upsd Linux Service

upsd service:

NUT daemon and drivers. An uninterrupted power supply monitoring and reporting tool.
This tool reports to a central site to generate a database on ups statistics.
Now lets see the manual of upsd service.
Manual upsd:
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 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.
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.
-f
Stay in the foreground for testing.
-h
Display the help text.
-i interface
Bind the listening port to the interface specified by its Internet address. This may be useful on hosts with multiple interfaces. You should not rely exclusively on this for security, as it can be subverted on many systems.
-p port
Listen on TCP port port instead of the default value which was compiled into the code. This overrides any value you may have set with 'configure --with-port'. If you don't change it with configure or this switch, upsd will listen on port 3493.
-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.
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 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), cpsups(8), cyberpower(8), energizerups(8), etapro(8), everups(8), fentonups(8), genericups(8), ippon(8), isbmex(8), liebert(8), masterguard(8), mge-shut(8), mge-utalk(8), oneac(8), powercom(8), safenet(8), sms(8), snmp-ups(8), tripplite(8), tripplitesu(8), victronups(8),
Internet resources:
The NUT (Network UPS Tools) home page: http://www.networkupstools.org/
REFERENCED BY
upsct(8), upsct2(8), upsmon.conf(5), upsset.conf(5)