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.