Add swift as gnocchi storage option

- Uses swift if swift is enabled.
 - Uses ceph if ceph is enabled.
 - Defaults to file if swift and ceph are enabled.
   Explicitly set to swift or ceph when both are enabled.
 - Include swift client detail in storage section of gnocchi conf

Change-Id: I78df9a2fbe546038e1d6df350d8db0fd9b6f6d49

ansible/group_vars/all.yml

@@ -658,8 +658,9 @@ panko_database_type: "mysql"
 #################
 # Gnocchi options
 #################
-# Valid options are [file, ceph]
-gnocchi_backend_storage: "{{ 'ceph' if enable_ceph|bool else 'file' }}"
+# Valid options are [ file, ceph, swift ]
+# Defaults to file if ceph and swift are enabled; explicitly set to either if required.
+gnocchi_backend_storage: "{% if enable_ceph | bool and not enable_swift | bool %}ceph{% elif enable_swift | bool and not enable_ceph | bool %}swift{% else %}file{% endif %}"
 
 # Valid options are [redis, '']
 gnocchi_incoming_storage: "{{ 'redis' if enable_redis | bool else '' }}"

ansible/roles/gnocchi/defaults/main.yml

@@ -59,6 +59,13 @@ ceph_client_gnocchi_keyring_caps:
     allow rwx pool={{ ceph_gnocchi_pool_name }}-cache
 
 
+####################
+# Swift
+####################
+swift_keystone_user: "swift"
+swift_admin_tenant_name: "admin"
+
+
 ####################
 # Database
 ####################

ansible/roles/gnocchi/templates/gnocchi.conf.j2

@@ -76,6 +76,13 @@ ceph_pool = {{ gnocchi_pool_name }}
 ceph_username = gnocchi
 ceph_keyring = /etc/ceph/ceph.client.gnocchi.keyring
 ceph_conffile = /etc/ceph/ceph.conf
+{% elif gnocchi_backend_storage == 'swift' %}
+driver = swift
+swift_authurl = {{ internal_protocol }}://{{ kolla_internal_fqdn }}:{{ keystone_public_port }}/v3
+swift_auth_version = 3
+swift_user = service:{{ swift_keystone_user }}
+swift_key = {{ swift_keystone_password }}
+swift_project_name = {{ swift_admin_tenant_name }}
 {% endif %}
 
 {% if enable_grafana | bool %}

releasenotes/notes/gnochhi_swift_storage-5d05dab0e20eb43d.yaml

@@ -0,0 +1,9 @@
+---
+upgrade:
+  - |
+    Added swift as gnocchi storage option.
+    Here is the list of storage options for gnocchi-
+    a) Uses swift if swift is enabled.
+    b) Uses ceph if ceph is enabled.
+    c) Defaults to file if swift and ceph are enabled.
+    User has to explicitly set to swift or ceph if both enabled.