Chapter 16. Configuring the image import method and shared staging area

Use a custom environment file to configure the import parameters. These parameters override the default values that are present in the core heat template collection. The example environment content contains parameters for the interoperable image import.

parameter_defaults:
  # Configure NFS backend
  GlanceBackend: file
  GlanceNfsEnabled: true
  GlanceNfsShare: 192.168.122.1:/export/glance

  # Enable glance-direct import method
  GlanceEnabledImportMethods: glance-direct,web-download

  # Configure NFS staging area (required for glance-direct import method)
  GlanceStagingNfsShare: 192.168.122.1:/export/glance-staging

The GlanceBackend, GlanceNfsEnabled, and GlanceNfsShare parameters are defined in the Storage Configuration section in the Advanced Overcloud Customization Guide.

Use two new parameters for interoperable image import to define the import method and a shared NFS staging area.

For more information about using environment files, see the Including Environment Files in Overcloud Creation section in the Advanced Overcloud Customization Guide.

You can limit the sources of web-import image downloads by adding URI blocklists and allowlists to the optional glance-image-import.conf file.

You can allow or block image source URIs at three levels:

If you specify both allowlist and blocklist at any level, the allowlist is honored and the blocklist is ignored.

The Image service (glance) applies the following decision logic to validate image source URIs:

If you allow a scheme, either by adding it to an allowlist or by not adding it to a blocklist, any URI that uses the default port for that scheme by not including a port in the URI is allowed. If it does include a port in the URI, the URI is validated according to the default decision logic.

For example, the default port for FTP is 21. Because ftp is an allowlisted scheme, this URL is allowed: ftp://example.org/some/resource But because 21 is not in the port allowlist, this URL to the same resource is rejected: ftp://example.org:21/some/resource

allowed_schemes = [http,https,ftp]
disallowed_schemes = []
allowed_hosts = []
disallowed_hosts = []
allowed_ports = [80,443]
disallowed_ports = []

The glance-image-import.conf file is an optional file that contains the following default options:

If you use the defaults, end users can access URIs by using only the http or https scheme. The only ports that users can specify are 80 and 443. Users do not have to specify a port, but if they do, it must be either 80 or 443.

You can find the glance-image-import.conf file in the etc/ subdirectory of the Image service source code tree. Ensure that you are looking in the correct branch for your release of Red Hat OpenStack Platform.

End users can upload images to the Image service and use these images to launch VMs. These user-provided (non-admin) images must be launched on a specific set of compute nodes. The assignment of an instance to a compute node is controlled by image metadata properties.

The Image Property Injection plugin injects metadata properties to images during import. Specify the properties by editing the [image_import_opts] and [inject_metadata_properties] sections of the glance-image-import.conf file.

To enable the Image Property Injection plugin, add the following line to the [image_import_opts] section:

[image_import_opts]
image_import_plugins = [inject_image_metadata]

To limit the metadata injection to images provided by a certain set of users, set the ignore_user_roles parameter. For example, use the following configuration to inject one value for property1 and two values for property2 into images downloaded by any non-admin user.

[DEFAULT]
[image_conversion]
[image_import_opts]
image_import_plugins = [inject_image_metadata]
[import_filtering_opts]
[inject_metadata_properties]
ignore_user_roles = admin
inject = PROPERTY1:value,PROPERTY2:value;another value

The parameter ignore_user_roles is a comma-separated list of the Identity service (keystone) roles that the plugin ignores. This means that if the user that makes the image import call has any of these roles, the plugin does not inject any properties into the image.

The parameter inject is a comma-separated list of properties and values that are injected into the image record for the imported image. Each property and value must be quoted and separated by a colon (‘:’).

You can find the glance-image-import.conf file in the etc/ subdirectory of the Image service source code tree. Ensure that you are looking in the correct branch for your release of Red Hat OpenStack Platform.