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 <container_name> 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?