Bootstrap FreeKB - Amazon Web Services (AWS) - Getting Started with EC2 Spot Instances
Amazon Web Services (AWS) - Getting Started with EC2 Spot Instances


At a high level, there are 3 types of EC2 instances

Here are the main differences between a spot instance and on-demand instances.

On-Demand Spot
Always available Only available when capacity is available
More expensive than Spot Significantly less expensive than on-demand

 

Since Spot Instances are only available when there is capacity available, which is something determined by AWS, these of course wouldn't be used for something that must always be available, such as an EC2 instance running a customer facing web application. However, a good use case for a spot instance is some type of infrequent batch processing job, perhaps some some that just needs to run once a week, at any time.

To get started, in the left panel of the EC2 console, select Spot Requests > Request Spot Instances and then complete the form to specify the number of EC2 spot instances you would like to request.

 




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