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Asked: 2026-06-09T17:23:08+00:00

I am trying to create an Amazon EC2 instance. I want to create a

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I am trying to create an Amazon EC2 instance. I want to create a micro, 64-bit, Ubuntu 12.04 LTS instance.

In Amazon Web Services I have seen all instance have AMI numbers. Now I found two ami(s) with numbers ami-8a7f3ed8 and ami-b8a8e9ea. both looks same to me – micro, ebs-based, 64-bit Ubuntu 12.04LTS images.

If so, what is the difference and why two number for the same machine image?

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  1. Editorial Team

    When selecting an AMI, select from a trusted source.

    The AMI number is just a unique identifier for a particular image that someone published. The title (e.g. Ubuntu 12.04LTS) is just a claim by the person who published the AMI about what is on it.

    If you get your AMI from a source that is not known to be trustworthy, it could potentially contain built-in security holes, pre-installed spam relays, etc.

    From Amazon

    You launch AMIs at your own risk. Amazon cannot vouch for the integrity or security of AMIs shared by other EC2 users. Therefore, you should treat shared AMIs as you would any foreign code that you might consider deploying in your own data center and perform the appropriate due diligence.

    Ideally, you should get the AMI ID from a trusted source (a web site, another EC2 user, etc). If you do not know the source of an AMI, we recommend that you search the forums for comments on the AMI before launching it. Conversely, if you have questions or observations about a shared AMI, feel free to use the AWS forums to ask or comment.

    Amazon’s public images have an aliased owner and display amazon in the userId field. This allows you to find Amazon’s public images easily.

    http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/AESDG-chapter-usingsharedamis.html#usingsharedamis-security

    Personally I select AMIs published well-known entities like Amazon or RighScale.

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