109 lines
5.1 KiB
XML
109 lines
5.1 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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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" version="5.0"
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xml:id="module001-ch001-intro-text">
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<title>Introduction to OpenStack</title>
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<para>OpenStack is a cloud operating system that controls large
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pools of compute, storage, and networking resources throughout a
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data center, all managed through a dashboard that gives
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administrators control while empowering users to provision
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resources through a web interface.</para>
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<para>Cloud computing provides users with access to a shared
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collection of computing resources: networks for transfer, servers
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for storage, and applications or services for completing
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tasks.</para>
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<para>The compelling features of a cloud are:</para>
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<itemizedlist>
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<listitem>
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<para>On-demand self-service: Users can automatically provision
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needed computing capabilities, such as server time and network
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storage, without requiring human interaction with each service
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provider.</para>
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</listitem>
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<listitem>
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<para>Network access: Any computing capabilities are available
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over the network. Many different devices are allowed access
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through standardized mechanisms.</para>
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</listitem>
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<listitem>
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<para>Resource pooling: Multiple users can access clouds that
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serve other consumers according to demand.</para>
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</listitem>
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<listitem>
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<para>Elasticity: Provisioning is rapid and scales out or is
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based on need.</para>
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</listitem>
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<listitem>
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<para>Metered or measured service: Cloud systems can optimize
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and control resource use at the level that is appropriate for
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the service. Services include storage, processing, bandwidth,
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and active user accounts. Monitoring and reporting of resource
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usage provides transparency for both the provider and consumer
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of the utilized service.</para>
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</listitem>
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</itemizedlist>
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<para>Cloud computing offers different service models depending on
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the capabilities a consumer may require.</para>
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<itemizedlist>
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<listitem>
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<para>SaaS: Software-as-a-Service. Provides the consumer the
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ability to use the software in a cloud environment, such as
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web-based email for example.</para>
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</listitem>
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<listitem>
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<para>PaaS: Platform-as-a-Service. Provides the consumer the
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ability to deploy applications through a programming language
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or tools supported by the cloud platform provider. An example
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of Platform-as-a-service is an Eclipse/Java programming
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platform provided with no downloads required.</para>
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</listitem>
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<listitem>
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<para>IaaS: Infrastructure-as-a-Service. Provides infrastructure
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such as computer instances, network connections, and storage
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so that people can run any software or operating
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system.</para>
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</listitem>
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</itemizedlist>
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<para>Terms such as public cloud or private cloud refer to the
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deployment model for the cloud. A private cloud operates for a
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single organization, but can be managed on-premise or off-premise.
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A public cloud has an infrastructure that is available to the
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general public or a large industry group and is likely owned by a
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cloud services company.</para>
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<para>Clouds can also be described as hybrid. A hybrid cloud can be
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a deployment model, as a composition of both public and private
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clouds, or a hybrid model for cloud computing may involve both
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virtual and physical servers.</para>
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<para>Cloud computing can help with large-scale computing needs or
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can lead consolidation efforts by virtualizing servers to make
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more use of existing hardware and potentially release old hardware
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from service. Cloud computing is also used for collaboration
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because of its high availability through networked computers.
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Productivity suites for word processing, number crunching, and
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email communications, and more are also available through cloud
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computing. Cloud computing also avails additional storage to the
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cloud user, avoiding the need for additional hard drives on each
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user's desktop and enabling access to huge data storage capacity
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online in the cloud.</para>
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<para>When you explore OpenStack and see what it means technically,
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you can see its reach and impact on the entire world.</para>
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<para>OpenStack is an open source software for building private and
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public clouds which delivers a massively scalable cloud operating
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system.</para>
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<informaltable class="c20">
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<tbody>
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<tr>
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<td rowspan="1" colspan="1">OpenStack is backed up by a global
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community of technologists, developers, researchers,
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corporations and cloud computing experts.</td>
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<td rowspan="1" colspan="1"><inlinemediaobject>
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<imageobject>
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<imagedata fileref="figures/image11.png"/>
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</imageobject>
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</inlinemediaobject></td>
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</tr>
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</tbody>
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</informaltable>
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</chapter>
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