50 lines
2.0 KiB
XML
50 lines
2.0 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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version="5.0"
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xml:id="logical-architecture">
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<title>Logical architecture</title>
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<para>To design, deploy, and configure OpenStack, administrators must understand the logical architecture.</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><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.</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>Script</term>
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<listitem>
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<para>Installs a virtual environment and runs tests. For
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example, the <code>run_tests.sh</code> script installs a virtual environment and runs unit tests on a service.</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>Command-line interface (CLI)</term>
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<listitem>
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<para>Enables users to submit API
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calls to OpenStack services through easy-to-use
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commands.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>The following diagram shows the most common, but not the only,
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architecture for an OpenStack cloud:</para>
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<!-- Source files in this repository in doc/src/docbkx/common/figures/openstack-arch-havana-v1.zip -->
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<figure xml:id="os-logical-arch">
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<title>Logical architecture</title>
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<mediaobject>
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<imageobject>
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<imagedata
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fileref="figures/openstack-arch-havana-logical-v1.jpg"
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contentwidth="6.5in"/>
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</imageobject>
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</mediaobject>
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</figure>
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<para>As in <xref linkend="concept_arch"/>, end users can interact
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through the dashboard, CLIs, and APIs. All services authenticate
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through a common Identity Service and individual services interact
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with each other through public APIs, except where privileged
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administrator commands are necessary.</para>
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</section>
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