1. registry创建

• docker官方提供一个搭建私有仓库的镜像registry，将镜像pull下来，端口设置5000。

docker pull registry:2

• registry服务器默认会将上传的镜像保存在容器中的/var/lib/registry,我们将主机的/home/xxx/docker/opt/registry目录挂载到该目录。

docker run -d -v /home/xxx/docker/opt/registry:/var/lib/registry -p 5000:5000 --name myregistry registry:2

• 浏览器访问http://127.0.0.1:5000/v2, 出现下面情况说明registry运行正常。
  
  image.png
• 将本地的镜像push到registry中，采用busybox进行测试。

docker pull busybox

docker tag busybox localhost:5000/busybox:latest

docker push localhost:5000/busybox:latest

通过curl验证一下

 curl -X GET http://127.0.0.1:5000/v2/_catalog

出现如下结果：

{"repositories":["busybox"]}

2. registry 中的镜像删除

• 进入registry

docker exec -it registry sh

• 查看config.yml, 在配置文件中storage配置中增加delete配置项。

vi /etc/docker/registry/config.yml

version: 0.1
log:
  fields:
    service: registry
storage:
  delete:
    enabled: true
  cache:
    blobdescriptor: inmemory
  filesystem:
    rootdirectory: /var/lib/registry
http:
  addr: :5000
  headers:
    X-Content-Type-Options: [nosniff]
health:
  storagedriver:
    enabled: true
    interval: 10s
    threshold: 3

• 查看当前仓库数据的大小

du -sch /var/lib/registry

892.0K  /var/lib/registry
892.0K  total

• 删除镜像的api如下：

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

name: 镜像名称
reference: 镜像对应的sha256值

• 获取镜像信息, 如何不加-Idigest的值会出错。
  ** 加-I的情况如下：

curl --header "Accept: application/vnd.docker.distribution.manifest.v2+json" -I -X GET http://127.0.0.1:5000/v2/busybox/manifests/latest
HTTP/1.1 200 OK
Content-Length: 527
Content-Type: application/vnd.docker.distribution.manifest.v2+json
Docker-Content-Digest: sha256:ee44b399df993016003bf5466bd3eeb221305e9d0fa831606bc7902d149c775b
Docker-Distribution-Api-Version: registry/2.0
Etag: "sha256:ee44b399df993016003bf5466bd3eeb221305e9d0fa831606bc7902d149c775b"
X-Content-Type-Options: nosniff
Date: Tue, 24 Nov 2020 07:52:55 GMT

** 不加-I情况如下：

curl --header "Accept:application/vnd.docker.distribution.manifest.v2+json" -X GET http://127.0.0.1:5000/v2/busybox/manifests/latest
{
   "schemaVersion": 2,
   "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
   "config": {
      "mediaType": "application/vnd.docker.container.image.v1+json",
      "size": 1457,
      "digest": "sha256:dc3bacd8b5ea796cea5d6070c8f145df9076f26a6bc1c8981fd5b176d37de843"
   },
   "layers": [
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "size": 764624,
         "digest": "sha256:5f5dd3e95e9fd44603cbb8968144999b730545267ce74d9b442f8f7f7827f776"
      }
   ]
}

我们也可以在主机的/home/xxx/docker/opt/registry中查看：

image.png

• 删除镜像

curl -I -X DELETE http://127.0.0.1:5000/v2/busybox/manifests/sha256:ee44b399df993016003bf5466bd3eeb221305e9d0fa831606bc7902d149c775b

出现Not Found命令行出错导致的。

HTTP/1.1 404 Not Found
Content-Type: text/plain; charset=utf-8
Docker-Distribution-Api-Version: registry/2.0
X-Content-Type-Options: nosniff
Date: Tue, 24 Nov 2020 07:08:45 GMT
Content-Length: 19

• 注意：配置完config.yml不要忘记重启一下registry

docker restart myregistry

HTTP/1.1 202 Accepted
Docker-Distribution-Api-Version: registry/2.0
X-Content-Type-Options: nosniff
Date: Tue, 24 Nov 2020 07:36:09 GMT
Content-Length: 0

• 如果误删了sha256:dc3bacd8b5ea796cea5d6070c8f145df9076f26a6bc1c8981fd5b176d37de843，查看数据大小。

888.0K  /var/lib/registry
888.0K  total

*删除sha256:ee44b399df993016003bf5466bd3eeb221305e9d0fa831606bc7902d149c775b，查看数据大小。（只是删除了元数据）

/ # du -sch /var/lib/registry/
860.0K  /var/lib/registry/
860.0K  total

• 查看registry数据目录

  
  
  image.png

垃圾回收

• 进行容器执行垃圾回收命令

/var/lib/registry # registry garbage-collect /etc/docker/registry/config.yml
busybox

0 blobs marked, 3 blobs and 0 manifests eligible for deletion
blob eligible for deletion: sha256:5f5dd3e95e9fd44603cbb8968144999b730545267ce74d9b442f8f7f7827f776
INFO[0000] Deleting blob: /docker/registry/v2/blobs/sha256/5f/5f5dd3e95e9fd44603cbb8968144999b730545267ce74d9b442f8f7f7827f776  go.version=go1.11.2 instance.id=d1fcb128-f544-452d-b2a6-caed701bd76f service=registry
blob eligible for deletion: sha256:dc3bacd8b5ea796cea5d6070c8f145df9076f26a6bc1c8981fd5b176d37de843
INFO[0000] Deleting blob: /docker/registry/v2/blobs/sha256/dc/dc3bacd8b5ea796cea5d6070c8f145df9076f26a6bc1c8981fd5b176d37de843  go.version=go1.11.2 instance.id=d1fcb128-f544-452d-b2a6-caed701bd76f service=registry
blob eligible for deletion: sha256:ee44b399df993016003bf5466bd3eeb221305e9d0fa831606bc7902d149c775b
INFO[0000] Deleting blob: /docker/registry/v2/blobs/sha256/ee/ee44b399df993016003bf5466bd3eeb221305e9d0fa831606bc7902d149c775b  go.version=go1.11.2 instance.id=d1fcb128-f544-452d-b2a6-caed701bd76f service=registry

• 查看数据大小

92.0K   /var/lib/registry/
92.0K   total

• 查看registry数据目录

  
  
  image.png