Reading through various other Github issues, it sounds like these can occasionally orphan themselves which prevents them from getting cleaned up properly. This is where the container diffs get cached. The bulk of the disk usage was in /var/lib/docker/aufs. In a internet browser, move to to see the nginx homepage. $ docker operate -d -g 80:80 -name webserver nginx. Like the hello-world image above, if the picture is not really found locally, Docker pulls it from Docker Hub. $ docker operate hello-world Incapable to discover image 'hello-world:latest' in your area most recent: Tugging from library/hello-world ca4n61b1923c: Pull complete Digest: sha256:ca0eeb6fb05351dfc8759c20733c91def84cb8007aa89a5bf606bc8b315b9fc7 Standing: Downloaded newer picture for hello-world:latest Hello from Docker! This message shows that your installation appears to become working properly.