给定一个标签 `latest`,我们想在 Docker Hub 上找出另一个具有相同镜像 ID 的标签。
这里是如何使用 Docker Hub API v2 找出 repo 的所有标签:
TOKEN=$(curl -s -H "Content-Type: application/json" -X POST -d '{"username": "'${UNAME}'", "password": "'${UPASS}'"}' https://hub.docker.com/v2/users/login/ | jq -r .token)
curl -s -H "Authorization: JWT ${TOKEN}" https://hub.docker.com/v2/repositories/fluent/fluentd/tags/?page_size=100 | jq
不幸的是,它不包含图像 ID,但该键始终为 `null` 值:
$ curl -s -H "Authorization: JWT ${TOKEN}" https://hub.docker.com/v2/repositories/fluent/fluentd/tags/?page_size=100 | jq
{
"count": 36,
"next": null,
"previous": null,
"results": [
...
{
"name": "v0.14.11",
"full_size": 11964464,
"id": 7084687,
"repository": 219785,
"creator": 2923,
"last_updater": 2923,
"last_updated": "2016-12-27T07:16:41.294807Z",
"image_id": null,
"v2": true,
"platforms": [
5
]
},
...
很遗憾,图片 ID 与上述 JSON 中的 `id` 不同。
$ docker images | grep fluent
docker.io/fluent/fluentd v0.14.11 1441d57beff9 3 weeks ago 38.25 MB
理论上,应该可以通过此 Docker Registry 调用访问 Docker Manifests 和镜像 ID,但它也无济于事:
$ curl -s -H "Authorization: JWT ${TOKEN}" "https://registry.hub.docker.com/v2/fluent/fluentd/manifests/latest"
{"errors":[{"code":"UNAUTHORIZED","message":"authentication required","detail":[{"Type":"repository","Name":"fluent/fluentd","Action":"pull"}]}]}
这里是 Docker GitHub 存储库中的一个类似问题,但我仍然无法找出解决方案:https://github.com/docker/distribution/issues/1490 .
P.S.:这是我尝试推送测试镜像的 Docker 版本:
$ docker version
Client:
Version: 1.12.6
API version: 1.24
Package version: docker-common-1.12.6-5.git037a2f5.fc25.x86_64
Go version: go1.7.4
Git commit: 037a2f5/1.12.6
Built: Wed Jan 18 12:11:29 2017
OS/Arch: linux/amd64
最佳答案
Docker Registry API v2 使用镜像摘要而不是镜像 ID 来区分镜像身份。
可以通过以下 API 调用从 HTTP 响应头的 Docker-Content-Digest
获取图像摘要:
$ REPOSITORY=fluent/fluentd
$ TOKEN=$(curl -s "https://auth.docker.io/token?service=registry.docker.io&scope=repository:$REPOSITORY:pull" | jq -r .token)
$ curl -s -D - -H "Authorization: Bearer $TOKEN" -H "Accept: application/vnd.docker.distribution.manifest.v2+json" https://index.docker.io/v2/$REPOSITORY/manifests/latest
HTTP/1.1 200 OK
Content-Length: 1982
Content-Type: application/vnd.docker.distribution.manifest.v2+json
Docker-Content-Digest: sha256:eaea1edffc34cff3b5e31ee738ea56e46326f90731b4139a19948814a4f0a4db
Docker-Distribution-Api-Version: registry/2.0
Etag: "sha256:eaea1edffc34cff3b5e31ee738ea56e46326f90731b4139a19948814a4f0a4db"
Date: Tue, 24 Jan 2017 13:34:53 GMT
Strict-Transport-Security: max-age=31536000
...
所有标签都可以通过以下API调用获取:
$ curl -s -H "Authorization: Bearer $TOKEN" https://index.docker.io/v2/$REPOSITORY/tags/list
{"name":"fluent/fluentd","tags":["edge-onbuild","edge","jemalloc","latest-onbuild","latest","onbuild","stable-onbuild","stable","ubuntu-base","v0.12-latest-onbuild","v0.12-latest","v0.12-onbuild","v0.12.16","v0.12.18","v0.12.19","v0.12.20","v0.12.21","v0.12.23","v0.12.24","v0.12.26-2","v0.12.26-onbuild","v0.12.26","v0.12.27-onbuild","v0.12.27","v0.12.28-onbuild","v0.12.28","v0.12.29-onbuild","v0.12.29","v0.12.30-onbuild","v0.12.30","v0.12.31-onbuild","v0.12.31","v0.12","v0.14-latest-onbuild","v0.14-latest","v0.14-onbuild","v0.14.1","v0.14.10-onbuild","v0.14.10","v0.14.11-onbuild","v0.14.11","v0.14.2","v0.14.6","v0.14.8","v0.14"]}
基于上述,要找到与特定标签相同的摘要,它将是如下脚本。
#!/bin/bash
REPOSITORY=$1
TARGET_TAG=$2
# get authorization token
TOKEN=$(curl -s "https://auth.docker.io/token?service=registry.docker.io&scope=repository:$REPOSITORY:pull" | jq -r .token)
# find all tags
ALL_TAGS=$(curl -s -H "Authorization: Bearer $TOKEN" https://index.docker.io/v2/$REPOSITORY/tags/list | jq -r .tags[])
# get image digest for target
TARGET_DIGEST=$(curl -s -D - -H "Authorization: Bearer $TOKEN" -H "Accept: application/vnd.docker.distribution.manifest.v2+json" https://index.docker.io/v2/$REPOSITORY/manifests/$TARGET_TAG | grep Docker-Content-Digest | cut -d ' ' -f 2)
# for each tags
for tag in ${ALL_TAGS[@]}; do
# get image digest
digest=$(curl -s -D - -H "Authorization: Bearer $TOKEN" -H "Accept: application/vnd.docker.distribution.manifest.v2+json" https://index.docker.io/v2/$REPOSITORY/manifests/$tag | grep Docker-Content-Digest | cut -d ' ' -f 2)
# check digest
if [[ $TARGET_DIGEST = $digest ]]; then
echo "$tag $digest"
fi
done
结果如下:
$ ./find_same_digest.sh fluent/fluentd latest
latest sha256:eaea1edffc34cff3b5e31ee738ea56e46326f90731b4139a19948814a4f0a4db
stable sha256:eaea1edffc34cff3b5e31ee738ea56e46326f90731b4139a19948814a4f0a4db
v0.12.31 sha256:eaea1edffc34cff3b5e31ee738ea56e46326f90731b4139a19948814a4f0a4db
v0.12 sha256:eaea1edffc34cff3b5e31ee738ea56e46326f90731b4139a19948814a4f0a4db
如果要查看本地镜像的摘要,可以通过docker images --digests
获取:
$ docker images --digests | grep fluentd
fluent/fluentd latest sha256:eaea1edffc34cff3b5e31ee738ea56e46326f90731b4139a19948814a4f0a4db 1788ee7dcfcc 14 hours ago 35.41 MB
关于docker - 如何通过 Docker Hub API 确定标签的 Docker 镜像 ID?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41808763/