[Nut-upsuser] Apple Mac slave

[Roger Price]

On Thu, 8 Jun 2017, Robbie van der Walle wrote:

>       The "upsrw" command contacts upsd, so it sounds like you should be able to add a user to upsd.users on the NAS, and then run something like
>       this on the Mac:
>
>         upsrw -s battery.charge.low=80 -u upsmaster -s sekret UPS at synology
>
>       Per http://networkupstools.org/docs/man/upsd.users.html , the "upsmaster" user would need at least "actions = SET". You will need to reload
>       upsd after changing upsd.users.
> 
> I managed to do this, upsc reports: 
> 
> battery.charge.low: 80 instead of 10 
> What is the purpose of changing this value?

When you carry out tests to ensure that the setup is working well, you 
will pull the power cord from the wall and wait until the UPS reaches LB. 
This means waiting and wasting time.  You can speed up the testing by 
setting LB very high so that the UPS reaches it quickly.  Later you can 
set a more reasonable value.

>       If the UPS is not turning itself off after the NAS goes into safe mode, it might be possible to do this from the Mac. You probably have
>       something like this in the Mac's upsmon.conf:
>
>         SHUTDOWNCMD "/sbin/shutdown -h +0"
>
>       You could add an UPS shutdown command before the Mac shutdown command:
>
>         upscmd -u upsmaster -s sekret UPS at synology shutdown.stayoff
>
>       but you would need to be sure that the UPS shutdown delay is long enough to allow the NAS to go into safe mode. (This is why it is
>       recommended that the master (the NAS in your case) initiate the UPS shutdown.) Also, you would need to configure that NUT user to allow
>       instant commands in upsd.users as well as upsrw access.
> 
> I have SHUTDOWNCMD "/sbin/shutdown -h +0” now on the Mac is was SHUTDOWNCMD “” before.

> How do I check if the UPS is turning itself off after the NAS goes into safe mode? 

On most UPS units, there is a light which goes out.  Some produce an 
audible clunk as the relays disconnect the UPS power outlets. You could 
also connect a light bulb to a protected outlet.  It should go out when 
the UPS shuts down.

Example test:

1. Pull power cord from wall

2. UPS beeps, NAS and Mac continue operation

3. Users are warned that power has failed

4. When the battery drops to battery.charge.low the slave (Mac) and then 
the master (NAS) shutdown.

5. After 20 seconds the UPS shuts down.

6. Reconnect the wall power

7. NAS and Mac should restart

You will also need a test in which you wait a long time before step 6, 
and a test in which you reconnect power between steps 4 and 5.

Roger