DaoCloud/public-image-mirror

Public Image Mirror is a container registry proxy service designed to cache remote container images locally. By intercepting image pull requests and serving content from internal storage, it reduces dependency on external registry availability and minimizes external bandwidth consumption.

The service implements standard container registry protocols, allowing existing container runtimes to interact with the cache as if it were a native registry. It utilizes a content-addressable storage layer to manage image layers as immutable blobs, ensuring data integrity and deduplication while resolving manifests to fetch and assemble layers from remote sources.

This tool supports operational workflows such as build pipeline optimization and the maintenance of offline development environments. It performs asynchronous mirroring to ensure images are available locally without blocking initial client requests, providing a consistent interface for managing image availability across infrastructure.