Section: Maintenance Commands (8)Updated: January 2005Local indexUp
wd_keepalive - a simplified software watchdog daemon
This is a simplified version of the watchdog daemon. It only opens
and keeps writing to it often enough to keep the kernel from resetting,
at least once per minute. Each write delays the reboot
time another minute. After a minute of inactivity the watchdog hardware will
cause a reset. In the case of the software watchdog the ability to
reboot will depend on the state of the machines and interrupts.
The wd_keepalive daemon can be stopped without causing a reboot if the device
is closed correctly, unless your kernel is compiled with the
Under high system load
might be swapped out of memory and may fail
to make it back in in time. Under these circumstances the Linux kernel will
reset the machine. To make sure you won't get unnecessary reboots make
sure you have the variable
in the configuration file
This adds real time support to
it will lock itself into memory and there should be no problem even under the
highest of loads.
On system running out of memory the kernel will try to free enough memory by killing process. The
daemon itself is exempted from this so-called out-of-memory killer.
Available command line options are the following:
as the configuration file instead of the default