# uber/kraken

P2P Docker registry capable of distributing TBs of data in seconds

Repository: https://github.com/uber/kraken
Canonical: https://ross.abutalabs.com/products/kraken
Language: Go
License: Apache-2.0
License Family: permissive
Topics: docker, docker-registry, container, docker-image, p2p, bittorrent, containerd
Last push: 2026-08-26T14:49:16+00:00

## Health v2 (maintenance only)
Score: 97/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 92, longevity 100
- inputs: {"age_days": 2827, "days_push": 7, "days_rel": 58, "gap_med": 14, "n_releases_24m": 22}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 6737, forks 483 (observed 2026-08-28T04:09:48.206796+00:00)

## What it is
Kraken is a P2P-powered Docker registry from Uber that distributes container images and large blobs across clusters using BitTorrent-style peer-to-peer transfer. It scales to 15k+ hosts per cluster and plugs into existing blob storage backends like S3, GCS, and HDFS as a distribution layer.

## Use cases
- distribute docker images to thousands of hosts fast
- speed up container image pulls in a large kubernetes cluster
- p2p docker registry for hybrid cloud
- replicate container images across clusters
- avoid registry bandwidth bottlenecks when deploying large images
- self-hosted scalable docker registry

## When to choose
- you run large clusters (hundreds to thousands of hosts) pulling large images frequently
- your existing registry is a bandwidth bottleneck during deployments
- you need cross-cluster image replication with pluggable storage backends

## When to avoid
- small clusters or single-host setups where a plain registry suffices
- you want a simple managed solution without operating additional tracker/agent infrastructure
- you need OCI artifacts beyond container images without verifying compatibility

## Facets
- artifact type: service
- maturity: active
- function: p2p, object-storage, proxy, networking, self-hosted
- domain: microservices, cloud-computing
- platform: go, self-hosted, cloud
- tags: docker-registry, bittorrent, image-distribution, container-images, peer-to-peer, containers, devops, linux, docker

## Member repositories
- uber/kraken (main) score 97

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:48.206796+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 2026-08-29T17:42:40.132921+00:00, confidence not recorded.
  - readme: https://github.com/uber/kraken (fetched 2026-08-28T04:09:48.206796+00:00, sha 0fcf1a876bcb)
- Data as of 2026-08-30T08:39:29.467469+00:00.