I have deleted all the images/containers
ubuntu@ubuntu:/var/lib/docker$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
ubuntu@ubuntu:/var/lib/docker$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
but I notice that there are still about 15GB inside /var/lib/docker
ubuntu@ubuntu:/var/lib/docker$ sudo du --max-depth=1 -h .
12G ./volumes
104K ./aufs
4,0K ./containers
1,3M ./image
4,0K ./trust
4,0K ./swarm
2,6G ./tmp
108K ./network
15G .
Questions:
How can I free up this space?
Is it safe to remove things inside /var/lib/docker?
Try (from docker 1.13):
docker system df
it shows you size of:
and remove local volumes using:
docker volume prune
For older Dockers try:
docker volume rm $(docker volume ls -q)
For my current docker version (1.12.1 for both Client & Server) a way to delete all volumes is by using:
docker volume rm $(docker volume ls -q)
but the following is safer: (thanks Matt for your comment)
$(docker volume ls -qf dangling=true)
Also from version: 1.13.0 (2017-01-18) some commands were added:
$ docker system prune
$ docker container prune
$ docker image prune
$ docker volume prune
$ docker network prune
Changelog: Add new
docker systemcommand withdfandprunesubcommands for system resource management, as well asdocker {container,image,volume,network} prunesubcommands #26108 #27525 / #27525
Most of the space is occupied by docker volume as you can see from your output:
12G ./volumes
Docker volumes are used to persist data for docker container and to share data between containers, and they are independent of the container’s lifecycle. So removing image/container will not free the disk space they occupied. Please refer to their official docs for more details.
If you're using latest version of docker, you can find volume related commands docs for more details(list/remove/create volumes e.g), for older version of docker, you can refer to this script on github for how to clean up volumes.
Hope this could be helpful:-)