Kushal Das

FOSS and life. Kushal Das talks here.

Setting up storage for docker on Fedora22 cloud image

docker-storage-setup helps to create a LVM thin pool, which can be then used by docker for storage of containers, and images. By starting docker, it automatically starts this service. We can also make sure that it uses a specific block device, and volume group. In this example I am running Fedora 22 Cloud Base image on an Openstack environment, I added a new volume /dev/vdb to the instance.

# cat <<EOF > /etc/sysconfig/docker-storage-setup
DEVS=/dev/vdb
VG=docker-vg
EOF
# sudo docker-storage-setup
  Volume group "vda1" not found
  Cannot process volume group vda1
Checking that no-one is using this disk right now ... OK

Disk /dev/vdb: 5 GiB, 5379194880 bytes, 10506240 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xc8ed8872

Old situation:

>>> Script header accepted.
>>> Created a new DOS disklabel with disk identifier 0x39ca0d62.
Created a new partition 1 of type 'Linux LVM' and of size 5 GiB.
/dev/vdb2: 
New situation:

Device     Boot Start      End  Sectors Size Id Type
/dev/vdb1        2048 10506239 10504192   5G 8e Linux LVM

The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
  Physical volume "/dev/vdb1" successfully created
  Volume group "docker-vg" successfully created
  Rounding up size to full physical extent 8.00 MiB
  Logical volume "docker-poolmeta" created.
  Logical volume "docker-pool" created.
  WARNING: Converting logical volume docker-vg/docker-pool and docker-vg/docker-poolmeta to pool's data and metadata volumes.
  THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)
  Converted docker-vg/docker-pool to thin pool.
  Logical volume "docker-pool" changed

I hope this will help you to setup the docker storage properly on Fedora 22 Cloud Image.

comments powered by Disqus