fac23cb047
Since we have now a niceness gate, let's remove the known failures. Change-Id: I01684aee61e18e76f6523a466e28b8252e577f6f
129 lines
6.4 KiB
XML
129 lines
6.4 KiB
XML
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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="module001-ch001-intro-text">
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<title>Introduction To OpenStack</title>
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<para>Cloud Computing’s hype has certainly attracted IT Giants and
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the entire Open Source community's attention, amidst all this
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chaos of disrupting the software world and the way we saw and
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thought about it. We need to enlighten ourselves with this massive
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change as time again, entire Open Source community has seen the
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rise of yet another project which is called as OpenStack. It is
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believed that OpenStack will have a similar impact on the future
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computing as Linux had on the ‘Post Unix’ era. This is not only
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affecting the softwares, IT industry or the OpenSource world but
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also the Scientific, Commercial and Domestic part of the world.
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Cloud Computing has proven and solved many challenges and also cut
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time and expenditure, OpenStack pitches in to make OPEX an Open
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phenomenon. It is going to innovate Education to a further greater
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extent, that too at an unimaginable and massive rate. Every
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student will be exposed with the tools and the resources which are
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locked in at high level scientific and corporate places which are
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usually tough to get in touch with, further innovating the pace of
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education and expanding its possibilities. Being open in nature,
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these resources are free to use and modify, tailor them at no cost,
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shape them as per your requirements and let the cloud do all the
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hard work.</para>
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<para>In data centers today, many computers suffer under-utilization
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in computing power and networking bandwidth. For example, projects
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may need a large amount of computing capacity to complete a
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computation, but no longer need the computing power after
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completing the computation. You want cloud computing when you want
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a service that's available on-demand with the flexibility to bring
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it up or down through automation or with little intervention. Much
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like the electrical power we receive each day, cloud computing
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provides subscribers or users with access to a shared collection
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of computing resources: networks for transfer, servers for
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storage, and applications or services for completing tasks.</para>
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<para>These are the compelling features of a cloud:</para>
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<itemizedlist>
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<listitem>
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<para>On-demand self-service: Users can provision servers and
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networks with little human intervention.</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 in
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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: Just like utilities that are
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paid for by the hour, clouds should optimize resource use and
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control it for the level of service or type of servers such as
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storage or processing.</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>When you hear terms such as public cloud or private cloud,
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these refer to the deployment model for the cloud. A private cloud
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operates for a single organization, but can be managed on-premise
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or off-premise. A public cloud has an infrastructure that is
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available to the general public or a large industry group and is
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likely owned by a 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>Let’s take a peek into OpenStack, see what it means
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technically, its reach and its 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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