What is Docker.qcow2?

Question

I was looking at my disk with DaisyDisk and I have a 30GB something called Docker.qcow2. More specifically, DaisyDisk puts it under ~/Library/Containers/com.docker.doc

Answer 1

If you stumbled upon this, you're probably not stoked about a 64gb file. If you open up Docker > Preferences, you can tone it down quite a bit to a more reasonable size. Doing this will delete the old cow file, and that will delete your containers, so be careful.