Hello, We would like to have a ROFS volume on which the whole fs is and writeable config volume on which with have the same /etc. Current kernel is 5.11 I have done an /etc/ overlay using the service var-volatile-etc for the RO FS. And then added another service to either mount the config /etc on top of the /etc overlay when the config volume is rw or mount the config volume to a temp directory and then overlay it to the /etc/ overlay when the volume is RO.
It seems to be working as I am able to disable our services (bit, sensor) on config volume and they don't start. Also the OOB address is assigned from the configuration file. Then I found https://lists.freedesktop.org/archives/systemd-devel/2019-February/042151.html further below in quote: So is it my understanding that as long as the mount or overlay happen early enough which is around the service for var-volatile-etc then there is a rescan and all config from the /etc in the volume will be used then? Following the thread, I also saw that it is advised to use initramfs. I am not clear why that makes a difference. This thread being 2 year old there may thing I am not aware of. Cheers. "> I have an embedded system with a readonly rootfs. > > I've setup a very early service that mounts a writable aufs overlay over > /etc/. > > > The problem I'm having is systemd is not starting any services that I have > enabled in that overlay that were not initially enabled in the readonly > rootfs. > > ?I've tried placing a calls to systemctl daemon-reload or systemctl > daemon-reexec just after mounting the overlay but the services are not > started, after the fact systemctl will report that the services are enabled > but inactive. > If you are doing it as part of normal startup, then systemd has already computed initial "transaction". While daemon-reload makes it rescan for and see additional unit definitions, it does not change currently running "transaction"." Cheers, Renaud
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