Thanks for confirming, Metin! These none stragglers are artifacts of the docker pull command, or at least the docker pull, docker tag sequence. They cannot be pruned either; the only way to remove is to rmi the pulled image (which became the parent of the “non-dangling” <none> and then it can be rmi’ed by id, and the pull and tag commands re-issued. Not sure why the “ghost” image is being created, possibly as a backup, but I would think “untag” would be the right way to go for these images.