[systemd-devel] starting a service before anything else....
MALET Jean-Luc
jeanluc.malet.snowsat at gmail.com
Thu Jun 28 14:55:35 UTC 2018
Hi!
I'm in charge of setting up an embedded solution based on debian, so on
systemd, I'm more used to old init process, that was easy to tweak
because based on script... but well... times seems now on systemd.
I'm really puzzled because since the documentation seems to lack
information, I have to find information on tutorials that focus only on
late services..
I found on one how to find the targets using "systemctl list-units
--type=target" and some diagram explaining what target are suposed to be
run in what order.... but well...
my issue is that I've to run a script as early as possible, before
mounts are done because lot of service will fail without , so I created
a service
[Unit]
Description=mount some file systems before anything and prepare the system
Before=systemd-remount-fs.service
[Service]
Type=oneshot
ExecStart=/etc/init.d/setup.sh start
[Install]
WantedBy=swap.target
using journalctl I found that the first Reached point was the
swap.target so it looked like a good WantedBy, but looking at the
journalctl showed that the service was still not run in early systemd
steps... so I added a Before rule using the "systemctl list-units
--type=service" to guess what service where run on the system... and
well... it's not working as expected... I still see my service run after
some other services...
on sysV init, it was easy to track down what would be run and assign
order... here I'm puzzled because there are only partial information
from tutorials and it's not clear what will be run, what is the entry
point target, how to list the dependencies since some are hidden and
built in...
so can you help me? how can I run my service (before it was run in rcS
script, so that we were sure that it was the first thing done....)
thanks
JLM
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