Talk:Cloud computing/Draft Layers: Difference between revisions

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In the PaaS model, cloud providers deliver a [[computing platform]] and/or [[solution stack]] typically including operating system, programming language execution environment, database, and web server. Application developers can develop and run their software solutions on a cloud platform without the cost and complexity of buying and managing the underlying hardware and software layers. With some PaaS offers, the underlying compute and storage resources scale automatically to match application demand such that the cloud user does not have to allocate resources manually.

=== Software as a Service (SaaS) ===

{{Main|Software as a Service}}

In this model, cloud providers install and operate [[application software]] in the cloud and cloud users access the software from [[cloud clients]]. The cloud users do not manage the cloud infrastructure and platform on which the application is running. This eliminates the need to install and run the application on the cloud user's own computers simplifying maintenance and support. What makes a cloud application different from other applications is its [[elasticity]]. This can be achieved by cloning tasks onto multiple [[virtual machines]] at run-time to meet the changing work demand. [[Load balancer]]s distribute the work over the set of virtual machines. This process is transparent to the cloud user who sees only a single access point. To accomodate a large number of cloud users, cloud applications can be [[multitenant]], that is, any machine serves more than one cloud user organization. It is common to refer to special types of cloud based application software with a similar naming convention: [[desktop as a service]], business process as a service, [[test environment as a service]], [[communication as a service]].

The pricing model for SaaS applications is typically a monthly or yearly flat fee per user.<ref name="Chou">

Cloud applications have a pricing model that is based on different compute and storage usage, and tenancy metrics.<ref name="hamdaqa"> Mohammad Hamdaqa, Tassos Livogiannis, Ladan Tahvildari: A Reference Model for Developing Cloud Applications. CLOSER 2011: 98-103</ref> ''Need more facts about pricing''

{{cite book

|title = Introduction to Cloud Computing: Business & Technology

<!-- removed SOA discussion - SOA is not even in the main SaaS article -->

|first = Timothy

|last = Chou

|url = http://www.scribd.com/doc/64699897/Introduction-to-Cloud-Computing-Business-and-Technology

}}

</ref>

== Cloud clients ==

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}}

</ref>

{{Reflist|30em}}