It seems, you're right with the final path component in --overlay. This
is the absolute path *inside* the container. I looked into nspawn's
source code and the options is interpreted as follows
--overlay=lo1:lo2:up:dest
lo1 and lo2 are lower directories, up is the upper directory in
overlayfs terms, and all are absolute host directory paths. dest is the
where the overlayfs is mounted inside the container's root directory.
In order to use --overlay, I have to say
--overlay=/path/to/xenial/usr:/path/to/apache/usr:/path/to/container/usr:/usr
and repeat this for /etc, /bin, /sbin, /lib, /lib64, /var.
So --overlay seems to work, sort of.
Anyway, thank you for pushing me into the right direction. I think, I'll
stay with my workaround, overlay mounting the base directories upfront,
and then nspawning the container on the resulting root directory.
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https://bugs.launchpad.net/bugs/1594849
Title:
systemd-nspawn: option --overlay not working
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