3ca32b8434
Change capitalization as discussed on openstack-docs mailing list. Change-Id: I2ad81bffbd59bdd8b908664bb0a1ee16da1bf7ae
51 lines
2.5 KiB
XML
51 lines
2.5 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<section xmlns="http://docbook.org/ns/docbook"
|
|
xmlns:xi="http://www.w3.org/2001/XInclude"
|
|
xmlns:xlink="http://www.w3.org/1999/xlink"
|
|
version="5.0"
|
|
xml:id="image-service-overview">
|
|
<title>OpenStack Image service</title>
|
|
<para>The OpenStack Image service is central to Infrastructure-as-a-Service (IaaS)
|
|
as shown in <xref linkend="conceptual-architecture"/>. It accepts API requests
|
|
for disk or server images, and image metadata from end users or OpenStack Compute
|
|
components. It also supports the storage of disk or server images on various
|
|
repository types, including OpenStack Object Storage.
|
|
</para>
|
|
<para>A number of periodic processes run on the OpenStack Image service to
|
|
support caching. Replication services ensure consistency and
|
|
availability through the cluster. Other periodic processes
|
|
include auditors, updaters, and reapers.</para>
|
|
<para>The OpenStack Image service includes the following
|
|
components:</para>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><systemitem class="service">glance-api</systemitem></term>
|
|
<listitem><para>Accepts Image API calls for image discovery,
|
|
retrieval, and storage.</para></listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><systemitem class="service">glance-registry</systemitem></term>
|
|
<listitem><para>Stores, processes, and retrieves metadata about
|
|
images. Metadata includes items such as size and type.</para>
|
|
<note><title>Security note</title>
|
|
<para>The registry is a private internal service meant for use
|
|
by OpenStack Image service. Do not disclose it to
|
|
users.</para></note>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>Database</term>
|
|
<listitem><para>Stores image metadata and you can choose your database
|
|
depending on your preference. Most deployments use MySQL or
|
|
SQLite.</para></listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>Storage repository for image files</term>
|
|
<listitem><para>Various repository types are supported including
|
|
normal file systems, Object Storage, RADOS block devices, HTTP, and
|
|
Amazon S3. Note that some repositories will only support
|
|
read-only usage.</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</section>
|