Title: Message Title
Dwight Guth commented on JENKINS-40723
Re: Built Dockerfile images are never removed
I definitely side with the people who think that this was resolved prematurely. We have been running docker image prune on our Jenkins node that we recently migrated to dockerfiles, and each time it ran it was freeing up less and less space. What we eventually realized is that because Jenkins is tagging every build with a tag corresponding to the hash of the dockerfile, when the dockerfile changes, it does not untag the old build (because the new tag is different from the old tag), so the old build is not marked as dangling, and you have to run the significantly more aggressive `docker image prune -a` to clean it up. I believe Jenkins should be tagging these builds with something that is deterministic across builds to the same job and branch, and deleting all the tags associated with change requests when the change request closes and the jenkins branch is deleted.
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