openstack/openstack-ansible
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Merge "Docs: Multiple store backends in Glance"

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doc/source/install-guide/configure-glance.rst
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`Home <index.html>`_ OpenStack-Ansible Installation Guide
Configuring the Image service
Configuring the Image Service
-----------------------------
In an all-in-one deployment with a single infrastructure node, the Image
service uses the local file system on the target host to store images.
Service uses the local file system on the target host to store images.
When deploying production clouds we recommend backing Glance with a
swift backend or some form or another of shared storage.
Configuring default and additional stores
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
OpenStack-Ansible provides two configurations for controlling where the Image
Service stores files: the default store and additional stores. As mentioned
in the previous section, the Image Service stores images in file-based storage
by default. Two additional stores, http and cinder, are also enabled by
default.
Deployers can choose alternative default stores, as shown in the swift example
in the next section, and deployers can choose alternative additional stores.
For example, a deployer that uses Ceph may configure the following Ansible
variables:
.. code-block:: yaml
glance_default_store = rbd
glance_additional_stores:
- swift
- http
- cinder
The configuration above will configure the Image Service to use rbd (Ceph) by
default, but the swift, http and cinder stores will also be enabled in the
Image Service configuration files.
Storing images in Cloud Files
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The following procedure describes how to modify the
``/etc/openstack_deploy/user_variables.yml`` file to enable Cloud Files
usage.
@ -66,10 +95,10 @@ usage.
glance_flavor: GLANCE_FLAVOR
By default, the Image service uses caching and authenticates with the
By default, the Image Service uses caching and authenticates with the
Identity service. The default maximum size of the image cache is 10
GB. The default Image service container size is 12 GB. In some
configurations, the Image service might attempt to cache an image
GB. The default Image Service container size is 12 GB. In some
configurations, the Image Service might attempt to cache an image
which exceeds the available disk space. If necessary, you can disable
caching. For example, to use Identity without caching, replace
``GLANCE_FLAVOR`` with ``keystone``: