Although there are 3 different EC2 instance purchasing options, you can only manually control whether you launch an On-Demand or Spot Instance.
Although Reserved Instances are manually purchased from Amazon, it is Amazon, not you, who determines whether your On-Demand instances should be billed at the discounted Reserve Instance price or at the standard On-Demand Instance price. As a user, you can only control whether or not you are launching an On-Demand or Spot Instance.
By default, all servers will be configured to launch On-Demand Instance types unless you overwrite this preference at the server level. Once a server has been added to a deployment, you can select "Spot" as the instance type under a server's Info tab. Click Edit. If you want to launch a "Spot" instance type, you will also need to define the Maximum Bid Price. Use the "history" link to view recent changes to the current spot price.
Note: Amazon typically changes the spots randomly throughout the day.
Note: Spot Instances do not support start/stop functionality. Click here for more information.
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