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SENSORSD(8) System Manager's Manual SENSORSD(8)

sensorsdhardware sensors monitor

sensorsd [-d] [-c check] [-f file]

The sensorsd utility retrieves sensor monitoring data like fan speed, temperature, voltage and RAID logical disk status from the sysctl(2) hw.sensors subtree. When the state of any monitored sensor changes, an alert is triggered. Every alert logs a message to syslog(3) using the daemon facility. Optionally, an alert can be configured to execute a command.

By default, sensorsd monitors status changes on all sensors that keep their state, thus sensors that automatically provide status do not require any additional configuration. In addition, for every sensor, no matter whether it automatically provides its state or not, custom low and high limits may be set, so that a local notion of sensor status can be computed by sensorsd, indicating whether the sensor is within or is exceeding its limits.

Limit and command values for a particular sensor may be specified in the sensorsd.conf(5) configuration file. This file is reloaded upon receiving SIGHUP.

The options are as follows:

Check sensors every check seconds. The default is 20. The state of a sensor is not yet regarded as changed when a check returns a new state for the first time, but only when the two subsequent checks both confirm the new state.
Do not daemonize. If this option is specified, sensorsd will run in the foreground.
Read configuration from file instead of the default configuration file /etc/sensorsd.conf.

Configuration file for sensorsd.

sysctl(2), sensorsd.conf(5), syslog.conf(5), sysctl(8)

The sensorsd program first appeared in OpenBSD 3.5.

Certain sensors may erratically flip status from time to time. To guard against false reports, sensorsd requires two confirmations before reporting a state change. However, this inevitably introduces an additional delay in status reporting and command execution, e.g. one may notice that sensorsd makes its initial report about the state of monitored sensors not immediately, but by default about 60 seconds after it is started.

January 12, 2018 OpenBSD-6.7