Using --registry-mirror with Amazon ECR Public Gallery

[jpilch]

Hello,

I'm trying avoid Docker Hub rate limits by pulling base images from Amazon's Public ECR Gallery (https://gallery.ecr.aws). I know that Kaniko supports the --registry-mirror flag for using a Docker registry mirror, and I’m wondering if this flag can be used with public.ecr.aws.

So far I've tried setting the --registry-mirror flag like this

/kaniko/executor \
  --registry-mirror public.ecr.aws

and I would expect for e.g. alpine image to be pulled from the following url: public.ecr.aws/docker/library/alpine:latest
however I get the following error instead (seems like /v2 and /manifests paths are added to the url)

WARN[0001] Failed to retrieve image alpine: from remapped registry public.ecr.aws: unable to complete operation after 0 attempts, last error: GET https://public.ecr.aws/v2/library/alpine/manifests/latest: NAME_UNKNOWN: The repository with name 'alpine' does not exist in the registry with id 'library'. Will try with the next registry, or fallback to the original registry.

Is this a supported use case for --registry-mirror? If so, I would appreciate any advice on how to fix this issue.

Thanks a lot in advance!