[Nut-upsuser] Problem installing NUT on 16.04

[Charles Lepple]

> On Dec 9, 2016, at 10:40 PM, Jack McGee wrote:
> 
> ● nut-server.service - LSB: Network UPS Tools initscript
>    Loaded: loaded (/etc/init.d/nut-server; bad; vendor preset: enabled)
>    Active: active (running) since Fri 2016-12-09 13:48:34 CST; 7h ago
>      Docs: man:systemd-sysv-generator(8)
>   Process: 1886 ExecStart=/etc/init.d/nut-server start (code=exited, status=0/SUCCESS)
>    CGroup: /system.slice/nut-server.service
>            └─2082 /lib/nut/usbhid-ups -a CyberUPS1
> 
> Dec 09 13:48:33 amethi systemd[1]: Starting LSB: Network UPS Tools initscript...
> Dec 09 13:48:33 amethi nut-server[1886]:  * Starting NUT - power devices information server and drivers
> Dec 09 13:48:34 amethi usbhid-ups[2082]: Startup successful
> Dec 09 13:48:34 amethi upsd[2083]: not listening on 192.168.0.105 port 3493
> Dec 09 13:48:34 amethi upsd[2083]: listening on 127.0.0.1 port 3493
> Dec 09 13:48:34 amethi upsd[2083]: no listening interface available

Wait, when you say "NUT cannot connect to the UPS", which part are you referring to?

The error you posted before from the driver looked like something else was already connected to the UPS. Only one copy of the driver can be running, and the log quoted above shows that it is (PID 2082). There is supposed to be logic in the driver to detect that a copy is already running, and to send a termination signal to that before trying to continue.

However, if you get a "Connection Refused" error, then upsd is not listening on port 3493 yet. The last three lines above indicate that it couldn't bind to 192.168.0.105, so if a restart fixes that, then I guess systemd isn't properly waiting for the network to come up. Maybe someone else has a suggestion for that, but for me, the path of least resistance would be to listen on 0.0.0.0 and use a firewall rule to limit connections to that subnet.