Software and/or Hardware watchdog daemon
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 sysconfig 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.
Watchdog is a daemon that checks if your system is still working. If
programs in user space are not longer executed it will reboot the system.
However, this will not always work.
From the kernel:
> Watchdog Timer Interfaces For The Linux Operating System
> Alan Cox <email@example.com>
> Custom Linux Driver And Program Development
>All four interfaces provide /dev/watch
Instructions for how to set up the watchdog daemon to work with IPMI's hardware watchdog
First, verify that the ipmitool utility is present on the system to allow
the watchdog timer to be turned off via the command line (which ipmitool).
This will allow the hardware watchdog timer to be turned off gracefully
I'd like to provide better scripts with watchdog. So if you use your own
script/binary to test the state of your system resp. to act as repair
script, please mail me a copy so I can include it here.
See ChangeLog for infos about the latest changes.
watchdog - a sof
wd_keepalive - a
Fri Feb 23 13:26:14 MET 1996
- Watchdog 1.0 released.
Tue Mar 5 09:11:34 MET 1996
- Fixed two
Browse inside watchdog-5.6-1.el5.x86_64.rpm
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