How to analyze disk usage of a Docker container

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

docker ps --size

After 1.13.0, Docker includes a new command docker system df to show docker disk usage.

$ docker system dfTYPE            TOTAL        ACTIVE     SIZE        RECLAIMABLEImages          5            1          2.777 GB    2.647 GB (95%)Containers      1            1          0 B         0BLocal Volumes   4            1          3.207 GB    2.261 (70%)

To show more detailed information on space usage:

$ docker system df --verbose

Posting this as an answer because my comments above got hidden:

List the size of a container:

du -d 2 -h /var/lib/docker/devicemapper | grep `docker inspect -f "{{.Id}}" <container_name>`

List the sizes of a container's volumes:

docker inspect -f "{{.Volumes}}" <container_name> | sed 's/map\[//' | sed 's/]//' | tr ' ' '\n' | sed 's/.*://' | xargs sudo du -d 1 -h

Edit:List all running containers' sizes and volumes:

for d in `docker ps -q`; do    d_name=`docker inspect -f {{.Name}} $d`    echo "========================================================="    echo "$d_name ($d) container size:"    sudo du -d 2 -h /var/lib/docker/devicemapper | grep `docker inspect -f "{{.Id}}" $d`    echo "$d_name ($d) volumes:"    docker inspect -f "{{.Volumes}}" $d | sed 's/map\[//' | sed 's/]//' | tr ' ' '\n' | sed 's/.*://' | xargs sudo du -d 1 -hdone

NOTE: Change 'devicemapper' according to your Docker filesystem (e.g 'aufs')