Add Ceph/RBD support to playbooks

Currently the playbooks do not allow Ceph to be configured as a backend
for Cinder, Glance or Nova. This commit adds a new role called
ceph_client to do the required configuration of the hosts and updates
the service roles to include the required configuration file changes.
This commit requires that a Ceph cluster already exists and does not
make any changes to that cluster.

ceph_client role, run on the OpenStack service hosts
  - configures the Ceph apt repo
  - installs any required Ceph dependencies
  - copies the ceph.conf file and appropriate keyring file to /etc/ceph
  - creates the necessary libvirt secrets

os_glance role
glance-api.conf will set the following variables for Ceph:
  - [DEFAULT]/show_image_direct_url
  - [glance_store]/stores
  - [glance_store]/rbd_store_pool
  - [glance_store]/rbd_store_user
  - [glance_store]/rbd_store_ceph_conf
  - [glance_store]/rbd_store_chunk_size

os_nova role
nova.conf will set the following variables for Ceph:
  - [libvirt]/rbd_user
  - [libvirt]/rbd_secret_uuid
  - [libvirt]/images_type
  - [libvirt]/images_rbd_pool
  - [libvirt]/images_rbd_ceph_conf
  - [libvirt]/inject_password
  - [libvirt]/inject_key
  - [libvirt]/inject_partition
  - [libvirt]/live_migration_flag

os_cinder is not updated because ceph is defined as a backend and that
is generated from a dictionary of the config, for an example backend
config, see etc/openstack_deploy/openstack_user_config.yml.example

pw-token-gen.py is updated so that variables ending in uuid are assigned
a UUID.

DocImpact
Implements: blueprint ceph-block-devices
Closes-Bug: #1455238
Change-Id: Ie484ce0bbb93adc53c30be32f291aa5058b20028

defaults/main.yml

@@ -32,12 +32,13 @@ glance_system_shell: /bin/false
 glance_system_comment: glance system user
 glance_system_user_home: "/var/lib/{{ glance_system_user_name }}"
 
-glance_flavor: "keystone+cachemanagement"
 glance_registry_host: "{{ internal_lb_vip_address }}"
 glance_ceilometer_notification_driver: messagingv2
 glance_notification_driver: noop
 glance_rpc_backend: glance.openstack.common.rpc.impl_kombu
 glance_default_store: file
+glance_flavor: "{% if glance_default_store == 'rbd' %}keystone{% else %}keystone+cachemanagement{% endif %}"
+glance_show_image_direct_url: "{{ glance_default_store == 'rbd' }}"
 
 
 ## API options
@@ -133,6 +134,12 @@ glance_policy_dirs: policy.d
 #  "add_image": ""
 #  "delete_image": ""
 
+## Ceph rbd Options
+glance_ceph_client: glance
+glance_rbd_store_pool: images
+glance_rbd_store_user: '{{ glance_ceph_client }}'
+glance_rbd_store_chunk_size: 8
+
 # Common apt packages
 glance_apt_packages:
   - rpcbind

templates/glance-api.conf.j2

@@ -48,6 +48,9 @@ scrub_time = 43200
 scrubber_datadir = {{ glance_system_user_home }}/scrubber/
 image_cache_dir = {{ glance_system_user_home }}/cache/
 
+# defaults to true if RBD is used as default store
+show_image_direct_url = {{ glance_show_image_direct_url }}
+
 [task]
 task_executor = {{ glance_task_executor }}
 
@@ -104,6 +107,12 @@ swift_store_large_object_size = {{ glance_swift_store_large_object_size }}
 swift_store_large_object_chunk_size = {{ glance_swift_store_large_object_chunk_size }}
 swift_store_retry_get_count = 5
 swift_store_endpoint_type = {{ glance_swift_store_endpoint_type }}
+{% elif glance_default_store == "rbd" %}
+stores = glance.store.rbd.Store,glance.store.http.Store,glance.store.cinder.Store
+rbd_store_pool = {{ glance_rbd_store_pool }}
+rbd_store_user = {{ glance_rbd_store_user }}
+rbd_store_ceph_conf = /etc/ceph/ceph.conf
+rbd_store_chunk_size = {{ glance_rbd_store_chunk_size }}
 {% endif %}
 
 [profiler]