02-21-2016
Depending what you want to monitor SNMPv3 could satisfy your needs.
You will need to install 'something' tho, in this case net-snmp, but you won't be installing any 'agents'.
(I do not condone agents, especially closed source ones.)
Also net-snmp is already present on most linux/unix machines, it will need some configuration love, but not much (creating users, disabling public community strings and alike).
On the external node you will have to setup something to send snmp requests.
Various software exists, a lot of it is free (Cacti, Nagios and alike) which will graph performance (RRD tool) and send alerts when thresholds are breached.
Hope that helps
Regards
Peasant.
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LEARN ABOUT REDHAT
snmp-ups
snmp-ups(8) Network UPS Tools (NUT) snmp-ups(8)
NAME
snmp-ups - Driver for RFC 1628 SNMP UPS equipment
NOTE
This man page only documents the hardware-specific features of the snmp-ups driver. For information about the core driver, see nutups-
drv(8).
SUPPORTED HARDWARE
Any UPS that is RFC 1628 (UPS MIB) compliant.
EXPERIMENTAL DRIVER
This driver has been tagged experimental and is not built by default.
REQUIREMENTS
This driver needs UCD SNMP, aka Net-SNMP installed to compile successfully. See http://www.net-snmp.org/ for more information.
On Red Hat 7.2, these packages are required:
ucd-snmp-devel-4.2.3-1, ucd-snmp-4.2.3-1, ucd-snmp-utils-4.2.3-1
You must install SNMP-UPS-MIB.txt in your MIBs directory - typically /usr/share/snmp/mibs/, but it may vary from system to system. You can
generate this from chapter 4 of RFC 1628 (see http://www.faqs.org).
EXTRA ARGUMENTS
This driver supports the following optional settings in the ups.conf(5):
community=name
Set community name (default = public)
snmp_version=version
Set SNMP version (default = v1, the other allowed value is v2c)
INSTALLATION
This driver is not built by default. You can build it by using "configure --with-drivers=snmp-ups" before calling make.
IMPLEMENTATION
The hostname of the UPS is specified with the "port" value in ups.conf, i.e.:
[snmp]
driver = snmp-ups
port = snmp-ups.example.com
community = public
snmp_version = v1
SUPPORTED VARIABLES
INFO_MFR UPS Manufacturer
INFO_MODEL UPS Model
INFO_FIRMREV Firmware/Software Version
INFO_STATUS OFF, OL, OB, BOOST, TRIM
INFO_BATTPCT Battery percentage
INFO_RUNTIME Predicted runtime on battery
INFO_BATTVOLT Battery Voltage
INFO_OUTVOLT Output Voltage
PLANNED SUPPORT
INFO_UTILITY Input Voltage
INFO_ACFREQ AC Frequency
INFO_UPSTEM UPS Temperature
INFO_LOADPCT Load Percentage
CMD_? Not determined
AUTHORS
Arnaud Quette, Hans Ekkehard Plesser
SEE ALSO
The core driver:
nutupsdrv(8)
Internet resources:
The NUT (Network UPS Tools) home page: http://www.exploits.org/nut/
NUT mailing list archives and information: http://lists.exploits.org/
Tue Oct 22 2002 snmp-ups(8)