docker - 如何使用 Docker Registry API V2 从私有(private)注册表中删除镜像？

Question

给定一个 Docker Registry在 localhost:5000，我如何使用 Docker Registry HTTP API V2和 curl删除具有以下 list header 和 list 的 busybox:latest:

derek@derekmahar-ubuntu-512mb-tor1-01:~/Projects/docker-registry$ curl --head --request GET http://localhost:5000/v2/busybox/manifests/latest
HTTP/1.1 200 OK
Content-Length: 2561
Content-Type: application/vnd.docker.distribution.manifest.v1+prettyjws
Docker-Content-Digest: sha256:e45f25b1760f616e65f106b424f4ef29185fbd80822255d79dabc73b8eb715ad
Docker-Distribution-Api-Version: registry/2.0
Etag: "sha256:e45f25b1760f616e65f106b424f4ef29185fbd80822255d79dabc73b8eb715ad"
X-Content-Type-Options: nosniff
Date: Wed, 04 May 2016 16:10:00 GMT

derek@derekmahar-ubuntu-512mb-tor1-01:~/Projects/docker-registry$ curl --request GET http://localhost:5000/v2/busybox/manifests/latest
{
   "schemaVersion": 1,
   "name": "busybox",
   "tag": "latest",
   "architecture": "amd64",
   "fsLayers": [
      {
         "blobSum": "sha256:a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4"
      },
      {
         "blobSum": "sha256:385e281300cc6d88bdd155e0931fbdfbb1801c2b0265340a40481ee2b733ae66"
      }
   ],
   "history": [
      {
         "v1Compatibility": "{\"architecture\":\"amd64\",\"config\":{\"Hostname\":\"156e10b83429\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":[\"sh\"],\"Image\":\"56ed16bd6310cca65920c653a9bb22de6b235990dcaa1742ff839867aed730e5\",\"Volumes\":null,\"WorkingDir\":\"\",\"Entrypoint\":null,\"OnBuild\":null,\"Labels\":{}},\"container\":\"5f8098ec29947b5bea80483cd3275008911ce87438fed628e34ec0c522665510\",\"container_config\":{\"Hostname\":\"156e10b83429\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":[\"/bin/sh\",\"-c\",\"#(nop) CMD [\\\"sh\\\"]\"],\"Image\":\"56ed16bd6310cca65920c653a9bb22de6b235990dcaa1742ff839867aed730e5\",\"Volumes\":null,\"WorkingDir\":\"\",\"Entrypoint\":null,\"OnBuild\":null,\"Labels\":{}},\"created\":\"2016-03-18T18:22:48.810791943Z\",\"docker_version\":\"1.9.1\",\"id\":\"437595becdebaaaf3a4fc3db02c59a980f955dee825c153308c670610bb694e1\",\"os\":\"linux\",\"parent\":\"920777304d1d5e337bc59877253e946f224df5aae64c72538672eb74637b3c9e\"}"
      },
      {
         "v1Compatibility": "{\"id\":\"920777304d1d5e337bc59877253e946f224df5aae64c72538672eb74637b3c9e\",\"created\":\"2016-03-18T18:22:48.262403239Z\",\"container_config\":{\"Cmd\":[\"/bin/sh -c #(nop) ADD file:47ca6e777c36a4cfffe3f918b64a445c8f32300deeb9dfa5cc47261bd7b75d21 in /\"]}}"
      }
   ],
   "signatures": [
      {
         "header": {
            "jwk": {
               "crv": "P-256",
               "kid": "RVEO:MXL3:ZYLW:BFGB:QAKI:SIKZ:JOVR:U7AP:2LGY:4SSF:MSV4:LND7",
               "kty": "EC",
               "x": "ZFyhNUInMwlVmFKzz-e-o_tzMd01ZdCj6LyGV4dnT5Y",
               "y": "3a0BcWa0h60tTGHYhUI4ziKisRk6b4JtvqbmL9kKy6E"
            },
            "alg": "ES256"
         },
         "signature": "BVWioJafWmMrUBBi9meRy9CUQYdsZgwkY01ipT1HInXofVXCIZmNMq7EFEl4A88pMZsf7DHZS2dyFeFjj-QP1Q",
         "protected": "eyJmb3JtYXRMZW5ndGgiOjE5MTQsImZvcm1hdFRhaWwiOiJDbjAiLCJ0aW1lIjoiMjAxNi0wNS0wNFQxNjoxMzo0M1oifQ"
      }
   ]
}

当我尝试 DELETE 图像摘要时，Docker Registry 提示“HTTP/1.1 404 Not Found”和“MANIFEST_UNKNOWN”:

derek@derekmahar-ubuntu-512mb-tor1-01:~/Projects/docker-registry$ curl --request DELETE http://localhost:5000/v2/busybox/manifests/sha256:e45f25b1760f616e65f106b424f4ef29185fbd80822255d79dabc73b8eb715ad
{"errors":[{"code":"MANIFEST_UNKNOWN","message":"manifest unknown"}]}

Answer 1

请注意:此 API 端点仅在更高版本的 v2 注册表中实现!

有一个内部 garbage collection删除注册表中图像的过程，但(还)不能通过 v2 注册表 API 访问。此功能看起来最近有很多 Action ，因此此信息可能会更改。

根据 API 规范，您必须获取图像摘要才能对其运行 DELETE。仔细阅读规范，并在请求正确的图像摘要时注意有关所需 header 的部分(“注意从 2.3 或更高版本的注册表中删除 list 时，在 HEAD 或 GET-ing list 时必须使用以下 header 来获取要删除的正确摘要:接受:application/vnd.docker.distribution.manifest.v2+json")

curl -v -u "user@example.com:passw0rd" -H "Accept: application/vnd.docker.distribution.manifest.v2+json" -X HEAD https://registry.example.com/v2/derek/busybox/manifests/latest

当您这样做时，您将特别注意 Docker-Content-Digest header 。在您的特定请求中，完整的 header 如下所示:

Docker-Content-Digest: sha256:e45f25b1760f616e65f106b424f4ef29185fbd80822255d79dabc73b8eb715ad

现在有了该摘要，您应该能够将其插入the API 所描述的格式中。你链接:

DELETE /v2/<name>/manifests/<reference>

并使用我上面使用的示例，但根据您的摘要， curl 看起来像这样:

curl -u "user@example.com:passw0rd" -X DELETE https://registry.example.com/v2/derek/busybox/manifests/sha256:e45f25b1760f616e65f106b424f4ef29185fbd80822255d79dabc73b8eb715ad

然后你应该得到一个202 Accepted响应码，表示删除成功。

您也可以尝试 this gist 中的短脚本:

registry='localhost:5000'
name='my-image'
curl -v -sSL -X DELETE "http://${registry}/v2/${name}/manifests/$(
    curl -sSL -I \
        -H "Accept: application/vnd.docker.distribution.manifest.v2+json" \
        "http://${registry}/v2/${name}/manifests/$(
            curl -sSL "http://${registry}/v2/${name}/tags/list" | jq -r '.tags[0]'
        )" \
    | awk '$1 == "Docker-Content-Digest:" { print $2 }' \
    | tr -d $'\r' \
)"