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doc: add documentation for comparison with well-known registries

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Add COMPARISON.md

Signed-off-by: Ramkumar Chinchani <rchincha@cisco.com>
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Ramkumar Chinchani 2021-09-20 17:13:43 +00:00 committed by Ramkumar Chinchani
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# Why zot?
A comparison between various registries and their capabilities with respect to zot.
Please see [documentation](./examples/README.md) for various configuration options.
## [docker distribution](https://github.com/distribution/distribution)
| | docker distribution | zot |
|---|---|---|
| **Last stable release** | v2.7.1 (Jan 17, 2019) | v1.3.0 (Sep 1, 2021) |
| **License** | Apache 2.0 | Apache 2.0 |
| **On-premise deployment** | yes | yes |
| **Minimal build*** | no | yes |
| **Storage Layout** | project-specific layout [1] | ociv1 image layout [2] |
| **Authentication** | auxiliary [3] | built-in |
| **Authorization** | auxiliary [3] | built-in |
| **Garbage collection** | requires server shutdown | inline |
| **Storage deduplication** | none | inline |
| **Cloud storage support** | yes | yes |
| **Delete by tag** | unsupported [4],[5] | yes |
| **Vulnerability scanning** | none | built-in |
| **cli** | yes | yes |
| **ui** | auxiliary [3],[4] | yes [8] |
| **External contributions** | yes | yes |
| **CNCF project** | yes [9] | no |
* NOTE: "minimal build" criterion above means the ability to build a minimal
distribution-spec compliant registry in order to reduce library dependencies
and the possible attack surface.
# References
[1] https://github.com/distribution/distribution/tree/main/registry/storage
[2] https://github.com/opencontainers/image-spec
[3] https://github.com/cesanta/docker_auth
[4] https://github.com/distribution/distribution/issues/3234
[5] https://github.com/distribution/distribution/issues/2747
[6] https://github.com/Joxit/docker-registry-ui
[7] https://github.com/parabuzzle/craneoperator
[8] https://github.com/anuvu/zot-ui
[9] https://www.docker.com/blog/donating-docker-distribution-to-the-cncf/

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* ```go get -u github.com/anuvu/zot/cmd/zot```
(**Why zot?**)[CONFORMANCE.md]
# Presentations
* [OCI Weekly Discussion - Oct 2, 2019](https://hackmd.io/El8Dd2xrTlCaCG59ns5cwg#October-2-2019)