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.
私有云是指為通過Internet或專用內部網路提供的計算服務,它僅針對于選定用戶而不是一般大眾，它也被稱為內部云或者企業云，私有云計算為企業提供了公有云的許多好處(包括自助服務，可擴展性和彈性),它通過專用資源提供了額外的控制和定制能力，遠勝于托管在本地的計算基礎機構，另外，私有云通過公司防火墻和內部托管提供更高級別的安全和隱私，確保第三方提供商無法訪問操作和敏感資料，其中一個缺點是公司IT部門需要承擔管理私有云的成本和責任，因此，私有云需要與傳統資料中心所有權相同的人員配備、管理和維護費用，
私有云可提供兩種模型的云服務，第一種是基礎結構即服務 (IaaS)，它允許公司使用基礎結構資源，如計算、網路和存盤，第二種是平臺即服務 (PaaS)，它允許公司提供一切，小到基于云的簡單應用程式，大到復雜的企業應用程式，私有云也可以和公有云結合創建混合云，允許企業利用云爆發釋放更多空間并在計算需求增加時將計算服務擴展到公有云，
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