cleaning up docker

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cleaning up docker

August 26th, 2018 by Jeanne Boyarsky

It’s been a while since I used Docker on my machine so I decided to clean things up. When I launched Docker, it prompted me to upgrade. Half a gig but easy to get that out of the way at least.

Then I ran “docker images” and was reminded that I haven’t done a good job of keeping this clean. I had:

  • the original docker-whale play
  • a bunch of experiments from when I didn’t know what I was doing (some of which have unnamed layers so I don’t even know what they are)
  • some Java 9 early access edition stuff
  • following along with the “Kubernetes in Action” book when I was the Technical Development Editor
  • a lab I went to

Note: i’m not sure if any of this is a good way of doing things. But it worked for me.

Deleting the images the slow way

Yuck. I decided to delete all the images. For some, it was easy. Just run “docker rmi <imageHash>”.

For some, I got

Error response from daemon: conflict: unable to delete xxx (cannot be forced) - image has dependent child images

I also tried running “docker rmi $(docker images -a -q)” to delete all the images. This deleted some, but gave the same dependent child images error.

Great, I don’t know what they are.  Luckily, StackOverflow had a command to find the children.

for i in $(docker images -q)
do
    docker history $i | grep -q xxx && echo $i
done | sort -u

I also got:

Error response from daemon: conflict: unable to delete xxx (must be forced) - image is referenced in multiple repositories

For these, it was just a matter of running “docker -rmi –force xxx.”

Deleting the images the fast way

I deleted the rest of the images with:

“docker rmi –force $(docker images -a -q)”

Containers and volumes

I did a far better job of cleaning these up!

docker ps -a

docker volume ls

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