私有云和公有云有什么区别？
私有云和公有云有什么区别？
请定义两者并给出用法示例。
What are the differences between private cloud and public cloud ?
Please define both and giving examples with usage.
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公共云通过 Web 应用程序/Web 服务（通常通过 Internet 连接）作为服务提供。私有云和内部云部署在防火墙内部，由用户组织管理。
还有另一种类型的云，即混合云。对于大多数企业来说，由多个内部和/或外部提供商组成的混合云环境是典型的。
您将获得更多了解 此处。
A public cloud is offered as a service via web applications/web services( usually over an Internet connection). Private cloud and internal cloud are deployed inside the firewall and managed by the user organization.
There is another type of cloud, hybrid cloud. A hybrid cloud environment consisting of multiple internal and/or external providers will be typical for most enterprises.
You will get more understanding here.
就像 Intranet 和 Internet 之间的区别一样。私有云是为特定团体或组织设置的云，通常与大的坏世界隔离（在防火墙等后面）。
公共云是公共的，在互联网上。
例如，我知道的某家大公司做云计算，但只使用他们控制的服务器。它为它们提供了与公共云计算相同的优势，但具有更多的控制权和更少的安全担忧。
他们也进行公共云计算，但他们不愿意让其他人随心所欲地控制或访问他们更宝贵的数据。
The same as the difference between an intranet and the internet. A private cloud is one set up for a specific group or organisation and usually isolated from the big bad world (behind firewalls and such).
A public cloud is, well, public, out on the internet proper.
For example, a certain big company I know does cloud computing but only using servers they control. It gives them the same benefits as public cloud computing but with more control and less security worries.
They also do public cloud computing but they wouldn't be comfortable to allow control or access to their more precious data to be at the whim of anyone else.
上面的答案对于 2010 年来说还不错，但是标准已经出现，NIST 也提出了公共云和私有云的实际定义（请参阅 NIST 云计算定义）NIST 定义如下，斜体是我的：
私有云。私有云可以通过组织喜欢的任何方式进行配置，包括内部网络或包含一些可供公众使用的机器的 DMZ。私有云可以解决公共云的嘈杂邻居问题 - 但是，根据基础设施的设置方式，您最终可能会成为自己的嘈杂邻居。
公共云。云基础设施供公众开放使用。它可能由以下人员拥有、管理和运营：
商业、学术或政府组织，或某种组合
其中。它存在于云提供商的场所。 很可能这就是每个人听到云时都会想到的，并使其几乎成为亚马逊的代名词，尽管他们只是不断增长的公共云提供商之一。
社区云。云基础设施的配置是为了
由组织中的特定消费者群体独家使用
有共同关注的问题（例如任务、安全要求、
政策和合规性考虑）。它可以被拥有、管理和
由社区中的一个或多个组织运营，
第三方，或它们的某种组合，它可能存在或不存在
前提。 这些可能是云领域的下一个繁荣，但遇到了营销问题。最近我看到它们作为私有云进行营销，但它们具有某些共同的优点，例如。可以在符合 HIPPA 的数据中心中配置符合 HIPPA 的云。
混合云。云基础设施由两个或多个组成
更独特的云基础设施（私有、社区或公共）
仍然是独特的实体，但通过标准化结合在一起
或支持数据和应用程序的专有技术
可移植性（例如，用于云之间负载平衡的云爆发）
The answers above were fine for 2010, however standards have since emerged and NIST has come out with actual definitions of public and private clouds (see NIST Cloud Computing Definitions) NIST definitions are belowm, the italics are mine:
Private cloud. The cloud infrastructure is provisioned for exclusive use by a single organization comprising multiple consumers
(e.g., business units). It may be owned, managed, and operated by the
organization, a third party, or some combination of them, and it may
exist on or off premises. A private cloud may be provisioned any way an organization may like, with internal networks or a DMZ with some machines available to the public. Private clouds can resolve the noisy neighbor issues of public clouds - however depending on how the infrastructure is set up, you might end up becoming your own noisy neighbor.
Public cloud. The cloud infrastructure is provisioned for open use by the general public. It may be owned, managed, and operated by
a business, academic, or government organization, or some combination
of them. It exists on the premises of the cloud provider. Quite possibly this is what everyone thinks of when they hear of Cloud, and make it almost synonymous with Amazon, although they are only 1 of the ever growing list of public cloud providers.
Community cloud. The cloud infrastructure is provisioned for
exclusive use by a specific community of consumers from organizations
that have shared concerns (e.g., mission, security requirements,
policy, and compliance considerations). It may be owned, managed, and
operated by one or more of the organizations in the community, a
third party, or some combination of them, and it may exist on or off
premises. These are probably the next boom in clouds, but suffer a marketing problem. Recently I've seen them marketed as private clouds, but they share certain benefits, eg. HIPPA compliant clouds can be provisioned in a HIPPA compliant data center.
Hybrid cloud. The cloud infrastructure is a composition of two or
more distinct cloud infrastructures (private, community, or public)
that remain unique entities, but are bound together by standardized
or proprietary technology that enables data and application
portability (e.g., cloud bursting for load balancing between clouds)
如果您谈论的是 IaaS？ （基础设施即服务）
公共云：示例：AWS、RackSpace、SkyTap 等等
所有这些都提供计算、存储、网络作为基础设施，具有多种选项和用例，以标准费用向公众提供服务。基础设施是别人家的，你根据自己的需要租用。
私有云：硬件服务器、机架、虚拟机管理程序、路由器、核心交换机和云管理软件。
以上所有内容都为您提供了最适合您需求的管理计算、存储、网络的方式。一切都是私有的 只有您根据自己的需要构建了这个私有云。您自己的家，您想要的方式，无需出租。
If you are talking about the IaaS ? (Infrastructure as a Service )
Public Cloud : Example : AWS,RackSpace,SkyTap and Many more
All of these provides computation,storage,networking as a Infrastructure with varied options and use cases, served for public with a standard fee. Somebody else home for Infrastructure, you rent it based on your need.
Private Cloud : Hardware Servers, Racks, Hypervisors,Router,Core Switch and Cloud Management Software.
All of the above provides you to manage the computation,storage,networking the way best fits to your need. Its all Private Its only you have built this Private Cloud for your own needs. Your own home the way you want, No rental.
添加到讨论中，公共云是由组织构建的，用于将计算作为服务出售给公众，而私有云是为了组织本身的计算目的（满足他们自己的需要）而构建的，
例如，Amazon EC2 或 Rackspace 数据中心可以是分类为公共云系统，Google 或 Facebook 数据中心可分类为私有云，区别在于构建它们的目的
Adding to the discussion, Public Clouds are built by organization for selling the computation as as service to the public where as Private Clouds are built for computation purposes of the organization itself(for their own need)
For example, Amazon EC2 or Rackspace DataCenters can be catagorized into Public Cloud systems and Google or Facebook DataCenters can be catagorized into Private Clouds, the difference being the purpose for which they are built
这一切都取决于谁对设备负责。
It all comes down to who has responsibility for the equipment.