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ReStructuredText
135 lines
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ReStructuredText
..
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Copyright 2010 OpenStack Foundation
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All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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under the License.
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Image Statuses
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==============
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Images in Glance can be in one the following statuses:
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* ``queued``
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The image identifier has been reserved for an image in the Glance
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registry. No image data has been uploaded to Glance and the image
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size was not explicitly set to zero on creation.
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* ``saving``
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Denotes that an image's raw data is currently being uploaded to Glance.
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When an image is registered with a call to `POST /images` and there
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is an `x-image-meta-location` header present, that image will never be in
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the `saving` status (as the image data is already available in some other
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location).
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* ``active``
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Denotes an image that is fully available in Glance. This occurs when
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the image data is uploaded, or the image size is explicitly set to
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zero on creation.
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* ``deactivated``
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Denotes that access to image data is not allowed to any non-admin user.
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Prohibiting downloads of an image also prohibits operations like image
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export and image cloning that may require image data.
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* ``killed``
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Denotes that an error occurred during the uploading of an image's data,
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and that the image is not readable.
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* ``deleted``
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Glance has retained the information about the image, but it is no longer
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available to use. An image in this state will be removed automatically
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at a later date.
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* ``pending_delete``
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This is similar to `deleted`, however, Glance has not yet removed the
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image data. An image in this state is not recoverable.
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.. figure:: ./images/image_status_transition.png
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:figwidth: 100%
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:align: center
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:alt: The states consist of:
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"queued", "saving", "active", "pending_delete", "deactivated",
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"killed", and "deleted".
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The transitions consist of:
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An initial transition to the "queued" state called "create image".
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A transition from the "queued" state to the "active" state
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called "add location".
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A transition from the "queued" state to the "saving" state
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called "upload".
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A transition from the "queued" state to the "deleted" state
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called "delete".
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A transition from the "saving" state to the "active" state
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called "upload succeeded".
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A transition from the "saving" state to the "deleted" state
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called "delete".
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A transition from the "saving" state to the "killed" state
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called "[v1] upload fail".
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A transition from the "saving" state to the "queued" state
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called "[v2] upload fail".
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A transition from the "active" state to the "deleted" state
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called "delete".
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A transition from the "active" state to the "pending_delete" state
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called "delayed delete".
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A transition from the "active" state to the "deactivated" state
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called "deactivate".
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A transition from the "killed" state to the "deleted" state
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called "deleted".
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A transition from the "pending_delete" state to the "deleted" state
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called "after scrub time".
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A transition from the "deactivated" state to the "deleted" state
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called "delete".
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A transition from the "deactivated" state to the "active" state
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called "reactivate".
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There are no transitions out of the "deleted" state.
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This is a representation of how the image move from one status to the next.
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* Add location from zero to more than one.
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.. _task-statuses:
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Task Statuses
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=============
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Tasks in Glance can be in one the following statuses:
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* ``pending``
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The task identifier has been reserved for a task in the Glance.
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No processing has begun on it yet.
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* ``processing``
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The task has been picked up by the underlying executor and is being run
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using the backend Glance execution logic for that task type.
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* ``success``
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Denotes that the task has had a successful run within Glance. The ``result``
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field of the task shows more details about the outcome.
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* ``failure``
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Denotes that an error occurred during the execution of the task and it
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cannot continue processing. The ``message`` field of the task shows what the
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error was.
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