Ubuntu Manpage: upsdrvsvcctl - UPS driver service instance controller

NAME

       upsdrvsvcctl - UPS driver service instance controller

SYNOPSIS

       upsdrvsvcctl -h

       upsdrvsvcctl [OPTIONS] {start | stop } [ups]

DESCRIPTION

upsdrvsvcctl provides a uniform interface for controlling your UPS drivers wrapped into
service instances on platforms which support that (currently this covers Linux
distributions with systemd and systems derived from Solaris 10 codebase, including
proprietary Sun/Oracle Solaris and numerous open-source illumos distributions with SMF).
It may be not installed in packaging for other operating systems.

When used properly, upsdrvsvcctl lets you maintain identical startup scripts across
multiple systems with different UPS configurations.

The goal of this solution is to allow the services of upsd data server to start up even if
some of the power devices are currently not accessible, and for NUT drivers to be
automatically restarted by the system in case of problems (driver bug, startup failure).
It also allows for faster startup of systems which monitor several devices, by letting
each driver to start in parallel with others, and not with a sequential loop like was done
previously.

Independent service instances for each NUT driver also allow one to configure further
dependencies, such as that networking must be available for SNMP and similar drivers (but
is not needed for local-medium drivers such as serial or USB).

The old monolithic "all or nothing" solution requiring that all drivers must be running,
which sufficed for deployments with a few UPSes, did not really work well for monitoring
larger deployments. It was also not easy to strike a pre-packaged balance between early
UPS protection for USB/serial home setups vs. waiting for network on larger ones.

upsdrvsvcctl is a script which mimics the operation of upsdrvctl program (where possible)
to provide similar end-user experience when manipulating drivers wrapped into service
instances rather than as directly executed daemons. It relies on nut-driver-enumerator.sh
for a large part of actual operations.

You should use upsdrvsvcctl instead of direct calls to the drivers and daemon-based
management with upsdrvctl whenever possible (that is, for "production" use on compatible
OSes). Otherwise (testing, other OSes) the upsdrvctl is a recommended option.

OPTIONS

       -h
           Display the help text.

       -t
           Enable testing mode. Testing mode makes upsdrvsvcctl display the actions it would
           execute without actually doing them.

OPTIONS OF UPSDRVCTL NOT (CURRENTLY) APPLICABLE TO UPSDRVSVCCTL

       Options like -r, -u or -D could be handled by properties of the service instances
       themselves, with this script helping to configure them (assuming proper privileges of the
       user who called it). This is not a "production" use case, though, to change such options
       on a configured system — so for experiments and troubleshooting, it may be better to stop
       the service instance and play with upsdrvctl directly.

       -r directory
           If starting a driver, this value will direct it to chroot(2) into directory. This can
           be useful when securing systems.

       This may be set in the ups.conf with "chroot" in the global section.

       -u username
           If starting a driver, this value will direct it to setuid(2) to the user id associated
           with username.

       If the driver is started as root without specifying this value, it will use the username
       that was compiled into the binary. This defaults to "nobody", and is far from ideal.

       This may be set in ups.conf with "user" in the global section.

       -D
           Raise the driver debug level. Use this multiple times for additional details.

COMMANDS

       upsdrvsvcctl supports three of the commands processed by upsdrvctl — start, stop and
       shutdown. They take an optional argument which is a UPS name from ups.conf(5). Without
       that argument, they operate on every UPS that is currently configured.

       Note: shutdown is currently supported by stopping the driver service instances to release
       the potentially held ports etc., calling the upsdrvctl directly for issuing the shutdown
       command, and restarting the driver service instances to reconnect when the device comes
       back online.

       start
           Start the UPS driver(s). In case of failure, further attempts may be executed by using
           the maxretry and retrydelay options - see ups.conf(5).

       stop
           Stop the UPS driver(s).

       upsdrvsvcctl also supports further operations for troubleshooting the mapping of NUT
       driver section names to the service instance names (which may differ due to limitations of
       various systems).

       list
           list the currently active mapping of service instances to device sections

       resync
           update the mapping of service instances for NUT drivers to device section names used
           in ups.conf (register new instances, tear down obsoleted ones).

COMMANDS OF UPSDRVCTL NOT (CURRENTLY) APPLICABLE TO UPSDRVSVCCTL

       shutdown
           Command the UPS driver(s) to run their shutdown sequence. Drivers are stopped
           according to their sdorder value - see ups.conf(5).

           Warning
           this will probably power off your computers, so don’t play around with this option.
           Only use it when your systems are prepared to lose power.

           Note
           refer to ups.conf(5) for using the nowait parameter.

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, upsdrvsvcctl (or rather
       nut-driver-enumerator.sh) would use a built-in default, which is often /usr/local/ups/etc.

DIAGNOSTICS

       upsdrvsvcctl will return a nonzero exit code if it encounters an error while performing
       the desired operation. This will also happen if a driver takes longer than the
       maxstartdelay period to enter the background.

       Any messages issued by the upsdrvctl program used to start the NUT drivers as part of the
       service instances' implementations, or by the drivers themselves, will be logged by the
       service management framework facilities and will not appear in your interactive terminal
       used to manage the driver.

       Use upsdrvsvcctl list or upsdrvsvcctl list NUT-device to find out the service instance
       name for the NUT driver (section name) you are interested in. Then look up the service
       logs (where the outputs of the service implementation program as well as the framework
       messages about this service are stored), as suggested below:

       Linux systemd
           Messages will normally be kept in the service journal, so:

               journalctl -lu nut-driver@instance-name

       Note that your local system configuration may be impacted by such nuances as passing the
       journal data to a standard syslog server, and/or by having a small cache for locally
       stored journal messages (so older entries would disappear). There may also be or not be a
       copy of the journals stored in the filesystem.

       Solaris SMF
           Look for /var/svc/log/system-power-nut-driver:instance-name.log file.

AUTHOR

       Jim Klimov <jimklimov+nut@gmail.com>