Server Rebooted for no apparent reason

[NoOp]

On 05/03/2010 12:53 PM, Tom H wrote:
> On Mon, May 3, 2010 at 2:31 PM, Maxime Alarie <malarie at processia.com> wrote:
>>
>> My ubuntu server rebooted this morning, without any explication.  I have
>> checked the log files dmesg and syslog, and kern.log but found nothing.
>> Updates are manual on this server (except security updates)
>>
>> Is there a better place to check than syslog, dmesg? Boot.log is empty:
>>
>> root at olympe:/var/log# cat boot
>>
>> (Nothing has been logged yet.)
> 
> Have you set bootlogd to run in
> /etc/default/bootlogd
> 
> Anyway, boot.log will not give you the reason for the reboot - and it
> is not particularly verbose (by design because of upstart IIRC)
> anyway.
> 
> Although between dmesg, kern.log, and syslog, you must have all the
> info that you need, check messages too and look at whatever is logged
> just before the reboot in these four files.
> 

Might also be worth checking:

$ history
or if the history is too long:
$ history | more

Little late now that it's already rebooted, but it might be another good
idea to check the bios log to see if it was a temp shutdown/reboot.