Nagios help : to display when was my server lastrebooted.

[Paul Weaver]

Uptime is a funny thing, it can go to zero for a number of reasons,
usually because a 32 bit counter has rolled over (after 136 years, 68
years, 500 days, 250 days, 49.7 days (win98 just stalled at this point),
or 25 days.

You can sometimes monitor the SNMP OID "htSystemUptime", which appears
on my linux, solaris and windows 2000 boxes. When this value decreases
to nearly 0, you've had a reboot, or the counter has rotated.

This value is probably the same value reported by "uptime" on a linux or
windows box. If you want to know when your system is available, you
could set a "check_ping" *service* on thie host, in nagios, running
every 30 seconds with retrys every 5 seconds. If the service goes away,
then there's a good chance it's rebooted itself.

If you suspect a reboot, look through the logs. In linux, run "last",
you should see a "reboot" user if the system has rebooted. In windows
check the Security or Applications logs from the suspected reboot time.

Perhaps you had a power failure which caused your box to reboot?

--
"Power corrupts. Power failure corrupts absolutely"
-----Original Message-----
From: nagios-users-bounces at lists.sourceforge.net
[mailto:nagios-users-bounces at lists.sourceforge.net] On Behalf Of
Pallav.S.Gupta at relianceada.com
Sent: 10 April 2008 12:19
To: nagios-users at lists.sourceforge.net
Subject: [Nagios-users] Nagios help : to display when was my server
lastrebooted.
Importance: High



Hi All

I want my nagios to display when was my windows/unix based system was
last rebooted , Is it possible to do so......since my Uptime is showing
that System Uptime 1day 1 hr but i haven't rebooted it . 






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