I've been searching for a while, but couldn't find a way to analyze the disk usage of a Docker container / volume.

I can see that Docker takes 12GB of my filesystem:

2.7G /var/lib/docker/vfs/dir

2.7G /var/lib/docker/vfs

2.8G /var/lib/docker/devicemapper/mnt

6.3G /var/lib/docker/devicemapper/devicemapper

9.1G /var/lib/docker/devicemapper

12G /var/lib/docker

But, how do I know how this is distributed over the containers?

I tried to attach to the containers by running (the new v1.3 command)

docker exec -it bash

and then running 'df -h' to analyze the disk usage. It seems to be working, but not with containers that use 'volumes-from'.

For example, I use a data-only container for MongoDB, called 'mongo-data'.

When I run 'docker run -it --volumes-from mongo-data busybox', and then 'df -h' inside the container, It says that the filesystem mounted on '/data/db' (my 'mongo-data' data-only container) uses 11.3G, but when I do 'du -h /data/db', it says that it uses only 2.1G.

So, how do I analyze a container/volume disk usage? Or, in my case, how do I find out the 'mongo-data' container size?

Many thanks,

解决方案

To see the file size of your containers, you can use the -s argument of docker ps:

docker ps -s