Server Rebooted for no apparent reason

[Tom H]

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.