Earlier docker container and images would keep on occupying spaces until unless manually cleaned up. The clean command included piped commands.

For example to clean all exited contained

$ docker ps -a -q -f status=exited | xargs docker rm -v 

And to delete volumes or images different commands had to be used. But with Docker 17.05 now out. This is a simple command

$ docker system prune

If you don’t want any confirmation, then add the -f flag at the end

$ docker system prune -f
WARNING! This will remove:
	- all stopped containers
	- all volumes not used by at least one container
	- all networks not used by at least one container
	- all dangling images
Are you sure you want to continue? [y/N] y
Deleted Containers:
6cef5384f93c7e6bdbe0a8193fb1f134220b44cb2b497f758dd7a840ed10fc21
....
d255bdaaee4cb807d4897ce8dd71e0638aaa13dc4619014998579c2d29913d15

Deleted Volumes:
01a73b76d52a9b26e07bc4f828861a35ad77ef32eaddb65702e8489171e90214
....

Deleted Networks:
journals_default
....

Deleted Images:
deleted: sha256:0b5a2cad4b1e7763bf920cc631abbc0cf3e9ceb49fe4363c4bed5d4af83b9321
...

Total reclaimed space: 5.184GB

As you can see I reclaimed 5GB+ space on my VM, which earlier required multpile commands. The system command also has a df subcommand which shows disk usage

vagrant@vagrant:~$ docker system df
TYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE
Images              36                  0                   8.301GB             8.301GB (100%)
Containers          0                   0                   0B                  0B
Local Volumes       0                   0                   0B                  0B