devicemapper.sh

#!/bin/bash
yum install -y lvm2
pvcreate /dev/sdc
vgcreate docker /dev/sdc
lvcreate --wipesignatures y -n thinpool docker -l 95%VG
lvcreate --wipesignatures y -n thinpoolmeta docker -l 1%VG
lvconvert -y --zero n -c 512K --thinpool docker/thinpool --poolmetadata docker/thinpoolmeta

cat<<-EOS>/etc/lvm/profile/docker-thinpool.profile
activation {
  thin_pool_autoextend_threshold = 80
  thin_pool_autoextend_percent = 20
}
EOS

lvchange --metadataprofile docker-thinpool docker/thinpool
lvs -o+seg_monitor

cat <<-EOS>/etc/docker/daemon.json
{
  "storage-driver": "devicemapper",
  "storage-opts": [
     "dm.thinpooldev=/dev/mapper/docker-thinpool",
     "dm.use_deferred_removal=true",
     "dm.use_deferred_deletion=true"
  ]
}
EOS