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A data volume container is far superior to bind mounting the
host's shared directories. It preserves the idempotency,
immutability and declarative properties of the containers.
The way this works in practice is that a data volume container is
created. Then when the containers start they use LVM to access
the filesystem where /var/lib/docker is contained. Then the
container startup logic bindmounts the data volume stored on the
host filesystem in /var/lib/docker/vfs/dir/ID. This prevents
people with access to the host operating system from damaging
the contents of the data container.
It does mean that now we must use tools/stop to stop our containers
rather than tools/cleanup-containers -f.
This is a containers best practice. For more details see:
https://docs.docker.com/userguide/dockervolumes/
Big credit goes to Danyeon Hansen for seeding this idea in the
mariadb containers.
Note occasionally docker-compose start/stop seems to not want to stop
a container. This bug needs to be addressed upstream separately
from our utilization of this best practice.
Change-Id: Iaa1419f606e1b1b7a7560a095c49e79d643164f1
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