Upgrade task for Swift

Based on the Nova upgrade patch and recommendations from Swift PTL John
Dickinson at
https://swiftstack.com/blog/2013/12/20/upgrade-openstack-swift-no-downtime/

Notes:

As part of this upgrade I have chosen to *not* migrate any data from the
old style swift_data container. This is because it was never intended to
be used in production; this fact is made clear in the docs.

In regards to testing, as of this patch we do not yet have an upgrade
task for the common containers (rsyslog and kolla-toolbox), so
attempting to upgrade swift will result in it failing to find the
kolla-toolbox. This will be true of any other upgrade until upgrade for
common is added. It can be worked around by deploying another role such
as keystone which will drag in the common role and start up
kolla-toolbox, after which Swift can be successfully upgraded.

Change-Id: I138556932e9bddcd595d94a3dcb69603268880ff
Partially-Implements: blueprint upgrade-kolla
Implements: blueprint upgrade-swift

ansible/roles/swift/tasks/start.yml

@@ -43,18 +43,6 @@
       - "heka_socket:/var/lib/kolla/heka/"
   when: inventory_hostname not in groups['swift-proxy-server']
 
-- name: Starting swift-proxy-server container
-  kolla_docker:
-    action: "start_container"
-    common_options: "{{ docker_common_options }}"
-    image: "{{ swift_proxy_server_image_full }}"
-    name: "swift_proxy_server"
-    volumes:
-      - "{{ node_config_directory }}/swift/:/var/lib/kolla/swift/:ro"
-      - "{{ node_config_directory }}/swift-proxy-server/:{{ container_config_directory }}/:ro"
-      - "heka_socket:/var/lib/kolla/heka/"
-  when: inventory_hostname in groups['swift-proxy-server']
-
 - name: Starting swift-account-server container
   kolla_docker:
     action: "start_container"
@@ -223,3 +211,15 @@
       - "{{ swift_devices_mount_point }}:{{ swift_devices_mount_point }}"
       - "heka_socket:/var/lib/kolla/heka/"
   when: inventory_hostname in groups['swift-object-server']
+
+- name: Starting swift-proxy-server container
+  kolla_docker:
+    action: "start_container"
+    common_options: "{{ docker_common_options }}"
+    image: "{{ swift_proxy_server_image_full }}"
+    name: "swift_proxy_server"
+    volumes:
+      - "{{ node_config_directory }}/swift/:/var/lib/kolla/swift/:ro"
+      - "{{ node_config_directory }}/swift-proxy-server/:{{ container_config_directory }}/:ro"
+      - "heka_socket:/var/lib/kolla/heka/"
+  when: inventory_hostname in groups['swift-proxy-server']

ansible/roles/swift/tasks/stop_and_start.yml

+---
+# NOTE(pbourke): because the images that are used to start Swift containers
+# were refactored for Mitaka, we need to completely remove the existing
+# containers or we get a conflict when attempting to start the new ones.
+- name: "Cleaning out old Swift containers"
+  kolla_docker:
+    name: "{{ item }}"
+    # TODO(pbourke): Swift recommend using a SIGHUP to gracefully stop the
+    # services. Update once kolla_docker supports this.
+    action: remove_container
+  with_items:
+    - "swift_rsyncd"
+    - "swift_account_server"
+    - "swift_account_auditor"
+    - "swift_account_replicator"
+    - "swift_account_reaper"
+    - "swift_container_server"
+    - "swift_container_auditor"
+    - "swift_container_replicator"
+    - "swift_container_updater"
+    - "swift_object_server"
+    - "swift_object_auditor"
+    - "swift_object_replicator"
+    - "swift_object_updater"
+    - "swift_object_expirer"
+    - "swift_proxy_server"
+
+- include: start.yml

ansible/roles/swift/tasks/upgrade.yml

 ---
+- include: config.yml
+
+- include: stop_and_start.yml
+  serial: "30%"