Ghost Reboot

I'm a system administrator ,i manage a Red Hat linux based server .I often
watch uptime of my machine ,and one day i saw that uptime was reset .

I'm sure that server did not reboot because in LILO default kernel is
another Kernel than it's now running .

I'm not sure what could happen with this .

Any ideas ?

Jander <migcpn@terra.es_NOSPAM> wrote:
> I'm a system administrator ,i manage a Red Hat linux based server .I often
> watch uptime of my machine ,and one day i saw that uptime was reset .
>

if you don't know how to check when or why your machine was rebooted, you
shouldn't call yourself a sysadmin.

> I'm sure that server did not reboot because in LILO default kernel is
> another Kernel than it's now running .

that doesn't say anything. someone could have changed it and changed it
back after reboot.

if the server had an uptime over 400 days you might have had an 'uptime
overflow'. there was a quite interesting thread about this topic here a
few weeks ago.


man last
man syslog
vim /var/log/*.log

hth, armin

--

life, the universe and everything
http://www.dtch.org

On Tue, 29 Jul 2003 18:31:00 +0200, Jander wrote:

> I'm a system administrator ,i manage a Red Hat linux based server .I
> often watch uptime of my machine ,and one day i saw that uptime was
> reset .
>
> I'm sure that server did not reboot because in LILO default kernel is
> another Kernel than it's now running .
>
> I'm not sure what could happen with this .
>
> Any ideas ?

Could be any of the following;

uptime rollover

thermal reset

AC power problem

hacking

And many others, you need to check the logs and the system. And find out
for sure.