Cloud computing is a paradigm shift following the shift from mainframe to client–server  in the early 1980s. Details are abstracted from the users, who no longer have need for expertise in, or control over, the technology infrastructure "in the cloud" that supports them.Cloud computing describes a new supplement, consumption, and delivery model for IT services based on the Internet, and it typically involves over-the-Internet provision of dynamically scalable and often virtualized resources. It is a byproduct and consequence of the ease-of-access to remote computing sites provided by the Internet. This frequently takes the form of web-based tools or applications that users can access and use through a web browser as if it were a program installed locally on their own computer. NIST provides a somewhat more objective and specific definition here. The term "cloud" is used as a metaphor for the Internet, based on the cloud drawing used in the past to represent the telephone network, and later to depict the Internet in computer network diagrams as an abstraction of the underlying infrastructure it represents. Typical cloud computing providers deliver common business applications online that are accessed from another Web service or software like a Web browser, while the software and data are stored on servers. A key element of cloud computing is customization and the creation of a user-defined experience.

Migrating to a cloud infrastructure from your own legacy infrastructure can be a daunting task. There are more than two sozen cloud vendors ou there.

Netzary can provide you with the right strategy and platform, and has expertise in three platforms.

Amazon

Amazon Elastic Compute Cloud (EC2) is a central part of Amazon.com's cloud computing platform, Amazon Web Services (AWS). EC2 allows users to rent virtual computers on which to run their own computer applications. EC2 allows scalable deployment of applications by providing a web service through which a user can boot an Amazon Machine Image to create a virtual machine, which Amazon calls an "instance", containing any software desired.

Eucalyptus

Eucalyptus is a software platform for the implementation of private cloud computing on computer clusters. There are enterprise edition and open-source edition. Currently, it exports a user-facing interface that is compatible with the Amazon EC2 and S3  services but the platform is modularized so that it can support a set of different interfaces simultaneously. The development of Eucalyptus software is sponsored by Eucalyptus Systems, a venture-backed start-up [2] . Eucalyptus works with most currently available Linux distributions including Ubuntu, Red Hat Enterprise Linux (RHEL), CentOS, SUSE Linux Enterprise Server (SLES), OpenSUSE, Debian and Fedora. Similarly Eucalyptus can use a variety of virtualization technologies including VMware, Xen and KVM hypervisors  to implement the cloud abstractions it supports. Eucalyptus is an acronym for “Elastic Utility Computing Architecture for Linking Your Programs To Useful Systems”.

Google App Engine

Google App Engine is a platform for developing and hosting web applications in Google-managed data centers. 

Google App Engine is cloud computing technology. It virtualizes applications across multiple servers and data centers Other "cloud"-based platforms include offerings such as Amazon Web Services and Microsoft's Azure Services Platform. AppEngine differs from services like Amazon Web Services, though, in that AWS is Infrastructure as a Service while AppEngine is Platform as a Service.

Google App Engine is free up to a certain level of used resources. Fees are charged for additional storage, bandwidth, or CPU cycles required by the application

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