Re: Forcing an immediate reboot

From: Marc Perkel
Date: Sat Oct 15 2005 - 09:36:16 EST

Anton Altaparmakov wrote:

On Fri, 14 Oct 2005, Lee Revell wrote:

On Fri, 2005-10-14 at 18:46 -0700, Marc Perkel wrote:

Is there any way to force an immediate reboot as if to push the reset button in software? Got a remote server that i need to reboot and shutdown isn't working.

If it has Oopsed, and the "reboot" command does not work, then all bets
are off - kernel memory has probably been corrupted.

Get one of those powerstrips that you can telnet into and power cycle
things remotely.

If it has sysrq compiled in as root just do:

echo s > /proc/sysrq-trigger
echo u > /proc/sysre-trigger
echo s > /proc/sysrq-trigger
echo b > /proc/sysrq-trigger

This will "sync", "umount/remount read-only", "sync", "immediate hardware reboot". Should always work...

This worked great. If I had this last night it would probably have saved me a trip to San Jose. I especially like that it does the file system syncs. I've put it in a script I call "coldboot" and it is now one of my tools.

Very useful.

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