docker - 如何删除标签而不删除Docker镜像本身？

Question

每次拉图像时，都会拉两个标签。像这样:

centos  6       f07f6ca555a5  4 weeks ago  194.6 MB  
centos  <none>  f07f6ca555a5  4 weeks ago  194.6 MB

如何仅删除后面的标签？

$ docker info
Containers: 2
 Running: 0
 Paused: 0
 Stopped: 2
Images: 13
Server Version: 1.12.1
Storage Driver: aufs
 Root Dir: /mnt/sda1/var/lib/docker/aufs
 Backing Filesystem: extfs
 Dirs: 181
 Dirperm1 Supported: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge overlay host null
Kernel Version: 4.4.17-boot2docker
Operating System: Boot2Docker 1.12.1 (TCL 7.2); HEAD : ef7d0b4 - Thu Aug 18 21:18:06 UTC 2016
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 7.604 GiB
Name: default
ID: WUS6:YHEN:O4U4:6GYZ:ECIX:5KQA:SAYJ:HNPY:RJB4:AEMR:QQCE:777M
Docker Root Dir: /mnt/sda1/var/lib/docker
Debug mode (client): false
Debug mode (server): true
 File Descriptors: 14
 Goroutines: 23
 System Time: 2016-10-10T02:13:57.107136165Z
 EventsListeners: 0
Registry: https://index.docker.io/v1/
Labels:
 provider=virtualbox

docker rmi $( docker 图像--filter“dangling = true” -q --no-trunc)
该命令对我不起作用。实际上，它们是相同的图像。

Answer 1

这实际上是1.11.2错误，已在issue 23895和issue 23503中报告。
它应该用PR 23549在1.12.x中修复:“不要在输出中显示摘要引用的空标签”。

When a repository has a tag and digests, show tag for each digest value.
Rows will not be duplicated for the same image name which has both a tag and a digest.

如果您仍在1.12.1中看到此内容，则应该打开一个新问题，因为它可能是从1.12.0开始的回归。