search

networkupstools / nut

The Network UPS Tools repository. UPS management protocol Informational RFC 9271 published by IETF at https://www.rfc-editor.org/info/rfc9271 Please star NUT on GitHub, this helps with sponsorships!
https://networkupstools.org/
Other
1.89k stars 342 forks source link

Hotplug USB device doesn't load driver #553

Open VasiliPupkin256 opened 6 years ago

VasiliPupkin256 commented 6 years ago

The nut driver is normally loaded during boot, if there was no UPS connected at boot time the driver will be terminated and will not start automatically if you plug it later. It can be fixed by adding RUN+="/bin/systemctl restart nut-server.service" to the 52-nut-usbups udev rules file.

jimklimov commented 6 years ago

For clarity, which NUT version (and OS) is this about? :)

At face value, restarting the nut-server is orthogonal to restarting a driver. It might however make visible the driver that was not available earlier (at least, if you configure new sections in ups.conf you should both start a new driver daemon and restart the nut-server which wraps upsd daemon), and/or such restart would quickly remove an existing known driver's "data stale" condition by starting life from scratch.

I hope my work on #330 does a good step toward automating much of these restarts (as well as allowing HW/SW dependencies to be tracked as for other OS services), and would welcome some real-life testing and feedback there ;)

VasiliPupkin256 commented 6 years ago

I am using rather old nut apparently 2.7.2 on ubuntu 16.04, if the release tag here is correct then the release is from 2014.

I choose to run restart nut-server.service because a daemon can't be started from the udev anyway, and it works, it also restart a driver and read the ups.conf changes as well. First I tried RUN+="/sbin/upsdrvctl start" and it didn't work

VasiliPupkin256 commented 6 years ago

My usecase: I've set everything up and turned off computer to do final cable management, when I've turned it on I realized that I forget to plug UPS USB cable, I've plugged it in but NUT didn't catch it and didn't load a driver for it.

Will the #330 solve this issue?