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Why do I see 'none' Docker images in Container Station, and how can I remove them?

Last modified date: 2025-09-17

Applicable Products

Container Station

Symptom

In Container Station, you may notice Docker images with the name "none." These are known as dangling images. They appear when a new version of an image with the same name and tag replaces the old one, leaving the previous version without a tag.

Dangling images may also remain if other containers or images still depend on them. In this case, you will not be able to delete them until all dependencies are removed.

Solution

Dangling images ("none" images) are a normal part of Docker’s design and do not indicate an error. If you want to remove them, first confirm that they are not being used by any containers.

  1. Open an SSH connection to your NAS. If you are unfamiliar with SSH, see the QNAP documentation for instructions.
  2. Run the following commands:
    • docker image ls --filter dangling=true – shows dangling images
    • docker image ls -a – lists all images
    • docker ps -a --filter ancestor=<image_id> – checks if any containers depend on the image (replace <image_id> with the actual image ID)

If no containers are using the "none" image, you can safely remove it with:

docker image rm <image_id>
Info
If a container is still using a "none" (dangling) image, stop or delete that container before removing the image. Removing in-use images may disrupt running applications.

Example:


This screenshot shows dangling ("none") images in Container Station.

Further Reading

For more information, see the following FAQs:

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