Scott,
what most people do is look at /proc/1/cgroup and see whether it is '/'.
Since lxc and libvirt both tell init whether it is in a container, you
can also create an upstart job like:
description "track if this is lxc instance"
start on startup
env container
env LIBVIRT_LXC_UUID
pre-start script
if [ -z $container ]; then
if [ -z $LIBVIRT_LXC_UUID ]; then
stop
exit 0
fi
fi
end script
Then if, after boot, 'status islxc' shows
islxc start/running
you know you're in a container.
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https://bugs.launchpad.net/bugs/800856
Title:
resizefs module causes problems on LXC containers
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