'Selectively prune docker images by tag
If there are multiple image tags for a used image, docker image prune -a will keep the alphabetically last tag. Please see a reproducible example at the bottom.
Is there a way to influence which tags will be kept? Ideally, I would like docker image prune -a to keep all image-tag combinations that are in use (in use includes stopped containers).
Reproducible example (careful as it will delete images from your docker system):
# docker image prune -a keeps hellow-world:x
docker pull hello-world
docker tag hello-world:latest hello-world:x
docker tag hello-world:latest hello-world:a
docker run hello-world:x
docker run hello-world:a
docker image prune -a
# Reset
docker system prune -a
# docker image prune -a keeps hellow-world:z
docker pull hello-world
docker tag hello-world:latest hello-world:x
docker tag hello-world:latest hello-world:z
docker run hello-world:x
docker run hello-world:z
docker image prune -a
Sources
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Source: Stack Overflow
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