amazon-ec2 - Amazon EC2 预留实例能否与 AWS Elastic Beanstalk 中的自动扩展一起使用？

Question

据我了解，AWS Elastic Beanstalk 将允许您设置自动扩展，这意味着您可以在夜间使用微实例，并在白天自动扩展。如果您这样做，您仍然可以利用预留 EC2 实例定价吗？

Answer 1

更新(2013 年 9 月)

AWS 刚刚宣布支持 Modify EC2 Reserved Instance Reservations ，这消除了之前的两个限制(我相应地更新了我的初始答案):

Today we are making the Reserved Instance model even more flexible by giving you the power to modify your Reserved Instances (RI's) when your needs change. You can now move your RI's between Availability Zones as long as you stay within the same Region. If your AWS account is enabled for EC2-Classic, you can also move your RI's between EC2-Classic and EC2-VPC. You can now make adjustments to your Reserved Instances as your needs and your architecture change.

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初始答案(已更新)

Can you still take advantage of reserved EC2 instance pricing if you do this?

当然，Amazon EC2预留实例计费和使用情况的处理是透明的，即，只要您有按类型、区域和可用区与正在运行的实例相匹配的预留实例，AWS 就会简单地应用您的预留实例定价，请参阅以下常见问题解答以了解详细信息:

• How do I control which instances are billed at the Reserved Instance rate?
  RunInstances 命令不区分按需实例和预留实例。在计算您的账单时，我们的系统会自动优化哪些实例按较低的预留实例费率收费，以确保您始终支付最低的金额。

请注意有关如何匹配此虚拟池中的实例的限制，例如:

• Can a Reserved Instance that I’ve bought for a particular instance type (i.e. High-CPU Extra Large Instance) be applied to a different instance type that I am running (i.e. Standard Large Instance)?
  不可以。每个预留实例都与特定实例类型相关联，并且只能在预留实例期限内应用于该实例类型。

• Can I move a Reserved Instance from one Region to another?
  否。每个预留实例都与一个特定区域相关联，该区域在预留实例的生命周期内是固定的且无法更改。

• Do I need to specify an Availability Zone when I launch my instances in order to take advantage of my Reserved Instances?
  是的。当您购买预留实例时，您可以指定要在其中预留该实例的可用区。为了使用该预留实例，您需要确保在同一可用区中启动您的实例。 [...]

在启动实例时没有明确指定可用区时，后者很容易被忽视，这将依次产生一个随机的可用区。