CentOS Linux release 7.3.1611(Core)
Docker version 1.12.6, build3a094bd/1.12.6
is used.
The disk space was full, so I checked and found that the docker's data area was large.
$cd/var/lib/docker/devicemapper/devicemapper/
$ ls-l
Total 9966968
-rw ----------- 1 root root 107374182400 January 17:13 data
-rw ----------- 1 root root 2147483648 January 17 17:10 metadata
I have deleted (docker rmi) the images of docker, but it seems to be ineffective.
I also found docker system prune online, but
#docker system prune
docker: 'system' is not a docker command.
See'docker --help'.
I don't know if it's because the docker version is low, but there seems to be no command.
What should I do to reduce the data area of docker?Please let me know if you know.
centos docker
When docker system prune was not present, the following commands removed unnecessary items:
Delete untagged image
docker rmi$(docker images-qf dangling=true)
Delete Stopped Container
docker rm$(docker ps-a-q)
Delete Unlinked Volume
Delete untagged images
docker rmi$(docker images-qf dangling=true)
Delete Stopped Containers
docker rm$(docker ps-a-q)
US>Delete Unlinked Volumes
not tied to containersRemove volumes that are not tied to the container.
Note that even the required volume must be removed if the container is not up.
docker volume $(docker volumes-qf dancing=true)
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