Nut upsuser - Jun 2016 - What is the purpose of the upsmon setting in upsd.users?

Hi list,

(I think) I understand that in upsmon.conf, the MONITOR line ends with
"master" or "slave". Basically if it's master it will
wait for slaves to
shut down and if it's slave it will signal the master to switch off the UPS
after shutdown.

To be able to monitor a network UPS as a slave, there must be a user in
upsd.users on the master system. This user needs to have a setting named
"upsmon" set.

And this is where I'm confused - this setting has a parameter that must also
be set to either " master" or "slave". What do I set this
to?

Regards,
Andr?

On Mittwoch, 22. Juni 2016 09:21 Andr? wrote:
> Hi list,
> 
> (I think) I understand that in upsmon.conf, the MONITOR line ends with
"master" or "slave". Basically if it's master it will
wait for slaves to
shut down and if it's slave it will signal the master to switch off the UPS
after shutdown.
> 
> To be able to monitor a network UPS as a slave, there must be a user in
upsd.users on the master system. This user needs to have a setting named
"upsmon" set.
> 
> And this is where I'm confused - this setting has a parameter that must
also be set to either " master" or "slave". What do I set
this to?
> 
> Regards,
> Andr?
Ok, I did some further testing and it seems that setting "upsmon
slave" does
not allow clients to connect, so when would I want to set it?

[please use reply-all when responding - the list does not mangle reply-to
headers. thanks!]

On Jun 22, 2016, at 4:06 AM, Andr? H?nsel wrote:
> 
> On Mittwoch, 22. Juni 2016 09:21 Andr? wrote:
> 
>> Hi list,
>> 
>> (I think) I understand that in upsmon.conf, the MONITOR line ends with
>> "master" or "slave". Basically if it's master
it will wait for slaves to
>> shut down and if it's slave it will signal the master to switch off
the UPS
>> after shutdown.
if it is a slave, it *allows* the master to switch off the UPS. I am not
familiar with the exact sequence of events if there is no master upsmon process.

https://github.com/networkupstools/nut/blob/master/clients/upsmon.c#L615
>> 
>> To be able to monitor a network UPS as a slave, there must be a user in
>> upsd.users on the master system. This user needs to have a setting
named
>> "upsmon" set.
>> 
>> And this is where I'm confused - this setting has a parameter that
must
>> also be set to either " master" or "slave". What do
I set this to?
>> 
>> Regards,
>> Andr?
> 
> Ok, I did some further testing and it seems that setting "upsmon
slave" does
> not allow clients to connect, so when would I want to set it?
> 
The "upsmon slave" setting should not prevent clients from connecting.
Can you provide more details about the system? If this is a distributor-provided
package, did they link against TCP-wrappers (using /etc/hosts.deny)?

-- 
Charles Lepple
clepple at gmail