Amazon ECR announces ECR to ECR pull through cache

Amazon ECR announces ECR to ECR pull through cache, a capability that allows customers to automatically sync container images between two ECR private registries, existing across AWS regions and/or accounts. This enables customers to benefit from the reduced latency of pulling cached images in-region. With today’s release, Amazon ECR makes it easier for customers to optimize storage costs by providing a simple and reliable way to store local copies of only the images that are pulled across regions/accounts.

As customers grow, they often have container deployments spread across multiple AWS regions. Storing images within the region of deployment improves application start-up times due to lower latency of in-region pulls. To achieve this, customers have to maintain copies of all images in every region, which is not cost-effective as many of these images are not deployed. ECR to ECR pull through cache allows customers to sync images between ECR registries in a cost-effective way by caching only the images that are pulled. Customers can now push images to their primary registry and configure pull through cache rules to cache images into downstream registries. On an image pull, ECR automatically fetches the image from upstream registry, and caches it into an automatically created repository in downstream registry for future pulls. Additionally, this feature supports frequent syncs with upstream, helping keep the cached images up to date.

ECR to ECR Pull through cache is available in all AWS regions, excluding GovCloud (US) and China regions. To learn more, please visit our user guide.