4dee6f8a12
Conceptual architecture is still havana. Therefore we add missing core projects. Change-Id: If61dfd19bdeb19f57b1dd4759cc092d582c3bb56 Closes-Bug: #1452963
259 lines
13 KiB
XML
259 lines
13 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE chapter [
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<!ENTITY % openstack SYSTEM "../common/entities/openstack.ent">
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%openstack;
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]>
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<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"
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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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<section xml:id="architecture_overview">
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<title>Overview</title>
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<para>The <glossterm>OpenStack</glossterm> project is an open source cloud
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computing platform that supports all types of cloud environments. The
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project aims for simple implementation, massive scalability, and a rich
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set of features. Cloud computing experts from around the world
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contribute to the project.</para>
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<para>OpenStack provides an Infrastructure-as-a-Service
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(<glossterm>IaaS</glossterm>) solution through a variety of complemental
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services. Each service offers an application programming interface
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(<glossterm>API</glossterm>) that facilitates this integration. The
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following table provides a list of OpenStack services:</para>
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<xi:include href="../common/ch_getstart.xml"
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xpointer="element(table1)"/>
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<para>This guide describes how to deploy these services in a functional
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test environment and, by example, teaches you how to build a production
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environment. Realistically, you would use automation tools such as
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Ansible, Chef, and Puppet to deploy and manage a production
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environment.</para>
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</section>
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<section xml:id="architecture_conceptual-architecture">
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<title>Conceptual architecture</title>
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<para>Launching a virtual machine or instance involves many interactions
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among several services. The following diagram provides the conceptual
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architecture of a typical OpenStack environment.</para>
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<figure xml:id="conceptual-architecture">
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<title>Conceptual architecture</title>
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<mediaobject>
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<imageobject>
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<imagedata contentwidth="6in"
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fileref="../common/figures/openstack_kilo_conceptual_arch.png"/>
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</imageobject>
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</mediaobject>
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</figure>
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</section>
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<section xml:id="architecture_example-architectures">
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<title>Example architectures</title>
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<para>OpenStack is highly configurable to meet different needs with various
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compute, networking, and storage options. This guide enables you to
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choose your own OpenStack adventure using a combination of core and
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optional services. This guide uses the following example
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architectures:</para>
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<itemizedlist>
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<listitem>
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<para>Three-node architecture with OpenStack Networking
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(neutron) and optional nodes for Block Storage and Object
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Storage services.</para>
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<itemizedlist>
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<listitem>
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<para>The
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<glossterm baseform="cloud controller node"
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>controller node</glossterm> runs the Identity service, Image
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Service, management portions of Compute and Networking,
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Networking plug-in, and the dashboard. It also includes
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supporting services such as a SQL database,
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<glossterm>message queue</glossterm>, and
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<glossterm>Network Time Protocol (NTP)</glossterm>.</para>
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<para>Optionally, the controller node runs portions of
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Block Storage, Object Storage, Orchestration, Telemetry,
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Database, and Data processing services. These
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components provide additional features for your
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environment.</para>
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</listitem>
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<listitem>
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<para>The network node runs the Networking plug-in and
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several agents that provision tenant networks and provide
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switching, routing,
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<glossterm baseform="Network Address Translation (NAT)"
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>NAT</glossterm>, and <glossterm>DHCP</glossterm> services.
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This node also handles external (Internet) connectivity for
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tenant virtual machine instances.</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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that operates <glossterm>tenant</glossterm>
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<glossterm baseform="virtual machine (VM)">virtual machines</glossterm>
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or instances. 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>. The compute node
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also runs the Networking plug-in and an agent that connect
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tenant networks to instances and provide firewalling
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(<glossterm baseform="security group"
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>security groups</glossterm>) services. You can run more
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than one compute node.</para>
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<para>Optionally, the compute node runs a Telemetry
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agent to collect meters. Also, it can contain a third
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network interface on a separate storage network to improve
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performance of storage services.</para>
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</listitem>
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<listitem>
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<para>The optional Block Storage node contains the disks that
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the Block Storage service provisions for tenant virtual machine
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instances. You can run more than one of these nodes.</para>
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<para>Optionally, the Block Storage node runs a Telemetry
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agent to collect meters. Also, it can contain a second
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network interface on a separate storage network to improve
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performance of storage services.</para>
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</listitem>
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<listitem>
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<para>The optional Object Storage nodes contain the disks that
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the Object Storage service uses for storing accounts,
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containers, and objects. You can run more than two of these
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nodes. However, the minimal architecture example requires
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two nodes.</para>
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<para>Optionally, these nodes can contain a second network
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interface on a separate storage network to improve
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performance of storage services.</para>
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</listitem>
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</itemizedlist>
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<note>
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<para>When you implement this architecture, skip
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<xref linkend="section_nova-networking" /> in
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<xref linkend="ch_networking" />. Optional services might
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require additional nodes or additional resources on existing
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nodes.</para>
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</note>
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<figure xml:id="example-architecture-with-neutron-networking-hw">
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<title>Minimal architecture example with OpenStack Networking
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(neutron)—Hardware requirements</title>
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<mediaobject>
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<imageobject>
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<imagedata contentwidth="6in"
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fileref="../common/figures/installguidearch-neutron-hw.png"/>
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</imageobject>
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</mediaobject>
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</figure>
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<figure xml:id="example-architecture-with-neutron-networking-networks">
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<title>Minimal architecture example with OpenStack Networking
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(neutron)—Network layout</title>
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<mediaobject>
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<imageobject>
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<imagedata contentwidth="6in"
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fileref="../common/figures/installguidearch-neutron-networks.png"/>
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</imageobject>
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</mediaobject>
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</figure>
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<figure xml:id="example-architecture-with-neutron-networking-services">
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<title>Minimal architecture example with OpenStack Networking
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(neutron)—Service layout</title>
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<mediaobject>
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<imageobject>
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<imagedata contentwidth="6in"
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fileref="../common/figures/installguidearch-neutron-services.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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<listitem>
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<para>Two-node architecture with legacy networking
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(nova-network) and optional nodes for Block Storage and
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Object Storage services.</para>
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<itemizedlist>
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<listitem>
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<para>The
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<glossterm baseform="cloud controller node"
|
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>controller node</glossterm> runs the Identity service,
|
|
Image service, management portion of Compute, and the
|
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dashboard. It also includes supporting services such as
|
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a SQL database, <glossterm>message queue</glossterm>, and
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<glossterm>Network Time Protocol (NTP)</glossterm>.</para>
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<para>Optionally, the controller node runs portions of
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Block Storage, Object Storage, Orchestration, Telemetry,
|
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Database, and Data processing services. These
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components provide additional features for your
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environment.</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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that operates <glossterm>tenant</glossterm>
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<glossterm baseform="virtual machine (VM)">virtual machines</glossterm>
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or instances. 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 tenant networks and provides firewalling
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(<glossterm baseform="security group"
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>security groups</glossterm>) services. You can run more
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than one compute node.</para>
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<para>Optionally, the compute node runs a Telemetry
|
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agent to collect meters. Also, it can contain a third
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network interface on a separate storage network to improve
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performance of storage services.</para>
|
|
</listitem>
|
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<listitem>
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<para>The optional Block Storage node contains the disks that
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the Block Storage service provisions for tenant virtual machine
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instances. You can run more than one of these nodes.</para>
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<para>Optionally, the Block Storage node runs a Telemetry
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agent to collect meters. Also, it can contain a second
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network interface on a separate storage network to improve
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performance of storage services.</para>
|
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</listitem>
|
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<listitem>
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<para>The optional Object Storage nodes contain the disks that
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the Object Storage service uses for storing accounts,
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containers, and objects. You can run more than two of these
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nodes. However, the minimal architecture example requires
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two nodes.</para>
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<para>Optionally, these nodes can contain a second network
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interface on a separate storage network to improve
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performance of storage services.</para>
|
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</listitem>
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</itemizedlist>
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<note>
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<para>When you implement this architecture, skip
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<xref linkend="section_neutron-networking" /> in
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<xref linkend="ch_networking" />. To use optional services, you
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might need to build additional nodes, as described in
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subsequent chapters.</para>
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</note>
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<figure xml:id="example-architecture-with-legacy-networking-hw">
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<title>Minimal architecture example with legacy networking
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(nova-network)—Hardware requirements</title>
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<mediaobject>
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<imageobject>
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<imagedata contentwidth="6in"
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fileref="../common/figures/installguidearch-nova-hw.png"/>
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</imageobject>
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</mediaobject>
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</figure>
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<figure xml:id="example-architecture-with-legacy-networking-networks">
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<title>Minimal architecture example with legacy networking
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(nova-network)—Network layout</title>
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<mediaobject>
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<imageobject>
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<imagedata contentwidth="6in"
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fileref="../common/figures/installguidearch-nova-networks.png"/>
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</imageobject>
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</mediaobject>
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</figure>
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<figure xml:id="example-architecture-with-legacy-networking-services">
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<title>Minimal architecture example with legacy networking
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(nova-network)—Service layout</title>
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<mediaobject>
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<imageobject>
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<imagedata contentwidth="6in"
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fileref="../common/figures/installguidearch-nova-services.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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</section>
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</chapter>
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