I can understand IaaS, PaaS and SaaS in cloud computing with a pizza.

You must have heard of the three "big" concepts in cloud computing: IaaS, PaaS, and SaaS. These terms are not well understood. However, if you are a foodie and like pizza, this problem will be solved! Well, in fact, you are not a foodie at all. The reason why you advertise yourself as a foodie is actually to praise the praise. "The food is still so thin, so envious!" Or, I have to find a decent place for the family. reason.

How does a "food" eat pizza?

Do it yourself at home

This is really a nuisance. You prepare a lot of things, make noodles, make dough, and go into the oven. . . . . Simply list it and you need everything shown below:

2. Buy a fast-food pizza and go home to eat.

You only need to buy the finished product from the pizza shop, go home and bake it, and eat it at your own table. Unlike yourself at home, you need a pizza vendor.

3. Calling a takeaway to bring the pizza to your home

Make a call and pizza is delivered to the door.

4. Eat pizza at the pizza shop

You don't need to prepare anything, even the table is also a pizza shop.

To sum up, you can eat pizza by eating the following ways:

Ok, now forget about pizza!

Suppose you are a super-X technology company, you don't need to provide services at all, you have infrastructure, applications, and so on. You divide them into three layers: infrastructure, platform, and software. Software), as shown below:

This is actually the three layers of cloud computing, the infrastructure is at the bottom, the platform is in the middle, and the software is at the top, which are Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS). , Software-as-a-Service (SaaS), other "soft" layers can be added above these layers.

And your company has everything, and the current state is called On-Premises, just like making pizza in your own home. A few years ago, if you wanted to run some enterprise applications on the office or on the company's website, you need to buy a server, or other high-level hardware to control the local application, and let your business run. This is called local deployment.

If your boss suddenly wants to understand one day, just to eat pizza, why do you have to do it yourself? So, prepare to consider a cloud service provider, what services can this cloud service provider provide? The cloud services it provides are three layers of cloud computing: IaaS, PaaS, and SaaS, just like the Pizza store offers three services: buy finished products, go home, takeaway, and eat at a pizza store.

This is shown by a picture.

Now let's talk about the specific details.

IaaS: Infrastructure-as-a-Service (Infrastructure as a Service)

With IaaS, you can outsource your hardware to other places. IaaS will provide off-site servers, storage and networking hardware that you can rent. Save on maintenance costs and office space, companies can use these hardware to run their applications at any time.

Some of the big IaaS companies include Amazon, Microsoft, VMWare, Rackspace and Red Hat. But these companies have their own expertise, such as Amazon and Microsoft offer you more than just IaaS, they will also lend their computing power to you. Host your website.

PaaS: Platform-as-a-Service (Platform as a Service)

The second layer is the so-called PaaS, sometimes called middleware. All of your company's development can be done at this level, saving time and resources.

PaaS offers a variety of solutions for developing and distributing applications, such as virtual servers and operating systems. This saves you money on hardware and makes it easier to work with dispersed studios. Web application management, application design, application web hosting, storage, security, and application development collaboration tools.

Some of the big PaaS providers are Google App Engine, Microsoft Azure, Force.com, Heroku, Engine Yard. Recently emerging companies include AppFog, Mendix and Standing Cloud

SaaS: Software-as-a-Service (Software as a Service)

The third layer is also called SaaS. This layer is a layer that comes into contact with your life every day, mostly through a web browser. Any application on a remote server can run over the network, which is SaaS.

The services you consume are all entered into these categories from web pages such as Netflix, MOG, Google Apps, Box.net, Dropbox or Apple's iCloud. Although these web services are used for business and entertainment or both, they are part of cloud technology.

Some SaaS applications for business include Citrix's GoToMeeTIng, Cisco's WebEx, Salesforce's CRM, ADP, Workday and SuccessFactors.

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