On 6/17/22 11:55, PeReZ via Nut-upsuser wrote:
I need to manage two UPSes but my host can set and monitor only one.
why only one ?
So I thinked to install NUT UPS on a Raspberry to monitor both UPSes
and to create a dummy ups.
The two UPSes are identical and both have LAN cards but I can connect
them via USB if desiderable.
All the UPSes I know that have LAN cards support SNMP so -- assuming
yours do not deviate from this - you should be able to monitor both of
them directly from any computer that can speak SNMP. You do not need the
PI or the dummy UPS.
Can I connect the Raspberry to the host via USB for dummy UPS
communications?
The dummy ups should do:
- notify ON_BATTERY if both UPSes are on battery
- if both go on LOW battery, change its status to LOW battery also
- send a shutdown comamnd to both UPSes with a delay of 5 minutes so
the host can gracefully stops all VMs and itself
- turn off the Raspberry?
The NUT server should send notifications on real status of both UPSes
via mail.
Is it possible?
I guess it is but I fail to understand why do you complicate your life
with this approach instead of monitoring both UPS via SNMP and maybe
using setting two semaphores ( one per UPS ) and doing a logical AND
between the conditions with a simple script written in any language of
your choice.
wolfy
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