[Nut-upsuser] Master Works, Slave Does Not

Steve Read
Sat, 08 Nov 2014 15:34:05 -0000

Thank you Charles, I am hoping fiddle with that sometime today or tomorrow.
But I have another question, when you ask me to modify various files I am
confused as to weather you mean on the server, client or both?
So in your statement:
"Instead, you want to listen on the wildcard address, so you will want to
add "LISTEN 0.0.0.0" to /etc/nut/upsd.conf. After restarting NUT,
netstat should look like this:"
I think you mean the client?

Steve


Subject: Re: [Nut-upsuser] Master Works, Slave Does Not
From: clepple at gmail.com
Date: Sat, 8 Nov 2014 09:00:12 -0500
CC: nut-upsuser at lists.alioth.debian.org
To: sd_read at hotmail.com

[Please use reply-all to keep the discussion on the list, thanks]

On Nov 6, 2014, at 10:19 PM, Charles Lepple <clepple at gmail.com> wrote:

On Nov 6, 2014, at 12:48 PM, Steve Read <sd_read at hotmail.com> wrote:

I am presently upgrading my servers. The old ones are running Suse 10.1 and I am
upgrading to the most  recent Debian.

What version of NUT on the new systems?

There are a few changes to the configuration files, mostly related to the ACL
lines.

You mentioned you got "driver.version: 2.6.4" from upsc. So it seems
like you have Debian wheezy. Is that the case for both servers?

(What I was really interested in was the output of "dpkg -l nut",
since it shows the Debian-specific version number as well, but wheezy hasn't
changed much. There are a few things still being sorted out in Debian jessie.)

Now this may be a problem but I don't think it is the only one. I really
feel this is a permissions issue.

For example from the master, if I type:
   root at backup2:~# sudo upsc sdrups at localhost ups.status
    OL

Which is the response I expect, but if I type (also from the master):
  root at backup2:~# sudo upsc sdrups at 192.168.0.7 ups.status
  Error: Connection failure: Connection refused

One thing that has changed since NUT 2.4.x is that the ACL options were removed,
and the defaults for the LISTEN directive were changed to only bind to
localhost. So a "netstat -ta" (trimmed to just show NUT) would look
like this:

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
...
tcp        0      0 localhost:nut           *:*                     LISTEN

Instead, you want to listen on the wildcard address, so you will want to add
"LISTEN 0.0.0.0" to /etc/nut/upsd.conf. After restarting NUT, netstat
should look like this:
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
...
tcp        0      0 *:nut                   *:*                     LISTEN

And at that point, you can use the firewall rules to restrict access to just
localhost and your local network.
If you were able to get output from upsc, then it sounds like you got the driver
working. Just in case, here is the UPGRADING document:
https://github.com/networkupstools/nut/blob/master/UPGRADING
Some drivers (apcsmart) have had under-the-hood changes that should be more
beneficial than problematic.
Also, Stan mentioned the following off-list, and it holds true:
upsmon.conf should have a line like this

MONITOR apcusb at 192.168.1.235 1 upsmon pass slave

upsd.users should have a matching statement like this

       [upsmon]
               password  = pass
#               upsmon master
# or
               upsmon slave

The only configuration files that a slave needs are upsmon.conf, nut.conf to
tell the init.system that it is a slave, and possibly an upssched.conf if you
haven enabled that. The others are master-only.
--
Charles Lepple
clepple at gmail




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