Enige advies over hoe ruimte te besparen?

[debryc (Deborah Chang)]

I got additional instructions on how to handle the following:

@debryc

rofranoJohn Rofrano

Nov '17

It is important to understand why you have intermediate untagged images showing as <none> <none> in order to avoid them since, as you have seen, you can’t remove them if they are in use.

The reason untagged images happen is because you built an image, then you changed the Dockerfile and built that image again and it reused some of the layers from the previous build. Now you have an untagged image which cannot be deleted because some of it’s layers are being used by a new version of that image.

The solution is to:

• Delete the new version of the image
• Delete the untagged image and
• Rebuild the new version of the image so that it owns all of the layers.

You will be left with a single tagged image that contains all of the layers of the previous untagged images and the new image.

~jr

The details are:

rofranoJohn Rofrano

1

20h

The command to remove an image is:

docker rmi {image_name}

Where {image_name} is the name of the image you want to delete. You can also use the image ID to delete the image (e.g., docker rmi {image_id}). This is what you will need to use to delete an image with a name of <none>.

For example, Let’s say you have the following images:

REPOSITORY           TAG        IMAGE ID       CREATED              SIZE
my-new-image         latest     c18f86ab8daa   12 seconds ago       393MB
<none>               <none>     b1ee72ab84ae   About a minute ago   393MB
my-image             latest     f5a5f24881c3   2 minutes ago        393MB

It is possible that the <none> image cannot be deleted because the my-new-image is using some layers from it. What you need to do is:

docker rmi my-new-image:latest
docker rmi b1ee72ab84ae
docker built -t my-new-image .

What that does is remove my-new-image:latest which is reusing layers from the <none> image. It then deletes the <none> image using it’s image ID b1ee72ab84ae. Finally it rebuilds my-new-image creating all of the layers that are needed.

Also check to make sure that you don’t have stopped containers that are still using the <none> “untagged” image. Use docker ps -a to see all image including ones that have exited. If so, use docker rm {container_id} to remove the container and then try and remove the <none> image again.

What do you all think?