Docker buildx 401 Unauthorized exporting to image

General
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1

Hello,

I’m having an issue trying to do a docker buildx build and push to an ECR private repository. I created by buildx builder with:
docker buildx create --name mybuilder --driver docker-container --driver-opt image=moby/buildkit:v0.9.3 --platform linux/arm64,linux/amd64 --use

For my docker build I do:
docker buildx build --platform linux/arm64,linux/amd64 --no-cache --build-arg MYIMAGE=myimage -t my-repo:1.1.1 --push .
My build runs for about 10 min and eventually errors out after pushing layers with:

ERROR: unexpected status: 401 Unauthorized
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> exporting to image:
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error: failed to solve: unexpected status: 401 Unauthorized

Thought by supplying the --driver-opt image=moby/buildkit:v0.9.3 would fix this, but doesn’t look like it is working. Has anyone had any luck resolving this error? Any help would be greatly appreciated.

2

Have you used docker login to login to the ECR registry?

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The ECR authorization token received by aws ecr get-login-password --region $AWS_REGION | docker login --username AWS --password-stdin ${AWS_ACCOUNT_ID}.dkr.ecr.${AWS_REGION}.amazonaws.com expires after 12 hours. Also make sure your IAM user/role has the priviliges in place to push images and that the repo exists in your accounts private ECR registry.

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Thanks for the replies! So looks like how I was logging into ECR was the issue. Using aws ecr get-login-password | docker login works compared to what I was previously using which was aws ecr get-login. What’s strange though is that I’m using the aws ecr get-login with buildx in another project and it works fine. This particular project has a longer build time, but no where near 12 hours.

5

The only explaination I can see is that the old project used the aws-cli 1.x, while you current project uses aws-cli 2.x.
aws ecr get-login is deprecated since 1.17.10
aws ecr get-login-password is available in version 2 or in v1.17.10+