openstack-ansible/doc/source/install-guide/configure-glance.rst

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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. 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:

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.

1. Change the default store to use Object Storage (swift), the underlying architecture of Cloud Files:

   glance_default_store: swift

2. Set the appropriate authentication URL and version:

   glance_swift_store_auth_version: 2
   glance_swift_store_auth_address: https://127.0.0.1/v2.0

3. Set the swift account credentials (see Special Considerations at the bottom of this page):

   # Replace this capitalized variables with actual data.
   glance_swift_store_user: GLANCE_SWIFT_TENANT:GLANCE_SWIFT_USER
   glance_swift_store_key: SWIFT_PASSWORD_OR_KEY

4. Change the glance_swift_store_endpoint_type from the default internalURL settings to publicURL if needed.

   glance_swift_store_endpoint_type: publicURL

5. Define the store name:

   glance_swift_store_container: STORE_NAME

   Replace STORE_NAME with the container name in swift to be used for storing images. If the container doesn't exist, it will be automatically created.

6. Define the store region:

   glance_swift_store_region: STORE_REGION

   Replace STORE_REGION if needed.

7. (Optional) Set the paste deploy flavor:

   glance_flavor: GLANCE_FLAVOR

   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 which exceeds the available disk space. If necessary, you can disable caching. For example, to use Identity without caching, replace GLANCE_FLAVOR with keystone:

   glance_flavor: keystone

   Or, to disable both authentication and caching, set GLANCE_FLAVOR to no value:

   glance_flavor:

   This option is set by default to use authentication and cache management in the playbooks/roles/os_glance/defaults/main.yml file. To override the default behavior, set glance_flavor to a different value in /etc/openstack_deploy/user_variables.yml.

   The possible values for GLANCE_FLAVOR are:

   • (Nothing)
   • caching
   • cachemanagement
   • keystone
   • keystone+caching
   • keystone+cachemanagement (default)
   • trusted-auth
   • trusted-auth+cachemanagement

Special Considerations

If the swift password or key contains a dollar sign ($), it must be escaped with an additional dollar sign ($$). For example, a password of super$ecure would need to be entered as super$$ecure. This is needed due to the way oslo.config formats strings.

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