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Scaling AWS EC2 instances
I am looking for advice on this: I have a Windows Server 2008 R2 instance which is a single core instance. Is it possible to scale the server either up or down so that I have say a large(ie, 1GB of RAM) instance and a smaller(maybe 512MB) instance. I am trying to make the server as versatile as possible, so I would like to be able to scale it up or down based on the needs of the app(s) using the server.
I have looked at the documentation from Amazon, but I don't really understand how this can be done. Is it possible to do this? If so, how? I know this is a broad question, but I am thinking I need a good understanding of how EC2 works in order to have any kind of concrete answers.
Any and all help is greatly appreciated.
If you're using on-demand pricing (EC2's standard) you simply define the ratio (ratio being the number of instances that you want to have compared to the number of instances at full capacity).
Then you send a request to create instances, each receiving an allocation based on the ratio.
If you're using spot pricing (EC2's more expensive pricing model) you first need to create a reservation.
The reservation is the basis of the price you pay for these instances over the course of their lifetime. Spot instances are like a short term contract - they don't guarantee that the instance will always be available, and the cost is based on the actual spot price over the course of the instance's lifetime.
There are three parameters that affect the cost of these reservations:
The hour the instance stays running (reservations have an expiration time)
The number of instances you request
The size of the instance (how much memory)
The hourly price is an hourly fee based on spot instances
The number of reservations is the maximum number of instances that you can request
The size of an instance has an effect on the cost of a reservation. The smaller the instance, the cheaper the spot fee is.
If you want a more complex process, there are multiple ways to 0b46394aab