What is a dangling image and what is an unused image?

by

An unused image means that it has not been assigned or used in a container. For example, when running docker ps -a – it will list all of your exited and currently running containers. Any images shown being used inside any of containers are a “used image”.

On the other hand, a dangling image just means that you’ve created the new build of the image, but it wasn’t given a new name. So the old images you have becomes the “dangling image”. Those old image are the ones that are untagged and displays “<none>” on its name when you run docker images.

When running docker system prune -a, it will remove both unused and dangling images. Therefore any images being used in a container, whether they have been exited or currently running, will NOT be affected.

More Related Contents:

  1. How to copy files from host to Docker container?
  2. Why docker container exits immediately
  3. Use of Supervisor in docker
  4. Locating data volumes in Docker Desktop (Windows)
  5. Docker Compose – Share named volume between multiple containers
  6. In a Dockerfile, How to update PATH environment variable?
  7. How to remove old Docker containers
  8. How to keep Docker container running after starting services?
  9. How to show the run command of a docker container
  10. How to make sure docker’s time syncs with that of the host?
  11. Can I alias a subcommand? (shortening the output of `docker ps`)
  12. Am I trying to connect to a TLS-enabled daemon without TLS?
  13. Keras with TensorFlow backend not using GPU
  14. Docker and –userns-remap, how to manage volume permissions to share data between host and container?
  15. what is the point of using pm2 and docker together?
  16. Docker: Add a restart policy to a container that was already created
  17. How can I use a local file on container?
  18. Pull a local image to run a pod in Kubernetes
  19. Port forwarding in docker-machine?
  20. How to create a bidirectional link between containers?
  21. How can I list all tags for a Docker image on a remote registry?
  22. How to port data-only volumes from one host to another?
  23. What is the alternative to condition form of depends_on in docker-compose Version 3?
  24. How to execute a script when I terminate a docker container
  25. Add Insecure Registry to Docker
  26. How to get remote access to a private docker-registry?
  27. Differences Between Dockerfile Instructions in Shell and Exec Form
  28. Can I specify host directory to mount from Dockerfile
  29. What is meant by shared kernel in Docker?
  30. Multiple Docker containers and Celery

Leave a Comment