在使用Docker API提取centos映像时，根据文档here，它开始下载centos的所有可能映像（5、5.11、6、6.10等）：
{"status":"Pulling from library/centos","id":"6.10"}
{"status":"Pulling fs layer","progressDetail":{},"id":"1c8f9aa56c90"}
{"status":"Downloading","progressDetail":{"current":539797,"total":69804062},"progress":"[\u003e ] 539.8kB/69.8MB","id":"1c8f9aa56c90"}
{"status":"Downloading","progressDetail":{"current":5917381,"total":69804062},"progress":"[====\u003e ] 5.917MB/69.8MB","id":"1c8f9aa56c90"}
{"status":"Downloading","progressDetail":{"current":12896965,"total":69804062},"progress":"[=========\u003e ] 12.9MB/69.8MB","id":"1c8f9aa56c90"}
...
{"status":"Downloading","progressDetail":{"current":59587269,"total":69804062},"progress":"[==========================================\u003e ] 59.59MB/69.8MB","id":"1c8f9aa56c90"}
{"status":"Downloading","progressDetail":{"current":64400069,"total":69804062},"progress":"[==============================================\u003e ] 64.4MB/69.8MB","id":"1c8f9aa56c90"}
{"status":"Verifying Checksum","progressDetail":{},"id":"1c8f9aa56c90"}
{"status":"Download complete","progressDetail":{},"id":"1c8f9aa56c90"}
{"status":"Extracting","progressDetail":{"current":557056,"total":69804062},"progress":"[\u003e ] 557.1kB/69.8MB","id":"1c8f9aa56c90"}
{"status":"Extracting","progressDetail":{"current":2228224,"total":69804062},"progress":"[=\u003e ] 2.228MB/69.8MB","id":"1c8f9aa56c90"}
{"status":"Extracting","progressDetail":{"current":3342336,"total":69804062},"progress":"[==\u003e ] 3.342MB/69.8MB","id":"1c8f9aa56c90"}
...
{"status":"Extracting","progressDetail":{"current":15597568,"total":69804062},"progress":"[===========\u003e ] 15.6MB/69.8MB","id":"1c8f9aa56c90"}
/home # {"status":"Extracting","progressDetail":{"current":16711680,"total":69804062},"progress":"[===========\u003e ] 16.71MB/69.8MB","id":"1c8f9aa56c90"}
{"status":"Extracting","progressDetail":{"current":18382848,"total":69804062},"progress":"[=============\u003e ] 18.38MB/69.8MB","id":"1c8f9aa56c90"}
{"status":"Extracting","progressDetail":{"current":20054016,"total":69804062},"progress":"[==============\u003e ] 20.05MB/69.8MB","id":"1c8f9aa56c90"}
{"status":"Extracting","progressDetail":{"current":20611072,"total":69804062},"progress":"[==============\u003e ] 20.61MB/69.8MB","id":"1c8f9aa56c90"}
{"status":"Extracting","progressDetail":{"current":21725184,"total":69804062},"progress":"[===============\u003e ] 21.73MB/69.8MB","id":"1c8f9aa56c90"}
{"status":"Extracting","progressDetail":{"current":23396352,"total":69804062},"progress":"[================\u003e ] 23.4MB/69.8MB","id":"1c8f9aa56c90"}
...
{"status":"Extracting","progressDetail":{"current":69804062,"total":69804062},"progress":"[==================================================\u003e] 69.8MB/69.8MB","id":"1c8f9aa56c90"}
{"status":"Pull complete","progressDetail":{},"id":"1c8f9aa56c90"}
{"status":"Digest: sha256:b4c3fe75b135ca1c26ef6feb8153aade8a31c4e3e763376529c1088de7e973f4"}
{"status":"Pulling from library/centos","id":"6.6"}
{"status":"Pulling fs layer","progressDetail":{},"id":"f9f73d801f05"}
{"status":"Downloading","progressDetail":{"current":539318,"total":73694253},"progress":"[\u003e ] 539.3kB/73.69MB","id":"f9f73d801f05"}
{"status":"Downloading","progressDetail":{"current":7477942,"total":73694253},"progress":"[=====\u003e ] 7.478MB/73.69MB","id":"f9f73d801f05"}
...
{"status":"Downloading","progressDetail":{"current":50543286,"total":73694253},"progress":"[==================================\u003e ] 50.54MB/73.69MB","id":"f9f73d801f05"}
{"status":"Downloading","progressDetail":{"current":55929526,"total":73694253},"progress":"[=====================================\u003e ] 55.93MB/73.69MB","id":"f9f73d801f05"}
我使用了以下API：
curl -X POST -H "Content-Type: application/json" --unix-socket /var/run/docker.sock http://v1.27/images/create?fromImage=centos&tag=latest
他们提到我需要指定tag参数，以防止下载所有图像：
标记或摘要。如果拉动图像时为空，则会导致所有标签 以便将给定的图像拉出。
我做到了，仍然下载了所有图像。