Docker仓库在2.1版本中支持了删除镜像的API,但这个删除操作只会删除镜像元数据,不会删除层数据。在2.4版本中对这一问题进行了解决,增加了一个垃圾回收命令,删除未被引用的层数据。本文对这一特性进行了体验,具体步骤如下。
1、部署镜像仓库
(1)启动仓库容器
复制代码 代码如下:
dockerrun -d -v /home/config.yml:/etc/docker/registry/config.yml -p 4000:5000 --nametest_registryregistry:2.4.1
这里需要说明一点,在启动仓库时,需在配置文件中的storage配置中增加delete=true配置项,允许删除镜像,本次试验采用如下配置文件:
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root@SZX1000041895:/ # cat /home/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 |
(2)上传镜像
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root@SZX1000041894: /home # docker tag centos 10.229.43.217:4000/xcb/centos root@SZX1000041894: /home # docker push 10.229.43.217:4000/xcb/centos Thepushrefersto a repository [10.229.43.217:4000 /xcb/centos ] 5f70bf18a086: Pushed 4012bfb3d628: Pushed latest: digest: sha256:5b367dbc03f141bb5246b0dff6d5fc9c83d8b8d363d0962f3b7d344340e458f6 size: 1331 |
(3)查看数据进行仓库容器中,通过du命令查看大小,可以看到当前仓库数据大小为61M。
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root@SZX1000041895:~ # docker exec -it test_registry /bin/bash root@e6d36b0d7e86:/ # du -sch /var/lib/registry 61M . 61M total |
2、删除镜像
删除镜像对应的API如下:
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DELETE /v2/ <name> /manifests/ <reference> |
name:镜像名称
reference: 镜像对应sha256值
(1)发送请求,删除刚才上传的镜像
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root@SZX1000041894: /home # curl -I -X DELETE http://10.229.43.217:4000/v2/xcb/centos/manifests/sha256:5b367dbc03f141bb5246b0dff6d5fc9c83d8b8d363d0962f3b7d344340e458f6 HTTP /1 .1 202 Accepted Docker-Distribution-Api-Version: registry /2 .0 X-Content-Type-Options: nosniff Date: Wed, 06 Jul 2016 09:24:15 GMT Content-Length: 0 Content-Type: text /plain ; charset=utf-8 |
(2)查看数据大小
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root@e6d36b0d7e86: /var/lib/registry # du -sch 61M . 61M total |
可以看到数据大小没有变化(只删除了元数据)
3、垃圾回收
(1)进行容器执行垃圾回收命令
命令:
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registry garbage-collect config.yml |
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root@e6d36b0d7e86: /var/lib/registry # registry garbage-collect /etc/docker/registry/config.yml INFO[0000] Deletingblob: /docker/registry/v2/blobs/sha256/96/9687900012707ea43dea8f07a441893903dd642d60668d093c4d4d2c5bedd9eb go.version=go1.6.2 instance. id =4d875a6c-764d-4b2d-a7c2-4e85ec2b9d58 INFO[0000] Deletingblob: /docker/registry/v2/blobs/sha256/a3/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4 go.version=go1.6.2 instance. id =4d875a6c-764d-4b2d-a7c2-4e85ec2b9d58 INFO[0000] Deletingblob: /docker/registry/v2/blobs/sha256/c3/c3bf6062f354b9af9db4481f24f488da418727673ea76c5162b864e1eea29a4e go.version=go1.6.2 instance. id =4d875a6c-764d-4b2d-a7c2-4e85ec2b9d58 INFO[0000] Deletingblob: /docker/registry/v2/blobs/sha256/5b/5b367dbc03f141bb5246b0dff6d5fc9c83d8b8d363d0962f3b7d344340e458f6 go.version=go1.6.2 instance. id =4d875a6c-764d-4b2d-a7c2-4e85ec2b9d58 |
(2)查看数据大小
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root@e6d36b0d7e86: /var/lib/registry # du -sch 108K . 108K total |
可以看到镜像数据已被删除,从61M变成了108K
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.tuicool.com/articles/y26nyar