container-storage-setup Allow partition devices in DEVS=

Right now docker-storage-setup does not allow partition devices in DEVS=. For people who don't use lvm on root disk and don't create a volume group, this can be problematic. Now they don't have an extra disk and they can create a paritition on root disk and pass to dss.

If we allow partition devices in DEVS=, then one can easily create a partition on root disk and use that to carve out thin pool.

Jul 31 '15 14:07 rhvgoyal

Some AWS instance are created from EBS and have no "root filesystem" LVM VG associated with it. So we have: |<- boot partition->|<--root partition--.....>| So we may need to partition the "root" partition into 2 partitions: one for the kernel use and one to be used as block storage for devicemapper lvm-direct thinpool: |<- boot partition->|<--root partition-->|<---free block partition for LVM VG--->|

Note: See an example here: http://kumar-pravin.blogspot.com/2015/10/setting-up-storage-to-make-docker.html

Jul 14 '17 19:07 bklau

So if you have a separate partition, you can simple create a volume group with that partition and pass that volume group to docker-storage-setup?

Say you have /dev/vdc1 partition free. Then do vgcreate docker-vg /dev/vdc1 and pass VG=docker-vg in /etc/sysconfig/container-storage-setup.

Jul 17 '17 19:07 rhvgoyal

Yes! The partition must be marked as "8e" partition type which is "Linux LVM"

Jul 17 '17 19:07 bklau