原创 花絮3 云服务三层架构 Cloud 3 Layer

我们经常到大型商场买日用品。一个商场，首先要有一个建筑物，摩天大楼或者地下广场，有对应的水、电、空调等配套设施，这主要是为商铺入驻服务的；然后要有运营服务机构，招商入驻，同时提供保洁、安全等服务配套，这主要是为商铺入驻服务的；最后是各商铺或专卖店，通过各自不同的产品或服务吸引消费者。

We often buy daily necessities in large mall. A mall must have a building first, a skyscraper or an underground plaza, and there are basic facilities such as water, electricity, air conditioning, etc., which are serve for the shops mainly; then there must be an operation service agency, attracting shops, and providing cleaning, security and other services,; Finally, there must have kinds of shops who attract consumer with different products or services.

我们经常使用电脑，首先要有电脑，包括主机、屏幕、键盘、鼠标等，我们习惯称之为硬件；然后需要有操作系统，就是windows；再然后我们使用软件，上网用浏览器，写文件用word等。

We often use computer which includes case, screens，keyboards，mice, etc. We are used to calling it hardware; then we need an operating system, which is windows; then we use different software, use the browser to visit web, use word to write file and so on.

上述两个不同的例子其中有很多相似的地方，首先需要有基本设施，然后需要有充分管理使用基本设施的工具，形成一个可通用的平台，进而，提供个性化的服务。

There are many similarities in the two different examples above. There is a need for basic facilities first, and then tools are used that manage the infrastructure to form a universal platform, therefore provide personalized services.

云平台同样如此，基础设施即服务IAAS、平台即服务PAAS、软件即服务SAAS组成了云平台的三层架构。

It is same as the cloud platform. Infrastructure-as-a-service IAAS, Platform-as-a-service PAAS, and Software-as-a-service SAAS form the three-tier architecture of the cloud platform.

Fig prifix3.1 Cloud 3 layer