Which solution will resolve the issue of failed access to the ECR repository?

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In: DOP-C02
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A company builds a container image in an AWS CodeBuild project by running Docker commands.After the container image is built, the CodeBuild project uploads the container image to an Amazon S3 bucket.The CodeBuild project has an IAM service role that has permissions to access the S3 bucket.A DevOps engineer needs to replace the S3 bucket with an Amazon Elastic Container Registry (Amazon ECR) repository to store the container images.The DevOps engineer creates an ECR private image repository in the same AWS Region of the CodeBuild project.The DevOps engineer adjusts the IAM service role with the permissions that are necessary to work with the new ECR repository.The DevOps engineer also places new repository information into the docker build command and the docker push command that are used in the buildspec.yml file.When the CodeBuild project runs a build job, the job fails when the job tries to access the ECR repository.

Which solution will resolve the issue of failed access to the ECR repository?

Update the buildspec.yml file to log in to the ECR repository by using the aws ecr get-login-password AWS CLI command to obtain an authentication token. Update the docker login command to use the authentication token to access the ECR repository.

Add an environment variable of type SECRETS_MANAGER to the CodeBuild project. In the environment variable, include the ARN of the CodeBuild project’s IAM service role. Update the buildspec.yml file to use the new environment variable to log in with the docker login command to access the ECR repository.

Update the ECR repository to be a public image repository. Add an ECR repository policy that allows the IAM service role to have access.

Update the buildspec.yml file to use the AWS CLI to assume the IAM service role for ECR operations. Add an ECR repository policy that allows the IAM service role to have access.

Explanations:

The AWS ECR repository requires authentication before pushing images. Theaws ecr get-login-passwordcommand is used to retrieve a Docker authentication token, which must then be used with thedocker logincommand to log in to the repository. Without this step, thedocker pushcommand will fail because the ECR repository expects an authenticated request.

Adding a SECRETS_MANAGER environment variable with the IAM service role ARN does not address the need for Docker authentication. The correct method is to use the AWS CLI to get a token withaws ecr get-login-passwordfor logging into ECR. Secrets Manager is not required in this case.

Changing the ECR repository to public would make the repository accessible without authentication. However, making a repository public is typically not desirable for private images due to security concerns, and does not address the issue of authentication needed for private repositories.

The IAM service role already has the required permissions to access the ECR repository. Assuming the IAM service role again via the AWS CLI is unnecessary and overly complicated. The main issue is logging in to the ECR repository, which can be done usingaws ecr get-login-password, not assuming the role again.

2026-03-22

2 Comments

  1. Richard
    Author

    In my opinion, the answer is:
    Update the buildspec.yml file to log in to the ECR repository by using the aws ecr get-login-password AWS CLI command to obtain an authentication token. Update the docker login command to use the authentication token to access the ECR repository.

  2. Cynthia
    Author

    As I see it, the answer is:
    Update the buildspec.yml file to log in to the ECR repository by using the aws ecr get-login-password AWS CLI command to obtain an authentication token. Update the docker login command to use the authentication token to access the ECR repository.

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