Hi,
subject pretty much says it all. I am currently working on an embeded
system and wish to use systemd in both the rootfs and the initramfs.
These are both built via buildroot, making a full rootfs for one and a
minimal rootfs for the other. However the documentation on how to make a
proper initramfs seems to be very sparse, and I wish to understand this
process better. Note that I am manually creating a cpio archive
containing a minimal OS in this case, as buildroot can't make use of
dracut or any tools to generate a proper initramfs. I did get quite far
already, but I'm still missing one important thing it seems.
I am using systemd 242 in both initramfs and full rootfs. The rootfs is
a squashfs filesystem, hence read-only. I wish to use the new overlayfs
support to provide a writable layer on top of the filesystem, and I do
think I've gotten it working quite well. However I don't know if this is
as a result of using 'systemd.volatile=overlay' on my kernel command
line, or if I really am missing something inside my initramfs, but when
the initramfs terminates itself and switches to the real root, obviously
systemd-journald is getting killed and then a new one spawns in the real
root, with all the messages from the boot to the termination of the
initramfs missing if I consult journalctl. The journal on the real root
starts off with 'Received sigterm from PID 1'. So, what is going on
here, and how could I fix this ?
The only documentation I found was about the boot up process in man
bootup(7), and some kind of wiki article on freedesktop describing the
initrd interface of systemd which seemed rather vague, located at
https://www.freedesktop.org/wiki/Software/systemd/InitrdInterface/
. I'd really appreciate any insight into this, and would be glad to
document the process in the end, for other people possibly struggling
with the same use case as I.
Thanks !
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