Docker remove <none> TAG images

Just run this command:

docker image prune --filter="dangling=true"

You can try and list only untagged images (ones with no labels, or with label with no tag):

docker images -q -a | xargs docker inspect --format='{{.Id}}{{range $rt := .RepoTags}} {{$rt}} {{end}}'|grep -v ':'

However, some of those untagged images might be needed by others.

I prefer removing only dangling images:

docker rmi $(docker images --filter "dangling=true" -q --no-trunc)

As I mentioned for for docker 1.13+ in Sept. 2016 in "How to remove old and unused Docker images", you can also do the image prune command:

docker image prune

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That being said, Janaka Bandara mentions in the comments:

This did not remove <none>-tagged images for me (e.g. foo/bar:<none>); I had to use docker images --digests and docker rmi foo/bar@<digest>

Janaka references "How to Remove a Signed Image with a Tag" from Paul V. Novarese:

# docker images
REPOSITORY               TAG                 IMAGE ID            CREATED             SIZE
pvnovarese/mprime        latest              459769dbc7a1        5 days ago          4.461 MB
pvnovarese/mprime        <none>              459769dbc7a1        5 days ago          4.461 MB

Diagnostic Steps

You can see the difference in these two entries if you use the --digests=true option (the untagged entry has the Docker Content Trust signature digest):

# docker images --digests=true
REPOSITORY               TAG                 DIGEST                                                                    IMAGE ID            CREATED             SIZE
pvnovarese/mprime        latest              <none>                                                                    459769dbc7a1        5 days ago          4.461 MB
pvnovarese/mprime        <none>              sha256:0b315a681a6b9f14f93ab34f3c744fd547bda30a03b55263d93861671fa33b00   459769dbc7a1        5 days ago     

Note that Paul also mentions moby issue 18892:

After pulling a signed image, there is an "extra" entry (with tag <none>) in "docker images" output.
This makes it difficult to rmi the image (you have to force it, or else first delete the properly-tagged entry, or delete by digest.

docker image prune removes all dangling images (those with tag none). docker image prune -a would also remove any images that have no container that uses them.

The difference between dangling and unused images is explained in this stackoverflow thread.

docker images -a | grep none | awk '{ print $3; }' | xargs docker rmi

You can try this simply