35 lines
1.2 KiB
Plaintext
35 lines
1.2 KiB
Plaintext
This is the watchdog package for Fedora. It implements a userspace
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daemon which periodically pings (usually hardware) to tell the
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hardware that the machine is alive. If the hardware times out without
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receiving a ping, it assumes userspace is dead and reboots the
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machine.
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There are several major classes of watchdog available:
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- watchdog hardware implementing the Linux /dev/watchdog API
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* drivers in /lib/modules/$(uname -r)/kernel/drivers/watchdog/
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* http://lxr.linux.no/linux/Documentation/watchdog/watchdog-api.txt
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- softdog
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* software watchdog (just runs inside the kernel)
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* implements the Linux /dev/watchdog API
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* won't help you if the kernel fails (obvious, right?)
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- IPMI
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* a heavyweight standard for all things server-management
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* separate Linux driver
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* ipmitool to control it
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* see README.watchdog.ipmi for how to use this daemon together
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with IPMI
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You can also use watchdogs inside recent QEMU/KVM virtual machines.
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When running qemu, specify "-watchdog i6300esb" on the qemu command
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line (or use libvirt). Inside the guest, the i6300esb watchdog driver
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should automatically load and provide you with a Linux /dev/watchdog-
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compatible API.
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- Richard W.M. Jones (rjones@redhat.com) 2009-02-26
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