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       upsd - UPS information server


       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  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.


       -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

       -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

       -u user
              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
       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

                   upsd : admin@
                   upsd : monslave@ monslave@

                   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)

   CGI programs:
       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),

   Internet resources:
       The NUT (Network UPS Tools) home page:

                                Mon Nov 30 2009