Docker taking much more space than sum of containers, images and volumes

Question

Docker running on Ubuntu is taking 18G of disk space (on a partition of 20G), causing server crashes. Commands below show that there is a serious mismatch between "official" image, container and volume sizes and the docker folder size.

What causes this and how can I cleanup ?

I already tried docker system prunewhich doesn't help.

du -sh /var/lib/docker

docker system df

du -sh /var/lib/docker/*

du -sh /var/lib/docker/containers/*

Answer 1

I was having the same problem. I solved my problem by deleting log files

sudo sh -c "truncate -s 0 /var/lib/docker/containers/*/*-json.log"

Link: How to clear the logs properly for a Docker container?