upsd(8)

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/

Opportunity

Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.

Education

Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.