I see Florian asked this a few weeks ago:
http://sourceforge.net/mailarchive/forum.php?thread_name=500ECF6C.5020709%40ubuntu.com&forum_name=lxc-users
I just hit the same problem. I had been hoping to install a bunch of
packages inside the ephemeral container, and of course now I'm
running out of disk space.
So that's one more requirement discovered: I need lxc-start-ephemeral
to support nontrivial amounts of disk storage, more than will
fit in tmpfs.
Maybe I'll add an argument "--overlaydir PATH" for where to store the files;
if that's set, setup_container() will use that rather than doing
OVERLAY_DIR=`mktemp -d /tmp/lxc-lp-XXXXXXX`
sudo mount -t tmpfs none $OVERLAY_DIR
For safety, I would create a subdirectory inside the specified directory,
and use that for $OVERLAY_DIR. That would let me clean up
that directory before and after runs without worrying about
accidentally destroying the host system if the user makes a typo.
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