[mrtg] Re: "ERROR: Let's not do the time warp, again"

Alex van den Bogaerdt alex at ergens.op.HET.NET
Thu Aug 15 02:09:17 MEST 2002

Jonathan Nichols wrote:
> Greetings all -
>     Power failure today affected the box running MRTG. I rebooted it and
> started up MRTG a little while later.. and now I get the following error:
> ERROR: Let's not do the time warp, again. Logfile unchanged.
> Rateup ERROR: /usr/local/mrtg-2/bin/rateup found that's log
> file time of 1029353705 was greater than now
> (1029338254)

Time warp: The current time is before the last update time.

The log file was updated at Thu Aug 15 02:35:05 2002 your time.
The current time on your box is before that time.

> I've left it alone for about 2 hours now, and the "greater than now" value
> is increasing. The "log file time.." remains at 1029353705. Can I just

Sure it is increasing.  Time flies when you're debugging^Whaving fun.

> ignore it and hope that MRTG will catch up with itself or do I need to
> remove the log files and let it start recreating them from scratch again?

Eventually the time on the box be later than the last update time.
However, I think the time isn't set properly.

Query the time in UTC mode.  Compare with a known-good time source
such as http://sunearth.gsfc.nasa.gov/eclipse/SEhelp/TimeZone.html

Current time on my system matches the time from above link.

                [alex at home alex]$ date;date -u; date +%s
wall clock:     Thu Aug 15 01:57:54 CEST 2002
UTC time:       Wed Aug 14 23:57:54 UTC 2002
epoch time:     1029369474

Your system thinks it is 1029338254 (most likely a bit later
right now).  Hmmm... 6 hours slow.  You probably see no difference
when you do "date;date -u" --> Time zone problem and computer time
set to wall clock time.

On time zones:  make sure you use the right sign.
There's a system where you say "local time is UTC + 2 hours" and
there's a system where you say "local time is -2 hours west of UTC".
They mean the same thing!

> Is there any way to prevent this from happening in the future?

Make sure the power is OK --> use UPS
Make sure the time is correct --> use NTP.
Make sure the time zone is correct --> OS setting

 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
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