This is working to remove both warnings.
I'm 99% sure the real problem is that upsmon is trying to do things that are
now systemd's job.
You can see the "kill" log even there which suggests upsmon remains derp.
# Trying to fix these warnings:
# nut-monitor.service: Can't open PID file /run/nut/upsmon.pid (yet?)
after start: Operation not permitted
# nut-monitor.service: Supervising process 1287240 which is not our
child. We'll most likely not notice when it exits.
[Service]
RuntimeDirectory=nut
# Because /run/nut is shared by several nut units,
# do not erase it when THIS one ends.
# This might not be necessary, but
# I cannot easily tell, because
# I only run nut-monitor on this host!
RuntimeDirectoryPreserve=true
# Sigh, because upsmon starts as root then drops privs,
# it still fails to write to root:root /run/nut?
# Start upsmon as root:nut and make /run/nut root:nut.
# Maybe that will be enough to make thus STFU?
Group=nut
# <damjan> twb just remove PIDFile=
PIDFile=
cyber@light:~$ systemctl status nut-monitor
● nut-monitor.service - Network UPS Tools - power device monitor and shutdown
controller
Loaded: loaded (/lib/systemd/system/nut-monitor.service; enabled; vendor
preset: enabled)
Drop-In: /etc/systemd/system/nut-monitor.service.d
└─override.conf
Active: active (running) since Wed 2021-12-22 13:56:11 AEDT; 6min ago
Process: 1303859 ExecStart=/sbin/upsmon (code=exited, status=0/SUCCESS)
Main PID: 1303860 (upsmon)
Tasks: 2 (limit: 4653)
Memory: 896.0K
CPU: 17ms
CGroup: /system.slice/nut-monitor.service
├─1303860 /lib/nut/upsmon
└─1303861 /lib/nut/upsmon
Dec 22 13:56:11 light systemd[1]: Starting Network UPS Tools - power device
monitor and shutdown controller...
Dec 22 13:56:11 light upsmon[1303859]: kill: No such process
Dec 22 13:56:11 light upsmon[1303859]: UPS: up...@omega.cyber.com.au (slave)
(power value 1)
Dec 22 13:56:11 light upsmon[1303859]: Using power down flag file /etc/killpower
Dec 22 13:56:11 light upsmon[1303860]: Startup successful
Dec 22 13:56:11 light systemd[1]: Started Network UPS Tools - power device
monitor and shutdown controller.
Dec 22 13:56:11 light upsmon[1303861]: Init SSL without certificate database
