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I'm trying to download ECR images on my EC2 instance without having to provide a credentials file. So I created a role with the policy AmazonEC2ContainerRegistryReadOnly and attached to my running instance. However, when I run aws ecr describe-repositories --region us-east-2, I get the following error:

Unable to locate credentials. You can configure credentials by running "aws configure".

I'm not sure if attaching the role to the instance is sufficient, but I already tried to restart the instance and it still doesn't work.

Here's some screenshots from the AWS Console that may help find the problem:

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    are you sure your aws cli is configured correctly?
    – c4f4t0r
    Sep 23 at 0:30
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    @c4f4t0r: There was no configuration file (I didn't created one and the instances comes without one). I launched a new instance and it worked. I compared the versions and it was the same, but they both was at version 1. I upgraded AWS cli on the old machine and it worked, no idea why. Thanks for helping out.
    – rodorgas
    Sep 23 at 2:59

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Reinstalling/upgrading AWS cli made it work.

The AWS cli was at version 1, after upgrading to version 2 it worked. Before that, I launched a new EC2 instance (Amazon Linux 2) with the attached role and it worked at AWS cli version 1, the exact same of the old machine.

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