====== Docker - Images - Remove dangling images ======

Docker images consist of multiple layers.  

Dangling images are layers that have no relationship to any tagged images.

  * They no longer serve a purpose and consume disk space.
  * They can be located by adding the filter flag, **-f** with a value of **dangling=true** to the docker images command.
  * When you're sure you want to delete them, you can add the **-q** flag, then pass their ID to docker rmi:

----

To list dangling images:

<code bash>
docker images -f dangling=true
</code>

----

To remove dangling images:

<code bash>
docker rmi $(docker images -f dangling=true -q)
</code>

or

<code bash>
docker rmi $(docker images --filter "dangling=true" -q --no-trunc)
</code>

----

An alternative to listing dangling images:

<code bash>
docker images | awk '/<none>/ { print $3 }'
</code>

----