amazon web services - Small instance and autoscale or big instance? -

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I'm going to get an Amazon EC2 account for my 4 e-commerce websites. Sometimes there is a big traffic, or I have to ask several questions to generate some product feeds. But there is something that I can not understand about this system: Why are different examples specs? I mean, if I pay per hour, why do not I get the smallest example, and if necessary give 2 or 100 examples to deal with auto-scale traffic. So, what advice can be made or why I am told above or not? And why is the different example size? Thank you all

Not all applications are the same, the number of these web applications is quite different, the basic form From Amazon, AWS offers various flavors of virtual servers, some candidates are best suited for bursts, low-use blogs, compute intensive apps, e-commerce websites for media streaming servers, which require high RAM etc.

You start with the most appropriate type and size to scale your application based on the virtual server and load then scale and scale down. A.W.S. Locasti, Scalable and Fault tolerant provides contextual-case and best practices for web services architect.


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