Issue

• /var/lib/docker is consuming large amounts of storage. Why is docker using /var/lib/docker/container and not the volume group/logical volume we have assigned to it?
• We have set up docker to use a logical volume for storage as follows, yet it still uses /var/lib/docker/ for storage

cat /etc/sysconfig/docker-storage
DOCKER_STORAGE_OPTIONS=--storage-driver devicemapper --storage-opt dm.fs=xfs --storage-opt dm.thinpooldev=/dev/mapper/docker-docker--pool --storage-opt dm.use_deferred_removal=true

and

cat /etc/sysconfig/docker-storage-setup 
# Edit this file to override any configuration options specified in
# /usr/lib/docker-storage-setup/docker-storage-setup.
#
# For more details refer to "man docker-storage-setup"
VG=docker

• When /var/lib/docker fills up, it fills up the entire root partition and makes the system inoperative.