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Remove dangling Docker images

caution rootDockerdebian, ubuntu

Caution: This command changes the system. Understand what it does before you run it.

root@server
docker image prune

Removes so-called dangling images, recognizable by <none> in docker images. They are created when a tag points to a different image after docker pull or a new build. Docker asks before deleting and reports the freed space at the end.

Note: With -a, all images not used by any container are deleted as well, including locally built ones that cannot be downloaded again. Docker commands require root or the docker group.

Also searched as

  • docker remove unused images
  • delete none images docker
  • docker image prune

Related one-liners

All in Docker

Clean up unused Docker data

#docker system prune
cautionDocker

Show Docker disk usage by images, containers and volumes

#docker system df -v
harmlessDocker

List unused Docker volumes

#docker volume ls --filter dangling=true
harmlessDocker

Remove all unused Docker data including volumes

#docker system prune -a --volumes
destructiveDocker

Show the disk usage of Docker containers

#docker ps -a --size
harmlessDocker

Analyze disk usage interactively with ncdu

$ncdu -x /var
harmlessFilesystem

Read first, then run.

The commands on myline.de act directly on servers, files and databases. A wrong path or placeholder can delete data irreversibly or make a server unreachable.

  • All commands are provided without warranty and are not tested on every system.
  • Understand what a command does before running it, and check every placeholder.
  • Make a backup first and, if possible, try it on a test system.
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