Description of cloud computing at different levels

"Virtual Wisdom: VMware vsphere" 1th chapter of the purpose and nature of enterprise virtualization, the focus of this chapter is the basic knowledge of virtualization, but also the current and virtualization of the most relevant cloud computing technology, this section for you to introduce the different levels of cloud computing instructions.

Different levels of application have different levels of means, but basically cloud computing will not leave the previous few keywords, we are in this section to look at several well-known cloud computing.

1. Software as a service

The best known of software services is Flickr. This is a photo-sharing service, in the paid part, and then shows its use of cloud traces.

Flickr's cloud computing

Quantification: The number of photos (disk space) and the amount of traffic (network bandwidth) transmitted per month as the basis for its "quantification".

Many: photos on different servers (such as FARM3, FARM5, etc.), matching the "many" conditions.

Resources: Flickr is a Web service, of course, with cpu/ram/Network/storage resources.

Web: Flickr is a network of services, including direct browsing and code connectivity.

Interface: Flickr uses browsers and browsers for its interface.

Users: Flickr allows people to view photos through the browser, or through HTML code that allows them to embed images, serving objects including human and Web pages.

2. Platform is the service part

In the Platform as A Service section, the best example is the SimpleDB in Amazon AWS or Google's bigtable. First, define platform as a whole service, such as database services, Web services, and so on. Amazon's simpledb is the standard database Platform as A Service.

Amazon's SimpleDB is a database of Web interface, new/modified/deleted/query of general database can be implemented on Web page, also can run SQL statement. SimpleDB is the architecture in a cloud service called the Amazon Relational database service (ARDS, Amazon Relational DB service), users can create a new database at any time, and can allocate resources (such as CPU, memory, etc.) to the database. The most standard platform is the service.

(Click to view larger image) ▲amazon's Ards is also a well-known PAAs architecture

"Amazon relational database Services cloud computing

Quantification: The size of the database and the Cpu/ram resources used.

Many: the host that the database is placed can make cluster, support multiple host.

Resources: The service you are in is a Web service, and of course there are resources such as cpu/ram/network/storage.

Network: Services through the network, including direct browsing and code connectivity.

Interface: The operation interface uses the browser, the browser for its interface.

User: You can make the database available to humans through a browser, or you can use SQL code to let other services access the database.

3. Architecture as Service

Amazon dropped a bomb in the information industry in 2006, known as the EC2 service. EC2 the CPU, RAM, storage space and network delivery speed to add the shell into the product, so that users can create their own host through the Web card, and can choose the operating system, in this operating system to install their own services. For example, you can create three hosts through a Web page, Linux, Windows 2003, and Windows 2008, and install their own services, operating on a remote desktop, as if they were working on their own computers, which can be generated at any time, with unlimited number of Not limited to performance, can be given a number of CPUs, a large amount of RAM and scalable storage space, can also determine the number and speed of the network card, which is the standard of the architecture as a part of the service, this book is the virtualization of this part.

▲ In addition to EC2, Vcloud Express is a VMware vsphere-oriented IaaS

Small common sense

The

Amazon's EC2 hosts are virtual machines that are built using Xen.