Re: [gentoo-user] problems getting systemd to work

["Jc García" <jyo.garcia@gmail.com>]

2014-05-12 4:15 GMT-06:00  <covici@ccs.covici.com>:

> How can I do this, genkernel looks for its init before it mounts /usr
> and genkernel-next will not mount the separate /usr at all.  My latest
> initrd is from the very latest genkernel.
>
> But how to get a complete history of systemd actions in the order that
> they are done, I thought the confirm_spawn would do this for me -- at
> least for my initial debugging.
>

I have had this trouble too, and a very similar setup than you, and
after a few workarounds I got to boot with a genkernel and a dracut
generated initramfs, so it can be done both ways, but i would
recommend dracut, since is more straight forward in practice, and you
can setup once and then just generate initramfs that surely will work.
The most important part is your kernel boot comand line, giving
instructions so your system specific lvm volumes (root, usr and var if
separated). mine looks like this
"rd.lvm rd.lvm.vg=gentoovg rd.lvm.lv=gentoovg/root
rd.lvm.lv=gentoovg/usr root=/dev/mapper/gentoovg-root
ccinit=/usr/lib/systemd/systemd quiet"
A little too long in my opinion, but works, and the rd.lvm.lv parts
result redundant if rd.lvm.vg is already set, i think, it worked when
I tested, but I kept the redundancy just in case.
this can be setup in sevaral ways, directly when compiling the kernel,
using dracut the config file, or the bootloader, I used dracut since I
wanted to centralize the boot process configuration as much as
possible.
Also be sure that the lvm binaries are included in the initramfs, if
you will be using dracut you would need to add to /etc/dracut.conf:

use_fstab="yes"
host_cmdline="yes"
kernel_cmdline="your_cmd_line"