Table of Contents

About

Docker host disk sizing management.

Docker stores all layers/images in its file formate (i.e. aufs) in default /var/lib/docker directory.

Management

Show space

docker system df

TYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE
Images              16                  3                   3.774GB             2.227GB (59%)
Containers          5                   0                   233.1MB             233.1MB (100%)
Local Volumes       2                   1                   35.73MB             0B (0%)

Containers

Remove the container that where not used months ago 

docker ps --filter "status=exited" | grep 'months ago' | awk '{print $1}' | xargs --no-run-if-empty docker rm

See also: docker container prune

Images

Docker - Image

Untagged

Ie with the tag none. 

docker rmi $(docker images -q -f dangling=true)
# or
docker image ls | grep 'none' | awk '{print $3}' | xargs --no-run-if-empty docker image rm

Old

docker image ls | grep 'months ago' | awk '{print $1"\:"$2}' | xargs --no-run-if-empty docker image rm

Volume

Orphaned / Unused

To delete orphaned volumes in Docker 1.9 and up 

docker volume prune

Dangling volume

docker volume rm $(docker volume ls -qf dangling=true)

System

docker system prune

clean up containers, images, volumes, and networks all in one command.

Documentation / Reference