Add support of shared staging location for glance-direct

In the case of an HA setup (ie with 3 controller nodes) if image
import method is 'glance-direct', it would require a shared
consistent staging location on the controller nodes otherwise it
might happen that the image is uploaded to one node and triggering
the import is executed on a different node - where the image does not
exist.

Hence when import method 'glance-direct' is needed, operators need to
enable it explicitly with enabling NFS across the controller nodes
to share the staging.

Change-Id: I9a5bff5e5d0c3e109b73d691cc9088904a0401ac
Closes-Bug: #1765439

docker/services/glance-api.yaml

@@ -202,16 +202,7 @@ outputs:
                   - /var/lib/kolla/config_files/glance_api.json:/var/lib/kolla/config_files/config.json
                   - /var/lib/config-data/puppet-generated/glance_api/:/var/lib/kolla/config_files/src:ro
                   - /etc/ceph:/var/lib/kolla/config_files/src-ceph:ro
-                  -
-                    if:
-                      - nfs_backend_enabled
-                      - /var/lib/glance:/var/lib/glance
-                      - ''
-                  -
-                    if:
-                      - netapp_nfs_backend_enabled
-                      - /var/lib/glance:/var/lib/glance
-                      - ''
+                  - /var/lib/glance:/var/lib/glance:slave
                 -
                   if:
                     - cinder_backend_enabled

environments/storage/glance-nfs.yaml

@@ -9,6 +9,10 @@
 #   Configure and include this environment to enable the use of an NFS
 #   share as the backend for Glance.
 parameter_defaults:
+  # List of enabled Image Import Methods. Valid values in the list are 'glance-direct' and 'web-download'
+  # Type: comma_delimited_list
+  GlanceEnabledImportMethods: web-download
+
   # When using GlanceBackend 'file', Netapp mount NFS share for image storage.
   # Type: boolean
   GlanceNetappNfsEnabled: False
@@ -21,6 +25,18 @@ parameter_defaults:
   # Type: string
   GlanceNfsShare: ''
 
+  # URI that specifies the staging location to use when importing images
+  # Type: string
+  GlanceNodeStagingUri: file:///var/lib/glance/staging
+
+  # NFS mount options for NFS image import staging
+  # Type: string
+  GlanceStagingNfsOptions: _netdev,bg,intr,context=system_u:object_r:glance_var_lib_t:s0
+
+  # NFS share to mount for image import staging
+  # Type: string
+  GlanceStagingNfsShare: ''
+
   # Netapp share to mount for image storage (when GlanceNetappNfsEnabled is true)
   # Type: string
   NetappShareLocation: ''

puppet/services/glance-api.yaml

@@ -137,6 +137,21 @@ parameters:
       List of enabled Image Import Methods. Valid values in the list are
       'glance-direct' and 'web-download'
     type: comma_delimited_list
+  GlanceStagingNfsShare:
+    default: ''
+    description: >
+      NFS share to mount for image import staging
+    type: string
+  GlanceNodeStagingUri:
+    default: 'file:///var/lib/glance/staging'
+    description: >
+      URI that specifies the staging location to use when importing images
+    type: string
+  GlanceStagingNfsOptions:
+    default: '_netdev,bg,intr,context=system_u:object_r:glance_var_lib_t:s0'
+    description: >
+      NFS mount options for NFS image import staging
+    type: string
   KeystoneRegion:
     type: string
     default: 'regionOne'
@@ -244,6 +259,7 @@ outputs:
             glance::api::os_region_name: {get_param: KeystoneRegion}
             glance::api::image_member_quota: {get_param: GlanceImageMemberQuota}
             glance::api::enabled_import_methods: {get_param: GlanceEnabledImportMethods}
+            glance::api::node_staging_uri: {get_param: GlanceNodeStagingUri}
             # NOTE: bind IP is found in hiera replacing the network name with the
             # local node IP for the given network; replacement examples
             # (eg. for internal_api):
@@ -356,6 +372,14 @@ outputs:
                 - NETAPP_SHARE: {get_param: NetappShareLocation}
                   NFS_OPTIONS: {get_param: GlanceNfsOptions}
           when: netapp_nfs_backend_enable
+        - name: Mount Node Staging Location
+          vars:
+            glance_node_staging_uri: {get_param: GlanceNodeStagingUri}
+            glance_staging_nfs_share: {get_param: GlanceStagingNfsShare}
+            glance_nfs_options: {get_param: GlanceStagingNfsOptions}
+          # Gleaning mount point by stripping "file://" prefix from staging uri
+          mount: name="{{glance_node_staging_uri[7:]}}" src="{{glance_staging_nfs_share}}" fstype=nfs opts="{{glance_nfs_options}}" state=mounted
+          when: glance_staging_nfs_share
 
       upgrade_tasks:
         - name: Check if glance_api is deployed

sample-env-generator/storage.yaml

@@ -28,6 +28,10 @@ environments:
           - GlanceNfsOptions
           - GlanceNetappNfsEnabled
           - NetappShareLocation
+          - GlanceEnabledImportMethods
+          - GlanceStagingNfsShare
+          - GlanceNodeStagingUri
+          - GlanceStagingNfsOptions
     sample_values:
       GlanceBackend: file
       GlanceNfsEnabled: True