149fc8e4bd
I added several warnings informing users about potential structure and/or content issues during the update process for Icehouse. I will remove these warnings after we complete the process. Change-Id: Ic13fbbdf60005d5e87ce90e7f3eb225e7e5d5698 Partial-Bug: #1291071
121 lines
5.5 KiB
XML
121 lines
5.5 KiB
XML
<chapter 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" version="5.0"
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xml:id="ch_overview">
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<?dbhtml stop-chunking?>
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<title>Architecture</title>
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<warning>
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<para>We are updating this material for Icehouse. You may find structure
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and/or content issues during this process.</para>
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</warning>
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<para>This install guide offers a few of the many ways to install
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<glossterm>OpenStack</glossterm> components and have them work together.
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It is meant as a
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"choose your own adventure" guide, not a comprehensive guide. The
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<citetitle>OpenStack Configuration Reference</citetitle> lists
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every option in all OpenStack services. Before you begin an
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installation adventure, here are some things you should know about
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OpenStack concepts.</para>
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<xi:include href="../common/ch_getstart.xml"
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xpointer="element(para1)"/>
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<xi:include href="../common/ch_getstart.xml"
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xpointer="element(para2)"/>
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<xi:include href="../common/ch_getstart.xml"
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xpointer="element(para3)"/>
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<xi:include href="../common/ch_getstart.xml"
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xpointer="element(table1)"/>
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<xi:include href="../common/section_getstart_conceptual_arch.xml"/>
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<xi:include href="../common/section_getstart_logical_arch.xml"/>
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<section xml:id="overview-architecture">
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<title>Example architectures</title>
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<para>This guide enables you to choose your own OpenStack
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adventure. OpenStack is highly configurable to meet different
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needs with various compute, networking, and storage options.</para>
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<para>This guide uses the following example architectures:</para>
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<itemizedlist>
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<listitem>
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<para>Basic architecture with legacy networking</para>
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<itemizedlist>
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<listitem>
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<para>The <glossterm>controller node</glossterm> runs the Identity
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Service, Image Service,
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dashboard, and management portion of Compute. It also contains
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the associated API services, MySQL databases, and messaging
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system.</para>
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</listitem>
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<listitem>
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<para>The <glossterm>compute node</glossterm> runs the
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<glossterm>hypervisor</glossterm> portion of Compute,
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which operates <glossterm>tenant</glossterm>
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<glossterm baseform="virtual machine (VM)">virtual machines</glossterm>.
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By default, Compute uses
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<glossterm baseform="kernel-based VM (KVM)">KVM</glossterm>
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as the <glossterm>hypervisor</glossterm>. Compute also
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provisions and operates
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tenant networks and implements
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<glossterm baseform="security group">security groups</glossterm>.
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You can run more than one compute node.</para>
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</listitem>
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<listitem>
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<para>When implementing this architecture, skip
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<xref linkend="ch_neutron" />.</para>
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</listitem>
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</itemizedlist>
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<figure xml:id="basic-architecture-with-legacy-networking">
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<title>Basic architecture with legacy networking</title>
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<mediaobject>
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<imageobject>
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<imagedata contentwidth="6in"
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fileref="figures/basic-architecture.svg"/>
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</imageobject>
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</mediaobject>
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</figure>
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</listitem>
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<listitem>
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<para>Basic architecture with OpenStack Networking (Neutron)</para>
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<itemizedlist>
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<listitem>
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<para>The <glossterm baseform="cloud controller node">controller node</glossterm>
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runs the Identity
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Service, Image Service,
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dashboard, and management portions of Compute and Networking.
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It also contains the associated API services, MySQL databases,
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and messaging system.</para>
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</listitem>
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<listitem>
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<para>The network node runs the Networking plug-in agent and
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several layer 3 agents that provision tenant networks and
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provide services to them, including routing, <glossterm
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baseform="Network Address Translation (NAT)">NAT</glossterm>,
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and <glossterm>DHCP</glossterm>.
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It also handles external (internet) connectivity for tenant
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virtual machines.</para>
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</listitem>
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<listitem>
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<para>The compute node runs the hypervisor portion of Compute,
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which operates tenant virtual machines. By default, Compute uses
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KVM as the hypervisor. The compute node also runs the Networking
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plug-in agent, which operates tenant networks and implements
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security groups. You can run more than one compute node.</para>
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</listitem>
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<listitem>
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<para>When implementing this architecture, skip
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<xref linkend="nova-network" />.</para>
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</listitem>
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</itemizedlist>
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<figure xml:id="basic-architecture-with-virtual-networking">
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<title>Basic architecture with OpenStack Networking (Neutron)</title>
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<mediaobject>
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<imageobject>
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<imagedata contentwidth="5in"
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fileref="../common/figures/Neutron-PhysNet-Diagram.png"/>
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</imageobject>
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</mediaobject>
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</figure>
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</listitem>
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</itemizedlist>
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<para>You can add nodes that run Block Storage or Object Storage to
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either of these architectures.</para>
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</section>
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</chapter>
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