I am diskless booting Rocky Linux 9 , using an NFS mounted root. This
works OK so far. However, I want to mount /etc/ as a tmpfs and load up a
bunch of config files, then have systemd see the (new)
/etc/systemd/system and use that in the rest of the boot process,
bringing up some non-default services etc.
I have a service that does the creation and copying of /etc which runs
from local-fs-pre.target.wants:
$ cat nber-rc-initdiskless.service
[Unit]
Description=Run NBER diskless setup including /sbin/copy_conf
DefaultDependencies=no
Before=local-fs-pre.target
After=initrd-switch-root.service plymouth-switch-root.service
OnFailure=emergency.target
OnFailureJobMode=replace-irreversibly
AssertPathExists=/etc/rc.initdiskless
[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/bin/bash /etc/rc.initdiskless
ExecStart=systemctl daemon-reload
StandardOutput=journal+console
StandardError=journal+console
[Install]
WantedBy=local-fs-pre.target
I then have for example
/etc/systemd/system/multi-user.target.wants/autofs.service ->
/usr/lib/systemd/system/autofs.service
As soon as the system is up I can ssh in and run systemctl start autofs
and it works just fine. In journalctl -b I can see my rc.initdiskless
running followed by the daemon-reload. But no autofs and no evidence
that systemd tried to start autofs.
My only guess is that somehow daemon-reload is not enough because as far
as systemd is concerned we already queued up for starting all the
services needed by multi-user.target back when we switched root from the
initrd.
Hopefully it is something obvious that I am missing. Thanks in advance
for any help,
- Alex Aminoff
NBER
