Explain the architecture of Cloud computing in detail.

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 Architecture of Cloud computing

  • Cloud computing is utility-oriented and Internet Centric way of delivering IT services on demand.
  • cloud computing architecture includes 

i) infrastructure as a service

i)platform as service

 iii) software as a service





From the figure above, we will discuss

i) infrastructure as a service

ii)platform as service

iii) software as a service 

iv) user-level middleware

v) User application 

vi) core middleware

vii) system infrastructure.


1. IAAS

It provides access to fundamental resources such as physical machines, virtual machines, virtual storage, etc.

Characteristics:

  • virtual machines with pre-install s/w
  • virtual machines with preinstall os 
  • on-demand availability of resources
  • Allow copying of the particular data at different locations.
  • resources can be easily scaled up and down.


2. PAAS: 

  • platform as a service offers the runtime environment for the application. It offers development and deployment tools
  • Required to develop the application.

characteristics:

  • pass offers a browser-based development environment. 
  •  provides built-in security, scalability, and web services.
  • provides built-in fools for defining workflow, approval process, and business values.
  • easy to integrate with other applications some platform 
  • provides a web services interface to connect applications outside the platform.


3. SAAS

Allows providing s/w application as a service to the end users. software is deployed on the host service and is accessible via the internet.

characteristics :

  • software available on the internet
  • Software applications are maintained by vendors
  •  License to s/w may be sup subscription based.
  • It is cost-effective 
  • Available on demand.


4. User applications :

  • It includes cloud applications through which endures get interact
  • there may be a different application like scientific, gaming
  •  eg: Gmail, facebook.com, etc.


5. user-level middleware

  • includes cloud application programming environment and tools
  • different types of programming and tools depend on user application
  • eg web2.0, libraries, scripting, etc.


6. Core middleware 

  • It includes cloud hosting platforms.
  • It manages the quality of services.
  • It executes management.


7. System infrastructure 

  • It includes cloud resources.
  • It store hardware, software.
  • Database, and services are part of it.

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