Ubuntu企业云架构：内部亚马逊EC2体验
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"Ubuntu Enterprise Cloud 是一款由 Canonical 公司推出的开源云计算平台，它提供了类似亚马逊 EC2 的基础设施服务，可以在企业内部署。该平台基于 Eucalyptus 系统，实现了 EC2 API 的开源版本，旨在简化企业构建和管理内部云的过程，使企业能够创建自己的自助式基础设施。由于技术开源，UEC 不需要任何许可证费用或订阅费，用户可以自由试验和部署。同时， Canonical 提供免费更新，并可直接购买支持合同。UEC 主要面向希望在公司数据中心内实现自助式 IT 服务，但又避免被特定供应商锁定、昂贵的持续产品许可或使用不受公共提供商支持的非标准工具的企业。本文档旨在深入解析 Ubuntu Enterprise Cloud 的架构，帮助企业理解如何利用这一技术构建内部云环境。"
Ubuntu Enterprise Cloud (UEC) 是 Ubuntu 操作系统针对企业级云服务的解决方案，它通过 Eucalyptus 系统实现对亚马逊 EC2 服务的模拟，使得企业可以在内部防火墙后构建类似 AWS 的云基础设施。Eucalyptus 是一个遵循 EC2 API 规范的开源软件，确保了与 AWS 的兼容性，从而降低了迁移成本和学习曲线。
UEC 的一大优势在于其开源本质，这意味着企业可以免费使用、实验和部署该技术，无需支付额外的许可费用。这种开放性鼓励了创新和试验，同时也降低了初期投入。Canonical 作为 Ubuntu 的维护者，为企业提供免费的更新服务，并且如果需要，企业可以直接向 Canonical 购买技术支持合同，确保在使用过程中得到专业的帮助。
UEC 的设计目标是帮助企业简化内部云的构建和管理，让企业能够快速响应业务需求，创建自服务的 IT 基础设施。它适合那些希望保持灵活性，避免厂商锁定，同时又要控制成本和统一管理工具的企业。使用 UEC，企业可以构建自己的私有云，确保数据安全，同时还能享受公有云的便利性，如弹性扩展和按需付费。
这篇技术白皮书详细介绍了 Ubuntu Enterprise Cloud 的架构，包括其组件、工作流程、安全性以及如何与现有 IT 架构集成。通过阅读，读者将能理解 UEC 如何实现云服务的自动化管理和资源调度，以及如何在企业环境中部署和管理这些服务。此外，白皮书可能还会讨论如何配置、监控和优化 UE
Vocabulary
This section defines the various acronyms used throughout this document.
Acronym Expansion Definition
AMI Amazon Machine Image A file containing a predefined virtual machine to use as the base of
an instance on the Amazon cloud.
API Application Programming
Interface
A set of functions that a programme or person can use to send
request and receive results from another programme.
AWS Amazon Web Services The collection of services that Amazon provides which compose
the Amazon cloud offering.
CC Cluster Controller See the “UEC Elements>Cluster Controller” section of this
document.
CLC Cloud Controller See the “UEC Elements>Cloud Controller” section of this
document.
EBS Elastic Block Storage See the “UEC Elements>Elastic Block Storage Controller” section
of this document.
EC2 Elastic Cloud Compute Name of the part of AWS that handles instantiating AMIs
IaaS Infrastructure as a Service One of the three base elements that form the common
understanding of the word cloud, IaaS is the layer that provides
virtual machine running and means for it to store data in a raw
form.
MI Machine Images A file containing a predefined virtual machine to use as the base of
an instance on UEC. UEC images are compatible in form and
function with AMIs.
Minst Machine Instance A running instance of a virtual machine defined by an MI
NC Node Controller See the “UEC Elements>Node Controller” section of this document.
PaaS Platform as a Service One of the three base elements that form the common
understanding of the word cloud, PaaS is the layer that provides
advanced programming interfaces to manipulate data and present
it to the outside world.
S3 Simple Storage Service Amazon S3 (Simple Storage Service) is an online storage web
service offered by Amazon Web Services. Amazon S3 provides
storage through a simple web services interface and API.
SaaS Software as a Service One of the three base elements that form the common
understanding of the word cloud, SaaS is the layer that provides a
complete application service on a cloud that can be directly used by
end users.
UEC Ubuntu Enterprise Cloud See this entire document for a complete definition.
WS3 Walrus Storage Controller See the “UEC Elements>Walrus Storage Controller” section of this
document. It can be used with the same API as Amazon's S3
Ubuntu Enterprise Cloud Architecture 4 www.canonical.com
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