watchdog A daemon that checks if your system is still working.
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monitoring system system monitoring watchdog check system kernel watcher

watchdog Description

A daemon that checks if your system is still working. Watchdog application 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.The Linux kernel can reset the system if serious problems are detected. This can be implemented via special watchdog hardware, or via a slightly less reliable software-only watchdog inside the kernel.Either way, there needs to be a daemon that tells the kernel the system is working fine. If the daemon stops doing that, the system is reset. watchdog is such a daemon. It opens /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 the watchdog hardware will cause the reset. In the case of a software watchdog, the ability to reboot will depend on the state of the machines and interrupts. What's New in This Release: · Added patch by Enrique Zanardi to check for the source of the ping reply packets. · Added patch by Lon Hohberger to allow configuration of timeouts. · Added another patch by Lon Hohberger to make sure signal handler does not call not-signal safe functions. · Made wd_keepalive accept all options watchdog accepts and not throw errors on those it does not use itself. · Made watchdog not close the watchdog device so early when trying a normal shutdown. This ensures a reset even if the system hangs while doing this. · Applied patch by Richard W.M. Jones to cleanup code base for gcc-4.4. · More bugfixes

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