openstack/openstack-manuals
Code Issues Proposed changes

Updated architecture chapter

Browse Source 
As part of the installation guide improvement project, I performed
the following operations on the architecture chapter:

1) Added new diagrams for example architectures supported by the
   the installation guide.
2) Increased detail of node function descriptions.
3) Removed potentially confusing and overwhelming logical
   architecture diagram.
4) Clarified phrasing and wording.

The contents of this chapter rely on other portions of the guide
subject to change during this project and may need additional
updates.

Change-Id: I9b887f49a7d3ec94efc748a9056ec3a643ac7899
Partial-Bug: #1291071
Implements: blueprint networking-install-guide-improvements
This commit is contained in:
Matt Kassawara 2014-03-16 19:08:53 -06:00
parent 3160afa901
commit 2294ed15a3
6 changed files with 1823 additions and 75 deletions
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10
doc/common/section_getstart_image.xml
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@ -23,12 +23,10 @@
use MySQL or SQlite.</para>
</listitem>
<listitem>
<para>Storage repository for image files. In <xref
linkend="os-logical-arch"/>, the Object Storage Service is
the image repository. However, you can configure a different
repository. The Image Service supports normal file systems,
RADOS block devices, Amazon S3, and HTTP. Some choices provide
only read-only usage.</para>
<para>Storage repository for image files. The Image Service
supports a variety of repositories including normal file systems,
Object Storage, RADOS block devices, HTTP, and Amazon S3. Some
types of repositories support only read-only usage.</para>
</listitem>
</itemizedlist>
<para>A number of periodic processes run on the Image Service to

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@ -8,113 +8,146 @@
<para>We are updating this material for Icehouse. You may find structure
and/or content issues during this process.</para>
</warning>
<para>This install guide offers a few of the many ways to install
<glossterm>OpenStack</glossterm> components and have them work together.
It is meant as a
"choose your own adventure" guide, not a comprehensive guide. The
<citetitle>OpenStack Configuration Reference</citetitle> lists
every option in all OpenStack services. Before you begin an
installation adventure, here are some things you should know about
OpenStack concepts.</para>
<xi:include href="../common/ch_getstart.xml"
xpointer="element(para1)"/>
<xi:include href="../common/ch_getstart.xml"
xpointer="element(para2)"/>
<xi:include href="../common/ch_getstart.xml"
xpointer="element(para3)"/>
<section xml:id="architecture_overview">
<title>Overview</title>
<para>The <glossterm>OpenStack</glossterm> project is an open source cloud
computing platform that supports all types of cloud environments. The
project aims for simple implementation, massive scalability, and a rich
set of features. Cloud computing experts from around the world
contribute to the project.</para>
<para>OpenStack provides an Infrastructure-as-a-Service
(<glossterm>IaaS</glossterm>) solution through a variety of complemental
services. Each service offers an application programming interface
(<glossterm>API</glossterm>) that facilitates this integration. The
following table provides a list of OpenStack services:</para>
<xi:include href="../common/ch_getstart.xml"
xpointer="element(table1)"/>
<xi:include href="../common/section_getstart_conceptual_arch.xml"/>
<xi:include href="../common/section_getstart_logical_arch.xml"/>
<section xml:id="overview-architecture">
<title>Example architectures</title>
<para>This guide enables you to choose your own OpenStack
adventure. OpenStack is highly configurable to meet different
needs with various compute, networking, and storage options.</para>
<para>This guide uses the following example architectures:</para>
<itemizedlist>
<listitem>
<para>Basic architecture with legacy networking</para>
<itemizedlist>
<listitem>
<para>The <glossterm>controller node</glossterm> runs the Identity
Service, Image Service,
dashboard, and management portion of Compute. It also contains
the associated API services, MySQL databases, and messaging
system.</para>
</listitem>
<listitem>
<para>The <glossterm>compute node</glossterm> runs the
<glossterm>hypervisor</glossterm> portion of Compute,
which operates <glossterm>tenant</glossterm>
<glossterm baseform="virtual machine (VM)">virtual machines</glossterm>.
By default, Compute uses
<glossterm baseform="kernel-based VM (KVM)">KVM</glossterm>
as the <glossterm>hypervisor</glossterm>. Compute also
provisions and operates
tenant networks and implements
<glossterm baseform="security group">security groups</glossterm>.
You can run more than one compute node.</para>
</listitem>
<listitem>
<para>When implementing this architecture, skip
<xref linkend="ch_neutron" />.</para>
</listitem>
</itemizedlist>
<figure xml:id="basic-architecture-with-legacy-networking">
<title>Basic architecture with legacy networking</title>
<para>This guide describes how to deploy these services in a functional
test environment and, by example, teaches you how to build a production
environment.</para>
</section>
<section xml:id="architecture_conceptual-architecture">
<title>Conceptual architecture</title>
<para>Launching a virtual machine or instance involves many interactions
among several services. The following diagram provides the conceptual
architecture of a typical OpenStack environment.</para>
<figure xml:id="conceptual-architecture">
<title>Conceptual architecture</title>
<mediaobject>
<imageobject>
<imagedata contentwidth="6in"
fileref="figures/basic-architecture.svg"/>
fileref="../common/figures/openstack_havana_conceptual_arch.png"/>
</imageobject>
</mediaobject>
</figure>
</section>
<section xml:id="architecture_example-architectures">
<title>Example architectures</title>
<para>OpenStack is highly configurable to meet different needs with various
compute, networking, and storage options. This guide enables you to
choose your own OpenStack adventure using a combination of basic and
optional services. This guide uses the following example
architectures:</para>
<itemizedlist>
<listitem>
<para>Two-node architecture with legacy networking. See <xref linkend="example-architecture-with-legacy-networking"/>.</para>
<itemizedlist>
<listitem>
<para>The basic
<glossterm baseform="cloud controller node">controller node</glossterm>
runs the Identity service, Image Service, management portion of
Compute, and the dashboard necessary to launch a simple instance.
It also includes supporting services such as MySQL,
<glossterm>AMQP</glossterm>, and
<glossterm>NTP</glossterm>.</para>
<para>Optionally, the controller node also runs portions of
Block Storage, Object Storage, Database Service, Orchestration,
and Telemetry. These components provide additional features for
your environment.</para>
</listitem>
<listitem>
<para>The basic <glossterm>compute node</glossterm> runs the
<glossterm>hypervisor</glossterm> portion of Compute,
which operates <glossterm>tenant</glossterm>
<glossterm baseform="virtual machine (VM)">virtual machines</glossterm>
or instances. By default, Compute uses
<glossterm baseform="kernel-based VM (KVM)">KVM</glossterm>
as the <glossterm>hypervisor</glossterm>. Compute also
provisions and operates tenant networks and implements
<glossterm baseform="security group">security groups</glossterm>.
You can run more than one compute node.</para>
<para>Optionally, the compute node also runs the Telemetry
agent. This component provides additional features for
your environment.</para>
</listitem>
</itemizedlist>
<note>
<para>When you implement this architecture, skip
<xref linkend="ch_neutron" />. To use optional services, you
might need to install additional nodes, as described in
subsequent chapters.</para>
</note>
<figure xml:id="example-architecture-with-legacy-networking">
<title>Two-node architecture with legacy networking</title>
<mediaobject>
<imageobject>
<imagedata contentwidth="6in"
fileref="figures/installguide_arch-nova.png"/>
</imageobject>
</mediaobject>
</figure>
</listitem>
<listitem>
<para>Basic architecture with OpenStack Networking (Neutron)</para>
<para>Three-node architecure with OpenStack Networking (neutron). See <xref linkend="example-architecture-with-neutron-networking"/>.</para>
<itemizedlist>
<listitem>
<para>The <glossterm baseform="cloud controller node">controller node</glossterm>
runs the Identity
Service, Image Service,
dashboard, and management portions of Compute and Networking.
It also contains the associated API services, MySQL databases,
and messaging system.</para>
<para>The basic controller node runs the Identity service, Image
Service, management portions of Compute and Networking,
Networking plug-in, and the dashboard. It also includes
supporting services such as MySQL, AMQP, and NTP.</para>
<para>Optionally, the controller node also runs portions of
Block Storage, Object Storage, Database Service, Orchestration,
and Telemetry. These components provide additional features for
your environment.</para>
</listitem>
<listitem>
<para>The network node runs the Networking plug-in agent and
several layer 3 agents that provision tenant networks and
provide services to them, including routing, <glossterm
baseform="Network Address Translation (NAT)">NAT</glossterm>,
and <glossterm>DHCP</glossterm>.
It also handles external (internet) connectivity for tenant
virtual machines.</para>
<para>The network node runs the Networking plug-in, layer 2 agent,
and several layer 3 agents that provision and operate tenant
networks. Layer 2 services include provisioning of virtual
networks and tunnels. Layer 3 services include routing,
<glossterm baseform="Network Address Translation (NAT)">NAT</glossterm>
, and <glossterm>DHCP</glossterm>. This node also handles
external (internet) connectivity for tenant virtual machines
or instances.</para>
</listitem>
<listitem>
<para>The compute node runs the hypervisor portion of Compute,
which operates tenant virtual machines. By default, Compute uses
KVM as the hypervisor. The compute node also runs the Networking
plug-in agent, which operates tenant networks and implements
security groups. You can run more than one compute node.</para>
</listitem>
<listitem>
<para>When implementing this architecture, skip
<xref linkend="nova-network" />.</para>
which operates tenant virtual machines or instances. By default
Compute uses KVM as the hypervisor. The compute node also runs
the Networking plug-in and layer 2 agent which operate tenant
networks and implement security groups. You can run more than
one compute node.</para>
<para>Optionally, the compute node also runs the Telemetry
agent. This component provides additional features for
your environment.</para>
</listitem>
</itemizedlist>
<figure xml:id="basic-architecture-with-virtual-networking">
<title>Basic architecture with OpenStack Networking (Neutron)</title>
<note>
<para>When you implement this architecture, skip
<xref linkend="nova-network" /> in <xref linkend="ch_nova" />.
To use optional services, you might need to install additional
nodes, as described in subsequent chapters.</para>
</note>
<figure xml:id="example-architecture-with-neutron-networking">
<title>Three-node architecture with OpenStack Networking (neutron)</title>
<mediaobject>
<imageobject>
<imagedata contentwidth="5in"
fileref="../common/figures/Neutron-PhysNet-Diagram.png"/>
<imagedata contentwidth="6in"
fileref="figures/installguide_arch-neutron.png"/>
</imageobject>
</mediaobject>
</figure>
</listitem>
</itemizedlist>
<para>You can add nodes that run Block Storage or Object Storage to
either of these architectures.</para>
</section>
</chapter>

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