0393934828
Follow the Documentaion conventions: https://wiki.openstack.org/wiki/Documentation/Conventions Change-Id: I16078f5bfc3c47002f43f23be83b03c1f6f938fe
102 lines
3.6 KiB
XML
102 lines
3.6 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<part version="5.0" xml:id="architecture"
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xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:ns5="http://www.w3.org/2000/svg"
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xmlns:ns4="http://www.w3.org/1998/Math/MathML"
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xmlns:ns3="http://www.w3.org/1999/xhtml"
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xmlns:ns="http://docbook.org/ns/docbook">
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<title>Architecture</title>
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<partintro>
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<para>Designing an OpenStack cloud is a great achievement. It requires a
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robust understanding of the requirements and needs of the cloud's users to
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determine the best possible configuration to meet them. OpenStack provides
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a great deal of flexibility to achieve your needs, and this part of the
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book aims to shine light on many of the decisions you need to make during
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the process.</para>
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<para>To design, deploy, and configure OpenStack, administrators must
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understand the logical architecture. A diagram can help you envision all
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the integrated services within OpenStack and how they interact with each
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other.<indexterm class="singular">
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<primary>modules, types of</primary>
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</indexterm><indexterm class="singular">
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<primary>OpenStack</primary>
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<secondary>module types in</secondary>
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</indexterm></para>
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<para>OpenStack modules are one of the following types:</para>
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<variablelist>
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<varlistentry>
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<term>Daemon</term>
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<listitem>
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<para>Runs as a background process. On Linux platforms, a daemon is
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usually installed as a service.<indexterm class="singular">
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<primary>daemons</primary>
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<secondary>basics of</secondary>
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</indexterm></para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>Script</term>
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<listitem>
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<para>Installs a virtual environment and runs tests.<indexterm
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class="singular">
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<primary>script modules</primary>
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</indexterm></para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>Command-line interface (CLI)</term>
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<listitem>
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<para>Enables users to submit API calls to OpenStack services
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through commands.<indexterm class="singular">
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<primary>Command-line interface (CLI)</primary>
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</indexterm></para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>As shown, end users can interact through the dashboard, CLIs, and
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APIs. All services authenticate through a common Identity service, and
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individual services interact with each other through public APIs, except
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where privileged administrator commands are necessary. <xref
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linkend="openstack-diagram" /> shows the most common, but not the
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only logical architecture for an OpenStack cloud.</para>
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<figure xml:id="openstack-diagram">
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<title>OpenStack Logical Architecture (<link
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xlink:href="http://docs.openstack.org/openstack-ops/content/figures/2/figures/osog_0001.png"
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/>)</title>
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<mediaobject>
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<imageobject>
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<imagedata fileref="http://git.openstack.org/cgit/openstack/operations-guide/plain/doc/openstack-ops/figures/osog_0001.png" width="6in"/>
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</imageobject>
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</mediaobject>
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</figure>
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</partintro>
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<xi:include href="ch_arch_examples.xml" />
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<xi:include href="ch_arch_provision.xml" />
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<xi:include href="ch_arch_cloud_controller.xml" />
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<xi:include href="ch_arch_compute_nodes.xml" />
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<xi:include href="ch_arch_scaling.xml" />
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<xi:include href="ch_arch_storage.xml" />
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<xi:include href="ch_arch_network_design.xml" />
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</part>
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