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Change-Id: I6525fd74d3d38400605aa2af8be80d0a701c438f
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Andreas Jaeger 2013-12-26 18:07:20 +01:00
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@ -7,17 +7,17 @@
<?dbhtml stop-chunking?>
<para>OpenStack Image Service offers retrieval, storage, and
metadata assignment for your images that you want to run in
your OpenStack cloud. The project is code-named Glance. </para>
your OpenStack cloud. The project is code-named Glance.</para>
<para>OpenStack Image service enables users to store and retrieve
images through a simple Web Service (ReST: Representational
State Transfer) interface. </para>
State Transfer) interface.</para>
<para>For more details on the OpenStack Image service,
please refer to <link xlink:href="http://docs.openstack.org/developer/glance/"
>docs.openstack.org/developer/glance/</link>
</para>
<para>We welcome feedback, comments, and bug reports at <link
xlink:href="http://bugs.launchpad.net/glance"
>bugs.launchpad.net/glance</link>. </para>
>bugs.launchpad.net/glance</link>.</para>
<section xml:id="glance-api-intended-audience">
<title>Intended Audience</title>
<para>This guide is intended to assist software developers who
@ -29,7 +29,7 @@
here, you should first have a general understanding of the
OpenStack Image Service and have access to an installation
of OpenStack Image Service. You should also be familiar
with: </para>
with:</para>
<itemizedlist spacing="compact">
<listitem>
<para>ReSTful web services</para>

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@ -6,25 +6,25 @@
<info>
<title>The Glance REST API</title>
</info>
<para> Glance has a RESTful API that exposes both metadata about
registered virtual machine images and the image data itself. </para>
<para> A host that runs the <literal>bin/glance-api</literal>
service is said to be a <emphasis>Glance API Server</emphasis>. </para>
<para> Assume there is a Glance API server running at the URL
<literal>http://glance.example.com</literal>. </para>
<para> Let's walk through how a user might request information from
this server. </para>
<para>Glance has a RESTful API that exposes both metadata about
registered virtual machine images and the image data itself.</para>
<para>A host that runs the <literal>bin/glance-api</literal>
service is said to be a <emphasis>Glance API Server</emphasis>.</para>
<para>Assume there is a Glance API server running at the URL
<literal>http://glance.example.com</literal>.</para>
<para>Let's walk through how a user might request information from
this server.</para>
<section xml:id="requesting-a-list-of-public-vm-images">
<info>
<title>Requesting a List of Public VM Images</title>
</info>
<para> We want to see a list of available virtual machine images
that the Glance server knows about. </para>
<para> We issue a <literal>GET</literal> request to
<para>We want to see a list of available virtual machine images
that the Glance server knows about.</para>
<para>We issue a <literal>GET</literal> request to
<literal>http://glance.example.com/images/</literal> to
retrieve this list of available <emphasis>public</emphasis>
images. The data is returned as a JSON-encoded mapping in the
following format: </para>
following format:</para>
<literallayout class="monospaced">
{'images': [
{'status: 'active',
@ -43,13 +43,13 @@ All images returned from the above `GET` request are <emphasis role="bold">publi
<title>Requesting Detailed Metadata on Public VM Images</title>
</info>
<para> We want to see more detailed information on available
virtual machine images that the Glance server knows about. </para>
<para> We issue a <literal>GET</literal> request to
<para>We want to see more detailed information on available
virtual machine images that the Glance server knows about.</para>
<para>We issue a <literal>GET</literal> request to
<literal>http://glance.example.com/images/detail</literal> to
retrieve this list of available <emphasis>public</emphasis>
images. The data is returned as a JSON-encoded mapping in the
following format: </para>
following format:</para>
<literallayout class="monospaced">
{'images': [
{'name': 'Ubuntu 10.04 Plain 5GB',
@ -96,54 +96,54 @@ indicate the owner of the image
/images/detail</literal></title>
</info>
<para> Both the <literal>GET /images</literal> and <literal>GET
<para>Both the <literal>GET /images</literal> and <literal>GET
/images/detail</literal> requests take query parameters that
serve to filter the returned list of images. The following list
details these query parameters. </para>
details these query parameters.</para>
<itemizedlist>
<listitem>
<para>
<literal>name=NAME</literal>
</para>
<para> Filters images having a <literal>name</literal>
attribute matching <literal>NAME</literal>. </para>
<para>Filters images having a <literal>name</literal>
attribute matching <literal>NAME</literal>.</para>
</listitem>
<listitem>
<para>
<literal>container_format=FORMAT</literal>
</para>
<para> Filters images having a
<para>Filters images having a
<literal>container_format</literal> attribute matching
<literal>FORMAT</literal>
</para>
<para> For more information, see :doc:`About Disk and
<para>For more information, see :doc:`About Disk and
Container Formats &lt;formats&gt;` </para>
</listitem>
<listitem>
<para>
<literal>disk_format=FORMAT</literal>
</para>
<para> Filters images having a <literal>disk_format</literal>
<para>Filters images having a <literal>disk_format</literal>
attribute matching <literal>FORMAT</literal>
</para>
<para> For more information, see :doc:`About Disk and
<para>For more information, see :doc:`About Disk and
Container Formats &lt;formats&gt;` </para>
</listitem>
<listitem>
<para>
<literal>status=STATUS</literal>
</para>
<para> Filters images having a <literal>status</literal>
<para>Filters images having a <literal>status</literal>
attribute matching <literal>STATUS</literal>
</para>
<para> For more information, see :doc:`About Image Statuses
<para>For more information, see :doc:`About Image Statuses
&lt;statuses&gt;` </para>
</listitem>
<listitem>
<para>
<literal>size_min=BYTES</literal>
</para>
<para> Filters images having a <literal>size</literal>
<para>Filters images having a <literal>size</literal>
attribute greater than or equal to <literal>BYTES</literal>
</para>
</listitem>
@ -151,33 +151,33 @@ indicate the owner of the image
<para>
<literal>size_max=BYTES</literal>
</para>
<para> Filters images having a <literal>size</literal>
<para>Filters images having a <literal>size</literal>
attribute less than or equal to <literal>BYTES</literal>
</para>
</listitem>
</itemizedlist>
<para> These two resources also accept sort parameters: </para>
<para>These two resources also accept sort parameters:</para>
<itemizedlist>
<listitem>
<para>
<literal>sort_key=KEY</literal>
</para>
<para> Results will be ordered by the specified image
<para>Results will be ordered by the specified image
attribute <literal>KEY</literal>. Accepted values include
<literal>id</literal>, <literal>name</literal>,
<literal>status</literal>, <literal>disk_format</literal>,
<literal>container_format</literal>,
<literal>size</literal>, <literal>created_at</literal>
(default) and <literal>updated_at</literal>. </para>
(default) and <literal>updated_at</literal>.</para>
</listitem>
<listitem>
<para>
<literal>sort_dir=DIR</literal>
</para>
<para> Results will be sorted in the direction
<para>Results will be sorted in the direction
<literal>DIR</literal>. Accepted values are
<literal>asc</literal> for ascending or
<literal>desc</literal> (default) for descending. </para>
<literal>desc</literal> (default) for descending.</para>
</listitem>
</itemizedlist>
</section>
@ -186,23 +186,23 @@ indicate the owner of the image
<title>Requesting Detailed Metadata on a Specific Image</title>
</info>
<para> We want to see detailed information for a specific virtual
machine image that the Glance server knows about. </para>
<para> We have queried the Glance server for a list of public
<para>We want to see detailed information for a specific virtual
machine image that the Glance server knows about.</para>
<para>We have queried the Glance server for a list of public
images and the data returned includes the `uri` field for each
available image. This `uri` field value contains the exact
location needed to get the metadata for a specific image. </para>
<para> Continuing the example from above, in order to get metadata
location needed to get the metadata for a specific image.</para>
<para>Continuing the example from above, in order to get metadata
about the first public image returned, we can issue a
<literal>HEAD</literal> request to the Glance server for the
image's URI. </para>
<para> We issue a <literal>HEAD</literal> request to
image's URI.</para>
<para>We issue a <literal>HEAD</literal> request to
<literal>http://glance.example.com/images/1</literal> to
retrieve complete metadata for that image. The metadata is
returned as a set of HTTP headers that begin with the prefix
<literal>x-image-meta-</literal>. The following shows an
example of the HTTP headers returned from the above
<literal>HEAD</literal> request: </para>
<literal>HEAD</literal> request:</para>
<literallayout class="monospaced">
x-image-meta-name Ubuntu 10.04 Plain 5GB
x-image-meta-disk-format vhd
@ -218,7 +218,7 @@ x-image-meta-is-public true
x-image-meta-owner null
x-image-meta-property-distro Ubuntu 10.04 LTS
</literallayout>
<para> All timestamps returned are in UTC The
<para>All timestamps returned are in UTC The
`x-image-meta-updated_at` timestamp is the timestamp when an
image's metadata was last updated, not its image data, as all
image data is immutable once stored in Glance There may be
@ -231,31 +231,31 @@ x-image-meta-property-distro Ubuntu 10.04 LTS
`x-image-meta-is-public` value is a boolean indicating whether
the image is publicly available The response's
`x-image-meta-owner` value is a string which may either be null
or which will indicate the owner of the image </para>
or which will indicate the owner of the image</para>
</section>
<section xml:id="retrieving-a-virtual-machine-image">
<info>
<title>Retrieving a Virtual Machine Image</title>
</info>
<para> We want to retrieve that actual raw data for a specific
virtual machine image that the Glance server knows about. </para>
<para> We have queried the Glance server for a list of public
<para>We want to retrieve that actual raw data for a specific
virtual machine image that the Glance server knows about.</para>
<para>We have queried the Glance server for a list of public
images and the data returned includes the `uri` field for each
available image. This `uri` field value contains the exact
location needed to get the metadata for a specific image. </para>
<para> Continuing the example from above, in order to get metadata
location needed to get the metadata for a specific image.</para>
<para>Continuing the example from above, in order to get metadata
about the first public image returned, we can issue a
<literal>HEAD</literal> request to the Glance server for the
image's URI. </para>
<para> We issue a <literal>GET</literal> request to
image's URI.</para>
<para>We issue a <literal>GET</literal> request to
<literal>http://glance.example.com/images/1</literal> to
retrieve metadata for that image as well as the image itself
encoded into the response body. </para>
<para> The metadata is returned as a set of HTTP headers that
encoded into the response body.</para>
<para>The metadata is returned as a set of HTTP headers that
begin with the prefix <literal>x-image-meta-</literal>. The
following shows an example of the HTTP headers returned from the
above <literal>GET</literal> request: </para>
above <literal>GET</literal> request:</para>
<literallayout class="monospaced">
x-image-meta-name Ubuntu 10.04 Plain 5GB
x-image-meta-disk-format vhd
@ -305,132 +305,132 @@ from the request, which will have content-type of
<title>Adding a New Virtual Machine Image</title>
</info>
<para> We have created a new virtual machine image in some way
<para>We have created a new virtual machine image in some way
(created a "golden image" or snapshotted/backed up an existing
image) and we wish to do two things: </para>
image) and we wish to do two things:</para>
<itemizedlist>
<listitem>
<para> Store the disk image data in Glance </para>
<para>Store the disk image data in Glance</para>
</listitem>
<listitem>
<para> Store metadata about this image in Glance </para>
<para>Store metadata about this image in Glance</para>
</listitem>
</itemizedlist>
<para> We can do the above two activities in a single call to the
<para>We can do the above two activities in a single call to the
Glance API. Assuming, like in the examples above, that a Glance
API server is running at <literal>glance.example.com</literal>,
we issue a <literal>POST</literal> request to add an image to
Glance: </para>
Glance:</para>
<literallayout class="monospaced">
POST http://glance.example.com/images/
</literallayout>
<para> The metadata about the image is sent to Glance in HTTP
<para>The metadata about the image is sent to Glance in HTTP
headers. The body of the HTTP request to the Glance API will be
the MIME-encoded disk image data. </para>
the MIME-encoded disk image data.</para>
<section xml:id="adding-image-metadata-in-http-headers">
<info>
<title>Adding Image Metadata in HTTP Headers</title>
</info>
<para> Glance will view as image metadata any HTTP header that
it receives in a </para>
<para>Glance will view as image metadata any HTTP header that
it receives in a</para>
<literallayout class="monospaced">
``POST`` request where the header key is prefixed with the strings
``x-image-meta-`` and ``x-image-meta-property-``.
</literallayout>
<para> The list of metadata headers that Glance accepts are
listed below. </para>
<para>The list of metadata headers that Glance accepts are
listed below.</para>
<itemizedlist>
<listitem>
<para>
<literal>x-image-meta-name</literal>
</para>
<para> This header is optional . Its value should be the
name of the image. </para>
<para> Note that the name of an image <emphasis>is not
<para>This header is optional . Its value should be the
name of the image.</para>
<para>Note that the name of an image <emphasis>is not
unique to a Glance node</emphasis>. It would be an
unrealistic expectation of users to know all the unique
names of all other user's images. </para>
names of all other user's images.</para>
</listitem>
<listitem>
<para>
<literal>x-image-meta-id</literal>
</para>
<para> This header is optional. </para>
<para> When present, Glance will use the supplied identifier
<para>This header is optional.</para>
<para>When present, Glance will use the supplied identifier
for the image. If the identifier already exists in that
Glance node, then a <emphasis role="strong">409
Conflict</emphasis> will be returned by Glance. </para>
<para> When this header is <emphasis>not</emphasis> present,
Conflict</emphasis> will be returned by Glance.</para>
<para>When this header is <emphasis>not</emphasis> present,
Glance will generate an identifier for the image and
return this identifier in the response (see below) </para>
return this identifier in the response (see below)</para>
</listitem>
<listitem>
<para>
<literal>x-image-meta-store</literal>
</para>
<para> This header is optional. Valid values are one of
<para>This header is optional. Valid values are one of
<literal>file</literal>, <literal>s3</literal>, or
<literal>swift</literal>
</para>
<para> When present, Glance will attempt to store the disk
<para>When present, Glance will attempt to store the disk
image data in the backing store indicated by the value of
the header. If the Glance node does not support the
backing store, Glance will return a <emphasis
role="strong">400 Bad Request</emphasis>. </para>
<para> When not present, Glance will store the disk image
role="strong">400 Bad Request</emphasis>.</para>
<para>When not present, Glance will store the disk image
data in the backing store that is marked default. See the
configuration option <literal>default_store</literal> for
more information. </para>
more information.</para>
</listitem>
<listitem>
<para>
<literal>x-image-meta-disk-format</literal>
</para>
<para> This header is optional. Valid values are one of
<para>This header is optional. Valid values are one of
<literal>aki</literal>, <literal>ari</literal>,
<literal>ami</literal>, <literal>raw</literal>,
<literal>iso</literal>, <literal>vhd</literal>,
<literal>vdi</literal>, <literal>qcow2</literal>, or
<literal>vmdk</literal>. </para>
<para> For more information, see :doc:`About Disk and
<literal>vmdk</literal>.</para>
<para>For more information, see :doc:`About Disk and
Container Formats &lt;formats&gt;` </para>
</listitem>
<listitem>
<para>
<literal>x-image-meta-container-format</literal>
</para>
<para> This header is optional. Valid values are one of
<para>This header is optional. Valid values are one of
<literal>aki</literal>, <literal>ari</literal>,
<literal>ami</literal>, <literal>bare</literal>, or
<literal>ovf</literal>. </para>
<para> For more information, see :doc:`About Disk and
<literal>ovf</literal>.</para>
<para>For more information, see :doc:`About Disk and
Container Formats &lt;formats&gt;` </para>
</listitem>
<listitem>
<para>
<literal>x-image-meta-size</literal>
</para>
<para> This header is optional. </para>
<para> When present, Glance assumes that the expected size
<para>This header is optional.</para>
<para>When present, Glance assumes that the expected size
of the request body will be the value of this header. If
the length in bytes of the request body <emphasis>does not
match</emphasis> the value of this header, Glance will
return a <emphasis role="strong">400 Bad
Request</emphasis>. </para>
<para> When not present, Glance will calculate the image's
size based on the size of the request body. </para>
Request</emphasis>.</para>
<para>When not present, Glance will calculate the image's
size based on the size of the request body.</para>
</listitem>
<listitem>
<para>
<literal>x-image-meta-checksum</literal>
</para>
<para> This header is optional. When present it shall be the
<para>This header is optional. When present it shall be the
expected <emphasis role="strong">MD5</emphasis> checksum
of the image file data. </para>
<para> When present, Glance will verify the checksum
of the image file data.</para>
<para>When present, Glance will verify the checksum
generated from the backend store when storing your image
against this value and return a <emphasis role="strong"
>400 Bad Request</emphasis> if the values do not match.
@ -440,12 +440,12 @@ POST http://glance.example.com/images/
<para>
<literal>x-image-meta-is-public</literal>
</para>
<para> This header is optional. </para>
<para> When Glance finds the string "true"
<para>This header is optional.</para>
<para>When Glance finds the string "true"
(case-insensitive), the image is marked as a public image,
meaning that any user may view its metadata and may read
the disk image from Glance. </para>
<para> When not present, the image is assumed to be
the disk image from Glance.</para>
<para>When not present, the image is assumed to be
<emphasis>not public</emphasis> and specific to a user.
</para>
</listitem>
@ -453,39 +453,39 @@ POST http://glance.example.com/images/
<para>
<literal>x-image-meta-owner</literal>
</para>
<para> This header is optional and only meaningful for
admins. </para>
<para> Glance normally sets the owner of an image to be the
<para>This header is optional and only meaningful for
admins.</para>
<para>Glance normally sets the owner of an image to be the
tenant or user (depending on the "owner_is_tenant"
configuration option) of the authenticated user issuing
the request. However, if the authenticated user has the
Admin role, this default may be overridden by setting this
header to null or to a string identifying the owner of the
image. </para>
image.</para>
</listitem>
<listitem>
<para>
<literal>x-image-meta-property-*</literal>
</para>
<para> When Glance receives any HTTP header whose key begins
<para>When Glance receives any HTTP header whose key begins
with the string prefix
<literal>x-image-meta-property-</literal>, Glance adds
the key and value to a set of custom, free-form image
properties stored with the image. The key is the
lower-cased string following the prefix
<literal>x-image-meta-property-</literal> with dashes
and punctuation replaced with underscores. </para>
<para> For example, if the following HTTP header were sent: </para>
and punctuation replaced with underscores.</para>
<para>For example, if the following HTTP header were sent:</para>
<literallayout class="monospaced">
x-image-meta-property-distro Ubuntu 10.10
</literallayout>
<para> Then a key/value pair of "distro"/"Ubuntu 10.10" will
be stored with the image in Glance. </para>
<para> There is no limit on the number of free-form
<para>Then a key/value pair of "distro"/"Ubuntu 10.10" will
be stored with the image in Glance.</para>
<para>There is no limit on the number of free-form
key/value attributes that can be attached to the image.
However, keep in mind that the 8K limit on the size of all
HTTP headers sent in a request will effectively limit the
number of image properties. </para>
number of image properties.</para>
</listitem>
</itemizedlist>
</section>
@ -494,22 +494,22 @@ x-image-meta-property-distro Ubuntu 10.10
<title>Updating an Image</title>
</info>
<para> Glance will view as image metadata any HTTP header that
it receives in a </para>
<para>Glance will view as image metadata any HTTP header that
it receives in a</para>
<literallayout class="monospaced">
``PUT`` request where the header key is prefixed with the strings
``x-image-meta-`` and ``x-image-meta-property-``.
</literallayout>
<para> If an image was previously reserved, and thus is in the
<para>If an image was previously reserved, and thus is in the
<literal>queued</literal> state, then image data can be
added by including it as the request body. If the image
already as data associated with it (e.g. not in the
<literal>queued</literal> state), then including a request
body will result in a <emphasis role="strong">409
Conflict</emphasis> exception. </para>
<para> On success, the <literal>PUT</literal> request will
return the image metadata encoded as HTTP headers. </para>
<para> See more about image statuses here: :doc:`Image Statuses
Conflict</emphasis> exception.</para>
<para>On success, the <literal>PUT</literal> request will
return the image metadata encoded as HTTP headers.</para>
<para>See more about image statuses here: :doc:`Image Statuses
&lt;statuses&gt;` </para>
</section>
</section>
@ -518,100 +518,100 @@ x-image-meta-property-distro Ubuntu 10.10
<title>Requesting Image Memberships</title>
</info>
<para> We want to see a list of the other system tenants (or
<para>We want to see a list of the other system tenants (or
users, if "owner_is_tenant" is False) that may access a given
virtual machine image that the Glance server knows about. We
take the `uri` field of the image data, append
<literal>/members</literal> to it, and issue a
<literal>GET</literal> request on the resulting URL. </para>
<para> Continuing from the example above, in order to get the
<literal>GET</literal> request on the resulting URL.</para>
<para>Continuing from the example above, in order to get the
memberships for the first public image returned, we can issue a
<literal>GET</literal> request to the Glance server for
<literal>http://glance.example.com/images/1/members</literal>.
What we will get back is JSON data such as the following: </para>
What we will get back is JSON data such as the following:</para>
<literallayout class="monospaced">
{'members': [
{'member_id': 'tenant1',
'can_share': false}
...]}
</literallayout>
<para> The `member_id` field identifies a tenant with which the
<para>The `member_id` field identifies a tenant with which the
image is shared. If that tenant is authorized to further share
the image, the `can_share` field is `true`. </para>
the image, the `can_share` field is `true`.</para>
</section>
<section xml:id="requesting-shared-images">
<info>
<title>Requesting Shared Images</title>
</info>
<para> We want to see a list of images which are shared with a
<para>We want to see a list of images which are shared with a
given tenant. We issue a <literal>GET</literal> request to
<literal>http://glance.example.com/shared-images/tenant1</literal>.
We will get back JSON data such as the following: </para>
We will get back JSON data such as the following:</para>
<literallayout class="monospaced">
{'shared_images': [
{'image_id': 1,
'can_share': false}
...]}
</literallayout>
<para> The `image_id` field identifies an image shared with the
<para>The `image_id` field identifies an image shared with the
tenant named by <emphasis>member_id</emphasis>. If the tenant is
authorized to further share the image, the `can_share` field is
`true`. </para>
`true`.</para>
</section>
<section xml:id="adding-a-member-to-an-image">
<info>
<title>Adding a Member to an Image</title>
</info>
<para> We want to authorize a tenant to access a private image. We
<para>We want to authorize a tenant to access a private image. We
issue a <literal>PUT</literal> request to
<literal>http://glance.example.com/images/1/members/tenant1</literal>.
With no body, this will add the membership to the image, leaving
existing memberships unmodified and defaulting new memberships
to have `can_share` set to `false`. We may also optionally
attach a body of the following form: </para>
attach a body of the following form:</para>
<literallayout class="monospaced">
{'member':
{'can_share': true}
}
</literallayout>
<para> If such a body is provided, both existing and new
<para>If such a body is provided, both existing and new
memberships will have `can_share` set to the provided value
(either `true` or `false`). This query will return a 204 ("No
Content") status code. </para>
Content") status code.</para>
</section>
<section xml:id="removing-a-member-from-an-image">
<info>
<title>Removing a Member from an Image</title>
</info>
<para> We want to revoke a tenant's right to access a private
<para>We want to revoke a tenant's right to access a private
image. We issue a <literal>DELETE</literal> request to
<literal>http://glance.example.com/images/1/members/tenant1</literal>.
This query will return a 204 ("No Content") status code. </para>
This query will return a 204 ("No Content") status code.</para>
</section>
<section xml:id="replacing-a-membership-list-for-an-image">
<info>
<title>Replacing a Membership List for an Image</title>
</info>
<para> The full membership list for a given image may be replaced.
<para>The full membership list for a given image may be replaced.
We issue a <literal>PUT</literal> request to
<literal>http://glance.example.com/images/1/members</literal>
with a body of the following form: </para>
with a body of the following form:</para>
<literallayout class="monospaced">
{'memberships': [
{'member_id': 'tenant1',
'can_share': false}
...]}
</literallayout>
<para> All existing memberships which are not named in the
<para>All existing memberships which are not named in the
replacement body are removed, and those which are named have
their `can_share` settings changed as specified. (The
`can_share` setting may be omitted, which will cause that
setting to remain unchanged in the existing memberships.) All
new memberships will be created, with `can_share` defaulting to
`false` if it is not specified. </para>
`false` if it is not specified.</para>
</section>
</chapter>

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xmlns:xi="http://www.w3.org/2001/XInclude"
xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0"
xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0"
xml:id="general-api-information-glance">
<title>General API Information</title>
<?dbhtml stop-chunking?>

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@ -38,7 +38,7 @@
<para>This document is for software developers who develop
applications by using the OpenStack™ Image Service
Application Programming Interface
(<abbrev>API</abbrev>) v1. </para>
(<abbrev>API</abbrev>) v1.</para>
</abstract>
<revhistory>
<revision>