docker删除仓库中的镜像问题

Question

配置文件挂载到本地的宿主机了

docker run -d -p 6000:5000 --restart=always --name registry -v `pwd`/config.yml:/etc/docker/registry/config.yml registry:2

修改过配置文件

查看仓库中的镜像信息

 curl -X GET http://127.0.0.1:6000/v2/_catalog
{"repositories":["myfirstimage","myfirstimage_2","myfirstimage_3"]}

获取digest值

curl  -I -X GET http://127.0.0.1:6000/v2/myfirstimage/manifests/latest                                                                 
HTTP/1.1 200 OK
Content-Length: 5559
Content-Type: application/vnd.docker.distribution.manifest.v1+prettyjws
Docker-Content-Digest: sha256:3a07b4e06c73b2e3924008270c7f3c3c6e3f70d4dbb814ad8bff2697123ca33c
Docker-Distribution-Api-Version: registry/2.0
Etag: "sha256:3a07b4e06c73b2e3924008270c7f3c3c6e3f70d4dbb814ad8bff2697123ca33c"
X-Content-Type-Options: nosniff
Date: Sun, 31 Jul 2016 11:09:22 GMT

删除测试

curl  -X DELETE http://127.0.0.1:6000/v2/myfirstimage/manifests/sha256:3a07b4e06c73b2e3924008270c7f3c3c6e3f70d4dbb814ad8bff2697123ca33c
{"errors":[{"code":"MANIFEST_UNKNOWN","message":"manifest unknown"}]}

删除失败，这是为咋的

Answer 1

问题出在了取 digest 的那一步。在 registry 2.3 及其以后的版本，为了防止误删除，在取 digest 的时候，必须提供一个特殊的头：

Accept: application/vnd.docker.distribution.manifest.v2+json

否则会返回一个错误的 digest。因此，取 digest 的语句应该用下面的形式：

curl --header "Accept: application/vnd.docker.distribution.manifest.v2+json" \
  -I \
  -X HEAD http://127.0.0.1:6000/v2/myfirstimage/manifests/latest

这样取到的 digest 才是正确的。

参考官方文档：https://docs.docker.com/regis...

Answer 2

docker run -d -p 6000:5000 --restart=always --name registry6 -v pwd/config.yml:/etc/docker/registry/config.yml docker.io/registry:2.5.0

报错：37ba01d64aec14577e9e55ea2b2bfc4487eb070fad1b1c40e76e7cbddc916e6a
/usr/bin/docker-current: Error response from daemon: invalid header field value "oci runtime error: container_linux.go:247: starting container process caused "process_linux.go:359: container init caused \"rootfs_linux.go:54: mounting \\\"/root/config.yml\\\" to rootfs \\\"/var/lib/docker/devicemapper/mnt/2e35c587d0e8ff8ac8811a58b23cd3a489ff04b4eaa47b3d25fda2bd46b7646b/rootfs\\\" at \\\"/var/lib/docker/devicemapper/mnt/2e35c587d0e8ff8ac8811a58b23cd3a489ff04b4eaa47b3d25fda2bd46b7646b/rootfs/etc/docker/registry/config.yml\\\" caused \\\"not a directory\\\"\""n".
这说怎么回事？？我也想修改config.yml。求指教