[atomic-wg] Issue #186 `switch to overlay2`

[Pagure]

vgoyal added a new comment to an issue you are following:
``
Upstream dokcer-storage-setup will continue to have devicemapper as default graph driver. So for this to work properly on atomic host, we probably require following two options set in /etc/sysconfig/docker-storage-setup.

STORAGE_DRIVER=overlay2
DOCKER_ROOT_VOLUME=yes

By default, a logical volume will be created which will consume 40% of free space. Remaining will remain free and can be used for growing either rootfs or docker logical volume. But growing step is manual and there is no automation.
``

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https://pagure.io/atomic-wg/issue/186