On Thu, 2013-09-19 at 07:56 +0100, Mike Moreton wrote:
> On Fri, 2013-09-13 at 20:46 +0000, Andy Cress wrote:
> > Folks,
> >
> > Currently net-snmp measures sysUpTime relative to when the snmpd
> > starts, and perhaps that is often the same as the overall system
> > uptime, but in some systems, the services could be restarted without
> > rebooting, so I am proposing that the sysUpTime should be measured
> > against the /proc/uptime or /usr/bin/uptime value instead. The daemon
> > could read this at init time.
>
> I recently came across this problem on an embedded system where I was
> restarting the daemon in the (extremely rare) event that I needed to
> change an account password. Suddenly my "reboot" detection triggered
> because sysUptime had gone backwards.
>
> I could see various solutions to this problem:
>
> 1) Use the MIB based authentication configuration, but this wasn't an option
> for me as we didn't want that enabled in the system.
> 2) Find some other way of re-configuring snmpd without restarting. Well
> I failed on that one.
> 3) Find some other, more appropriate object to use for reboot detection.
> Again I failed.
hrSystemUptime?
DESCRIPTION
"The amount of time since this host was last
initialized. Note that this is different from
sysUpTime in the SNMPv2-MIB [RFC1907] because
sysUpTime is the uptime of the network management
portion of the system."
> 4) Patch snmpd to use the system uptime.
>
> I ended up doing the latter, even though I don't believe it's strictly correct
> (see patch below). I wonder if this could be put in inside #ifdefs for we
> strange people who prefer the non-correct operation?
>
given the existance of hrSystemUptime I think it would be a bad idea.
By the way, what will happen when your device have been up for 497 days?
(TimeTicks overflows at that time)
I have to admit I am somewhat surprised to not find any systemBootTime
that tells, as a DateAndTime string, when the system was last booted.
/MF
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