# AliyunContainerService/image-syncer

Docker image synchronization tool for Docker Registry V2 based services

Repository: https://github.com/AliyunContainerService/image-syncer
Canonical: https://ross.abutalabs.com/products/image-syncer
Language: Go
License: Apache-2.0
License Family: permissive
Topics: docker-registry, docker-image, harbor, docker, dockerhub, acr, dockerhub-image, cicd
Last push: 2025-02-05T07:40:34+00:00

## Health v2 (maintenance only)
Score: 25/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 5, release rhythm 8, longevity 100
- inputs: {"age_days": 2515, "days_push": 574, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1020, forks 282 (observed 2026-08-28T04:03:15.486248+00:00)

## What it is
A Go CLI tool that synchronizes Docker images between registries supporting Docker Registry V2, such as Docker Hub, Quay.io, Harbor, and Alibaba Cloud ACR. It performs fast, memory-only, incremental many-to-many syncs without requiring a Docker daemon.

## Use cases
- sync docker images between registries
- mirror images from docker hub to aliyun acr
- copy container images to harbor
- bulk migrate docker images to a private registry
- incremental image synchronization in ci pipeline
- replicate images across multiple registries

## When to choose
- you need many-to-many image replication across V2-compatible registries
- you want fast sync without disk storage or a Docker daemon
- you need automatic retries and incremental sync for CI/CD image mirroring

## When to avoid
- your registries do not implement Docker Registry V2
- you need full image building or scanning, not just syncing
- you prefer a GUI-based registry management tool

## Facets
- artifact type: cli-tool
- maturity: active
- function: developer-tools, deployment, ci-cd, container-runtime
- domain: cloud-computing
- platform: windows, cli, go
- tags: docker-registry, image-sync, harbor, docker-hub, container-registry, mirror-images, devops, containers, automation, linux, macos, docker

## Member repositories
- AliyunContainerService/image-syncer (main) score 25

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:15.486248+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:08:53.005905+00:00, confidence not recorded.
  - readme: https://github.com/AliyunContainerService/image-syncer (fetched 2026-08-28T04:03:15.486248+00:00, sha 9c6f4529b060)
- Data as of 2026-08-30T08:39:29.467469+00:00.