upsd - UPS information server
upsd is responsible for serving the data from the drivers to the
clients. It connects to each driver and maintains a local cache of the
current state. Queries from the clients are served from this cache, so
delays are minimal.
It also conveys administrative messages from the clients such as
starting tests or setting values back to the drivers.
This program is essential, and must be running at all times to actually
make any use out of the drivers and clients.
Controls in the configuration files allow you to limit access to the
server, but you should also use a firewall for extra protection.
Client processes such as upsmon(8) trust upsd for status information
about the UPS hardware, so keep it secure.
Send command to the background process as a signal. Valid
reload - reread configuration files
stop - stop process and exit
-D Raise the debug level. Use this multiple times for additional
-h Display the help text.
upsd will chroot(2) to directory shortly after startup and
before parsing any configuration files with this option set.
You can use this to create a "jail" for greater security.
You must coordinate this with your drivers, as upsd must be able
to find the state path within directory. See upsdrvctl(8) and
Switch to user user after startup if started as root. This
overrides whatever you may have compiled in with 'configure
-V Display the version of the program.
upsd can reload its configuration files without shutting down the
process if you send it a SIGHUP or start it again with '-c reload'.
This only works if the background process is able to read those files.
If you think that upsd can't reload, check your syslogs for error
messages. If it's complaining about not being able to read the files,
then you need to adjust your system to make it possible. Either change
the permissions on the files, or run upsd as another user that will be
able to read them.
DO NOT make your upsd.conf or upsd.users world-readable, as those files
hold important authentication information. In the wrong hands, it
could be used by some evil person to spoof your master upsmon and
command your systems to shut down.
upsd expects the drivers to either update their status regularly or at
least answer periodic queries, called pings. If a driver doesn't
answer, upsd will declare it "stale" and no more information will be
provided to the clients.
If upsd complains about staleness when you start it, then either your
driver or configuration files are probably broken. Be sure that the
driver is actually running, and that the UPS definition in ups.conf(5)
is correct. Also make sure that you start your driver(s) before
Data can also be marked stale if the driver can no longer communicate
with the UPS. In this case, the driver should also provide diagnostic
information in the syslog. If this happens, check the serial or USB
cabling, or inspect the network path in the case of a SNMP UPS.
If the server is build with tcp-wrappers support enabled, it will check
if the NUT username is allowed to connect from the client address
through the /etc/hosts.allow and /etc/hosts.deny files. Note that this
will only be done for commands that require to be logged into the
upsd : email@example.com/32
upsd : firstname.lastname@example.org/32 email@example.com/24
upsd : ALL
Further details are described in hosts_access(5).
The general upsd configuration file is upsd.conf(5). The
administrative functions like SET and INSTCMD for users are defined and
controlled in upsd.users(5). UPS definitions are found in ups.conf(5).
NUT_CONFPATH is the path name of the directory that contains upsd.conf
and other configuration files. If this variable is not set, upsd uses
a built-in default, which is often /usr/local/ups/etc.
NUT_STATEPATH is the path name of the directory in which upsd keeps
state information. If this variable is not set, upsd uses a built-in
default, which is often /var/state/ups. The STATEPATH directive in
upsd.conf overrides this variable.
upsc(8), upscmd(8), upsrw(8), upslog(8), upsmon(8)
upsset.cgi(8), upsstats.cgi(8), upsimage.cgi(8)
nutupsdrv(8), apcsmart(8), belkin(8), belkinunv(8), bestuferrups(8),
bestups(8), cyberpower(8), energizerups(8), etapro(8), everups(8),
genericups(8), isbmex(8), liebert(8), masterguard(8), mge-shut(8),
mge-utalk(8), oneac(8), powercom(8), safenet(8), snmp-ups(8),
tripplite(8), tripplitesu(8), victronups(8),
The NUT (Network UPS Tools) home page: http://www.networkupstools.org/
Mon Nov 30 2009