Re: Forcing an immediate reboot

[Marc Perkel <marc@perkel.com>]

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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