I want to know if possible what is the exact architecture of cloud computing and how does it work, i did not find articles that explain that. The second point of my question is that i want to know if there is a middleware layer in cloud computing architecture? if yes where is it situated and how does it work?
There are quite a lot of works about basic cloud architecture. Any survey might help....
Vaquero, L. M., Rodero-Merino, L., Caceres, J., & Lindner, M. (2008). A break in the clouds: towards a cloud definition. ACM SIGCOMM Computer Communication Review, 39(1), 50-55.
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https://www.ibm.com/developerworks/cloud/library/cl-cloudintro/
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Tsai, W. T., Sun, X., & Balasooriya, J. (2010, April). Service-oriented cloud computing architecture. In Information Technology: New Generations (ITNG), 2010 Seventh International Conference on (pp. 684-689). IEEE.
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All what you need to know as the very basic information is on SaaS, PaaS and IaaS in cloud. You will get the whole picture then
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And regarding your second question:
Depending on what you want to do, you may add middleware to PaaS or IaaS. Basically they are piece of code/components that you add to do some specific tasks. If that's what you mean ? Otherwise they are not part of the cloud architecture by default. Depending on your objectives, you add them where it is needed. You add them into different layers (where your main focus is) and you do the modifications at there so that you get to your objective. It is not something fixed to say X will always be sit in PaaS or Y will always apply in IaaS. You do the changes where needed. Hope that answers your question
Thank you Vahid Maleki Raee for your answer it is helpful, i worked on grid computing where the middleware layer was clear, now i start working on cloud computing. My work is especially focussed on security (access control mechanism). In grid computing, the middleware layer supports security mechanisms ( access control) but now i try to know how it is managed in cloud computing. According to your answer the middleware is not a fixed layer, it can exist as it can not so in this last case who manage security mechanisms?
Oh, I just got your point. I am not a security expert, so I can't really comment on that. Maybe it is better to add the point "security" in the question as well for clarity purposes so that those who can help can get your point. Because I was talking in very high level and in general. Perhaps those who are working on that domain can provide much better explanations.
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But what I can say, it is better to focus on each layer separately.
For example, we have IaaS provider and we do have PaaS provider.
These providers have their own security mechanisms for that layer. As I said, there is a detailed architecture for each layer. I think it is important to know which layer you will focus on.
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On the other hand, if you are asking on "who" takes care of security, in general, if it is a public cloud, of course the cloud provider and if it is private cloud, the enterprise/user himself will be having the full control over it. If that answers your question.
Thank you Vahid Maleki Raee for this clarification i will try to see PAAS and SAAS security management.
Best regards.
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