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watchdog - Software and/or Hardware watchdog daemon
- Description:
The watchdog program can be used as a powerful software watchdog
daemon or may be alternately used with a hardware watchdog device
such as the IPMI hardware watchdog driver interface to a resident
Baseboard Management Controller (BMC). watchdog periodically writes
to /dev/watchdog; the interval between writes to /dev/watchdog is
configurable through settings in the watchdog config file. This
configuration file is also used to set the watchdog to be used as a
hardware watchdog instead of its default software watchdog operation.
In either case, if the device is open but not written to within the
configured time period, the watchdog timer expiration will trigger a
machine reboot. When operating as a software watchdog, the ability to
reboot will depend on the state of the machine and interrupts. When
operating as a hardware watchdog, the machine will experience a hard
reset (or whatever action was configured to be taken upon watchdog
timer expiration) initiated by the BMC.
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