On Fri, May 23, 2014 at 01:34:26PM -0400, Joey Hess wrote:
Hmm, AFAICS the aufs mounts are not unique volumes, at least they show
as the same size as the root filesystem:
/dev/sda1 38G 29G 7.2G 80% /
none 38G 29G 7.2G 80%
/var/lib/docker/aufs/mnt/81abbf65e1935a6754e11276c044b94012082304f247be1b70306fa7dfda3650
none 38G 29G 7.2G 80%
/var/lib/docker/containers/81abbf65e1935a6754e11276c044b94012082304f247be1b70306fa7dfda3650/root
They're the same baseline filesystem, but aufs lets you merge
filesystems and redirect writes so they're logically different. (And,
presumably, they may consume storage differently in other cases than
yours and someone may want to see that via df.) I'd assume that they've
got different device IDs (stat -c %d /mnt/whatever) unlike bind mounts,
which are exactly the same filesystem. (df uses the device IDs to
determine which filesystems are duplicates.)
Mike Stone
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