'bucket',
+          :s3_store_create_bucket_on_put    => false,
+          :s3_store_bucket_url_format       => 'auto',
+          :s3_store_large_object_size       => 100,
+          :s3_store_large_object_chunk_size => 10,
+          :s3_store_thread_pools            => 11,
+        }
+      end
+
+      it 'configures glance-api.conf' do
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_host').with_value('host')
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_access_key').with_value('access').with_secret(true)
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_secret_key').with_value('secret').with_secret(true)
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_bucket').with_value('bucket')
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_create_bucket_on_put').with_value(false)
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_bucket_url_format').with_value('auto')
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_large_object_size').with_value(100)
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_large_object_chunk_size').with_value(10)
+        is_expected.to contain_glance_api_config('backend_defaults/s3_store_thread_pools').with_value(11)
+      end
+
+      it 'configures glance-cache.conf' do
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_host').with_value('host')
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_access_key').with_value('access').with_secret(true)
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_secret_key').with_value('secret').with_secret(true)
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_bucket').with_value('bucket')
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_create_bucket_on_put').with_value(false)
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_bucket_url_format').with_value('auto')
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_large_object_size').with_value(100)
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_large_object_chunk_size').with_value(10)
+        is_expected.to contain_glance_cache_config('backend_defaults/s3_store_thread_pools').with_value(11)
+      end
+    end
+  end
+
+  on_supported_os({
+    :supported_os   => OSDefaults.get_supported_os
+  }).each do |os,facts|
+    context "on #{os}" do
+      let (:facts) do
+        facts.merge!(OSDefaults.get_facts())
+      end
+
+      it_behaves_like 'glance::backend::defaults::s3'
+    end
+  end
+end
diff --git a/spec/classes/glance_backend_defaults_swift_spec.rb b/spec/classes/glance_backend_defaults_swift_spec.rb
new file mode 100644
index 00000000..4a1b33ec
--- /dev/null
+++ b/spec/classes/glance_backend_defaults_swift_spec.rb
@@ -0,0 +1,88 @@
+require 'spec_helper'
+
+describe 'glance::backend::defaults::swift' do
+
+  shared_examples_for 'glance::backend::defaults::swift' do
+    describe 'when default parameters' do
+
+      it 'configures glance-api.conf' do
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_large_object_size').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_large_object_chunk_size').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_container').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_create_container_on_put').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_endpoint_type').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_service_type').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_region').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_buffer_on_upload').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_upload_buffer_dir').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_retry_get_count').with_value('<SERVICE DEFAULT>')
+      end
+      it 'configures glance-cache.conf' do
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_large_object_size').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_large_object_chunk_size').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_container').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_create_container_on_put').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_endpoint_type').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_service_type').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_region').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_buffer_on_upload').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_upload_buffer_dir').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_retry_get_count').with_value('<SERVICE DEFAULT>')
+      end
+    end
+
+    describe 'when overriding parameters' do
+      let :params do
+        {
+          :swift_store_large_object_size       => '100',
+          :swift_store_large_object_chunk_size => '50',
+          :swift_store_container               => 'swift',
+          :swift_store_create_container_on_put => true,
+          :swift_store_endpoint_type           => 'publicURL',
+          :swift_store_service_type            => 'object-store',
+          :swift_store_region                  => 'RegionTwo',
+          :swift_buffer_on_upload              => true,
+          :swift_upload_buffer_dir             => '/var/glance/swift',
+          :swift_store_retry_get_count         => 3,
+        }
+      end
+
+      it 'configures glance-api.conf' do
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_container').with_value('swift')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_create_container_on_put').with_value(true)
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_large_object_size').with_value('100')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_large_object_chunk_size').with_value('50')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_endpoint_type').with_value('publicURL')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_service_type').with_value('object-store')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_region').with_value('RegionTwo')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_buffer_on_upload').with_value(true)
+        is_expected.to contain_glance_api_config('backend_defaults/swift_upload_buffer_dir').with_value('/var/glance/swift')
+        is_expected.to contain_glance_api_config('backend_defaults/swift_store_retry_get_count').with_value(3)
+      end
+      it 'configures glance-cache.conf' do
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_container').with_value('swift')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_create_container_on_put').with_value(true)
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_large_object_size').with_value('100')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_large_object_chunk_size').with_value('50')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_endpoint_type').with_value('publicURL')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_service_type').with_value('object-store')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_region').with_value('RegionTwo')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_buffer_on_upload').with_value(true)
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_upload_buffer_dir').with_value('/var/glance/swift')
+        is_expected.to contain_glance_cache_config('backend_defaults/swift_store_retry_get_count').with_value(3)
+      end
+    end
+  end
+
+  on_supported_os({
+    :supported_os   => OSDefaults.get_supported_os
+  }).each do |os,facts|
+    context "on #{os}" do
+      let (:facts) do
+        facts.merge!(OSDefaults.get_facts())
+      end
+
+      it_behaves_like 'glance::backend::defaults::swift'
+    end
+  end
+end