Instance ID uniqueness

I would like to get some clarifications on the uniqueness of Instance IDs. From the docs (https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/resource-ids.html) it says: "we assign each resource a unique resource ID."

I just want to clarify the following:

If an instance is terminated, can that Instance ID be used again in the same AWS account?
Are Instance IDs unique across all regions in the same AWS account?

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idris

已提問 1 年前檢視次數 794 次

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Instance IDs are uniquely generated globally, which means for every region and for every account, and are unable to be reused again. So to answer your questions specifically:

No, that same ID cannot be used again.
Yes, and even across all accounts.

Lawrence Aiello

已回答 1 年前

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Jonathan_D

已審閱 1 年前

idris
1 年前
Great, thank you for clarifying
Danish Tamboli 支援工程師
14 天前
Just curious. How does the service(Not just for Instances and not just EC2) manage to create a globally unique IDs every single time?

Lets say there's a small service somewhere doing this job of generating IDs that are unique. Does this service have to look at all the previously used IDs before returning a new one? If Yes, how does it do this so fast? OR Does it simply apply some transformations to a set of known values such as [AccountID, Region, CreationTimestamp, etc.] and hope for the output to be globally unique? OR Is there some other magic happening. (PS: I have no experience with development)

Instance ID uniqueness

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