Turns out that the /etc/network/interfaces stuff I mentioned before was
a red herring, here is the actual problem.
Without overlayroot the (nfs) root filesystem is mounted at /, and on
reboot/shutdown /etc/init.d/umountnfs.sh will skip that mount point when
unmounting the network file systems (because of lines 49 & 50 of
/etc/init.d/umountnfs.sh).
With overlayroot enabled, the "root" filesystem is mounted at /, but the
nfs mount that is "under" the overlay is mounted at /media/root-ro,
which is NOT skipped during reboot/shutdown.
The fix I have in place is to change line 49 of /etc/init.d/umountnfs.sh
from:
/|/proc|/dev|/dev/pts|/dev/shm|/proc/*|/sys|/run|/run/*)
to:
/|/proc|/dev|/dev/pts|/dev/shm|/proc/*|/sys|/run|/run/*|/media/root-
ro)
And I am able to reboot/shutdown properly.
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https://bugs.launchpad.net/bugs/1165886
Title:
overlayroot prevents shutdown / reboot under nfsroot
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