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           upsd -h
           upsd [OPTIONS]


           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.


           -c command
               Send command to the background process as a signal. Valid commands
                   reread configuration files
                   stop process and exit
               Raise the debug level. Use this multiple times for additional
               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
           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
           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.


           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).


           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(5) overrides this variable.


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

    Network UPS Tools 10/09/2011 UPSD(8)


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