The private cloud is defined as computing services offered either over the Internet or a private internal network and only to select users instead of the general public. Also called an internal or corporate cloud, private cloud computing gives businesses many of the benefits of a public cloud - including self-service, scalability, and elasticity - with the additional control and customization available from dedicated resources over a computing infrastructure hosted on-premises. In addition, private clouds deliver a higher level of security and privacy through both company firewalls and internal hosting to ensure operations and sensitive data are not accessible to third-party providers. One drawback is that the company’s IT department is held responsible for the cost and accountability of managing the private cloud. So private clouds require the same staffing, management, and maintenance expenses as traditional datacenter ownership.
Two models for cloud services can be delivered in a private cloud. The first is infrastructure as a service (IaaS) that allows a company to use infrastructure resources such as compute, network, and storage as a service. The second is platform as a service (PaaS) that lets a company deliver everything from simple cloud-based applications to sophisticated-enabled enterprise applications. Private clouds can also be combined with public clouds to create a hybrid cloud, allowing the business to take advantage of cloud bursting to free up more space and scale computing services to the public cloud when computing demand increases.
私有云是指为通过Internet或专用内部网络提供的计算服务,它仅针对于选定用户而不是一般大众。它也被称为内部云或者企业云，私有云计算为企业提供了公有云的许多好处(包括自助服务，可扩展性和弹性),它通过专用资源提供了额外的控制和定制能力，远胜于托管在本地的计算基础机构。另外，私有云通过公司防火墙和内部托管提供更高级别的安全和隐私，确保第三方提供商无法访问操作和敏感数据。其中一个缺点是公司IT部门需要承担管理私有云的成本和责任。因此，私有云需要与传统数据中心所有权相同的人员配备、管理和维护费用。
私有云可提供两种模型的云服务。第一种是基础结构即服务 (IaaS)，它允许公司使用基础结构资源，如计算、网络和存储。第二种是平台即服务 (PaaS)，它允许公司提供一切，小到基于云的简单应用程序，大到复杂的企业应用程序。私有云也可以和公有云结合创建混合云，允许企业利用云爆发释放更多空间并在计算需求增加时将计算服务扩展到公有云。
文章来源: 博客园
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