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0x4D616E75/Shrink Docker for Mac qcow2 file

Forked from vadikgo/Shrink Docker for Mac qcow2 file
Created September 10, 2016 17:52
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Shrink Docker for Mac qcow2 file
(https://forums.docker.com/t/cleaning-up-docker-for-mac/17894)
ls -lh ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/Docker.qcow2
docker run -it --rm -v /:/host alpine chroot /host /bin/sh -c 'dd if=/dev/zero of=/var/lost+found/zeroes; rm /var/lost+found/zeroes'
cd ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux
/Applications/Docker.app/Contents/MacOS/qemu-img convert -p -O qcow2 Docker.qcow2 Docker-slim.qcow2
mv Docker-slim.qcow2 Docker.qcow2
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