1. registry創(chuàng)建

• docker官方提供一個(gè)搭建私有倉庫的鏡像registry，將鏡像pull下來，端口設(shè)置5000。

docker pull registry:2

• registry服務(wù)器默認(rèn)會將上傳的鏡像保存在容器中的/var/lib/registry,我們將主機(jī)的/home/xxx/docker/opt/registry目錄掛載到該目錄。

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

• 瀏覽器訪問http://127.0.0.1:5000/v2, 出現(xiàn)下面情況說明registry運(yùn)行正常。
  
  image.png
• 將本地的鏡像push到registry中，采用busybox進(jìn)行測試。

docker pull busybox

docker tag busybox localhost:5000/busybox:latest

docker push localhost:5000/busybox:latest

通過curl驗(yàn)證一下

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

出現(xiàn)如下結(jié)果：

{"repositories":["busybox"]}

2. registry 中的鏡像刪除

• 進(jìn)入registry

docker exec -it registry sh

• 查看config.yml, 在配置文件中storage配置中增加delete配置項(xiàng)。

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

• 查看當(dāng)前倉庫數(shù)據(jù)的大小

du -sch /var/lib/registry

892.0K  /var/lib/registry
892.0K  total

• 刪除鏡像的api如下：

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

name: 鏡像名稱
reference: 鏡像對應(yīng)的sha256值

• 獲取鏡像信息, 如何不加-Idigest的值會出錯(cuò)。
  ** 加-I的情況如下：

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情況如下：

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"
      }
   ]
}

我們也可以在主機(jī)的/home/xxx/docker/opt/registry中查看：

image.png

• 刪除鏡像

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

出現(xiàn)Not Found命令行出錯(cuò)導(dǎo)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不要忘記重啟一下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

• 如果誤刪了sha256:dc3bacd8b5ea796cea5d6070c8f145df9076f26a6bc1c8981fd5b176d37de843，查看數(shù)據(jù)大小。

888.0K  /var/lib/registry
888.0K  total

*刪除sha256:ee44b399df993016003bf5466bd3eeb221305e9d0fa831606bc7902d149c775b，查看數(shù)據(jù)大小。（只是刪除了元數(shù)據(jù)）

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

• 查看registry數(shù)據(jù)目錄

  
  
  image.png

垃圾回收

• 進(jìn)行容器執(zhí)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

• 查看數(shù)據(jù)大小

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

• 查看registry數(shù)據(jù)目錄

  
  
  image.png