Provided by: nut-server_2.6.3-1ubuntu1_i386 bug

NAME

       upsd - UPS information server

SYNOPSIS

       upsd -h

       upsd [OPTIONS]

DESCRIPTION

       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 back to the
       drivers, such as starting tests, or setting values.

       Communication between upsd and clients is handled on a TCP port.
       Configuration details for this port are described in upsd.conf(8).

       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.

OPTIONS

       -c command
           Send command to the background process as a signal. Valid commands
           are:

           reload
               reread configuration files

           stop
               stop process and exit

       -D
           Raise the debug level. Use this multiple times for additional
           details.

       -h
           Display the help text.

       -r directory
           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
           nutupsdrv(8).

       -u user
           Switch to user user after startup if started as root. This
           overrides whatever you may have compiled in with configure
           --with-user.

       -V
           Display the version of the program.

RELOADING

       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.

DIAGNOSTICS

       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
       starting upsd.

       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.

ACCESS CONTROL

       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
       server. Further details are described in hosts_access(5).

FILES

       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).

ENVIRONMENT VARIABLES

       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(5) overrides this variable.

SEE ALSO

   Clients:
       upsc(8), upscmd(8), upsrw(8), upslog(8), upsmon(8)

   CGI programs:
       upsset.cgi(8), upsstats.cgi(8), upsimage.cgi(8)

   Drivers:
       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),

   Internet resources:
       The NUT (Network UPS Tools) home page: http://www.networkupstools.org/