Can we validate if same name AMI is present on AWS, before creating new one from Packer ?

[Akhilesh Verma]

Hi ,

I am using packer to create an image on aws. But now I am thinking to build a custom image with same addon packages should be skipped.

I am using digest from addon packages to generate ami name. so if same addon packages are applied on same Base OS image, then packer should skip due to image is already present there.

Is there any options available in packer to achieve this?

Thanks,

Akhilesh Verma

[Wilken Rivera]

Akhilesh,

There is no skip build if AMI already exist. Packer validates the name of the AMI (as defined in  ami_name) before initiating the creation step. If it finds an existing AMI with the same name it will error indicating that the name is already in use by an existing AMI.

AMI names must be unique so prevalidation is always performed unless one of the following configuration parameters are set "force_deregister" or "skip_build_region", which skips the AMI name validation step.

Are you seeing a different behavior? If so, you may want to check if the build configuration contains any of the two parameters that would cause the build to skip the validation step. Or if there are any slight variations in the digest being used for the AMI names. 

Wilken

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[Akhilesh Verma]

Thanks, Wilken

I was using "force_deregister", it works once I removed it.

-Akhilesh Verma

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