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watchdog - system health checker and software/hardware watchdog handler…  more info»

wd_keepalive.8.gz

WD_KEEPALIVE(8)                                      WD_KEEPALIVE(8)



NAME
       wd_keepalive - a simplified software watchdog daemon

SYNOPSIS
       wd_keepalive [-c filename|--config-file filename]

DESCRIPTION
       This  is a simplified version of the watchdog daemon. If con‐
       figured so it only opens
        .IR /dev/watchdog , 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 inter‐
       rupts.

       The wd_keepalive daemon can  be  stopped  without  causing  a
       reboot  if  the  device  /dev/watchdog  is  closed correctly,
       unless  your  kernel  is  compiled  with  the   CONFIG_WATCH‐
       DOG_NOWAYOUT option enabled.

       Under  high  system load wd_keepalive 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  realtime set to yes in the configuration
       file  watchdog.conf.   This  adds  real   time   support   to
       wd_keepalive:  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 wd_keepalive daemon
       itself is exempted from this so-called out-of-memory killer.

OPTIONS
       Available command line options are the following:

       -c config-file, --config-file config-file
              Use config-file as the configuration file  instead  of
              the default /etc/watchdog.conf.

FILES
       /dev/watchdog
              The watchdog device.

       /var/run/wd_keepalive.pid
              The pid file of the running wd_keepalive.

SEE ALSO
       watchdog.conf(5)

       watchdog(8)



4th Berkeley Distribution   January 2005             WD_KEEPALIVE(8)
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