OpenStack云应用开发实战指南：专家带你快速上手

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"《OpenStack云应用开发》(Wrox, 2015)是一本专为OpenStack开发者设计的专业书籍，旨在提供高效、实用的指导，跳过基础开发环节，直击核心。作者由Infoblox、Gigaspaces、GoDaddy和Comcast等社区内的OpenStack专家撰写，他们将带领读者在OpenStack平台上开展工作，无需担忧底层硬件，专注于构建大型、可扩展的应用。书中通过一个实际的OpenStack搭建过程，详细展示了各项技术如何协同工作，并分享了专业技巧和最佳实践，以提升产品的竞争力。本书涵盖了OpenStack服务的基本构建块，如网络在OpenStack生态系统中的集成，企业虚拟化网络功能的部署，容器技术的应用，以及数据保护等多个关键领域。对于希望快速掌握OpenStack开发的人来说，这本书是一份理想的路线图，帮助开发者迅速融入并提升在OpenStack平台上的开发能力。该书由John Wiley & Sons出版，版权信息表明它于2016年发行，同时在加拿大同步发行。电子版的ISBN号也一应俱全，强调了其数字化时代的可访问性。书中关于复制和传播的权利，明确遵循美国1976年版权法的相关规定，确保了知识产权的尊重。通过阅读《OpenStack云应用开发》，读者不仅能获得技术细节，还能学会如何在实际项目中灵活运用OpenStack的各项功能，提升开发效率，适应云计算时代的需求。对于任何寻求在OpenStack世界中建立强大应用的开发者来说，这是一本不可多得的参考资料。"

xiv

INTRODUCTION

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http://p2p.wrox.com, you will nd a number of different forums that will help you, not only as

you read this book, but also as you develop your own applications. To join the forums, just follow

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❘

CHAPTER 1 IntroducIng openStack

In Figure 1-1, “Manually Provisioned Infrastructure” represents the traditional method of build-

ing your information technology infrastructure—this is not cloud computing. In this environment,

physical machines are racked, connected, and congured on a one-by-one basis. This provides com-

plete control, but requires substantial time and effort to build out, or to change when necessary. Of

course, all clouds need to run on physical gear at some point, so this provides the basic foundation

for everything else. One of the keys to making cloud computing successful, however, is to move the

complexity out of this layer and up higher in the stack.

Infrastructure-as-a-Service (IaaS) is the most basic layer in the cloud computing stack. This is

OpenStack’s primary focus, as well as the primary focus for AWS. It enables automated or self-

service provisioning of compute, networking, and storage. Typically, these resources are provided as

Virtual Machines (VMs), but you could also use it to spin up bare metal servers (i.e. physical hosts).

This is known as “Metal-as-a-Service,” and OpenStack provides a project for managing this service

as well. Alternatively, you can also spin up containers rather than VMs or bare metal servers. The

essential point is that it enables the provisioning of compute instances, with (optionally) attached

networking and storage.

Platform-as-a-Service (PaaS) builds on top of IaaS to enable the provisioning of applications,

rather than simply the infrastructure that might be used to run the application. So, a PaaS pro-

vides core common services needed by applications, along with the machinery to congure and

deploy applications to use those services. A PaaS typically will provide a complete application

stack (web server, application server, database server, etc.) into which you can easily deploy your

application. Heroku (

https://www.heroku.com) is an example of a popular PaaS for applica-

tions built with a variety of standard frameworks, such as Ruby-on-Rails. With Heroku you can

deploy your application to the Internet with a simple

git push. As the application author and

deployer, you don’t need to worry about conguring and deploying the different tiers, or even

worry about how to scale them. If you follow the Heroku conventions, everything is handled by

the PaaS.

Software-as-a-Service (SaaS) is the layer farthest from the underlying physical infrastructure. It may

be built on IaaS or a PaaS, but need not be—the point is the user never really knows. This is the sim-

plest form of cloud computing from the point of view of the user because they have no insight into

the actual mechanics or systems behind the service. It’s just a service they use. Often this is provided

FIGURE1-1 

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