bionic (8) upsd.8.gz

Provided by: nut-server_2.7.4-5.1ubuntu2_amd64 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/