magnum/releasenotes/notes/no-cinder-volume-87b9339e06...

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---
prelude: >
Currently, the swarm and the kubernetes drivers use
a dedicated cinder volume to store the container
images. It was been observed that one cinder volume
per node is a bottleneck for large clusters.
fixes:
- Make the dedicated cinder volume per node an opt-in
option. By default, no cinder volumes will be created
unless the user passes the docker-volume-size argument.