[mrtg] FW: TimeZones

Steve Shipway s.shipway at auckland.ac.nz
Wed Oct 7 22:58:42 CEST 2009

If you have no RRDTool , then you are running in Native mode (the graphs are re-created ever time MRTG polls) and therefore have no frontend.  You only need a frontend if you are running in RRD Mode, as then the graphs are only re-created on demand.

MRTG will inherit the timezone configuration from the Operating System, unless you override it.  If you override it, you need to give the new timezone name in a recognised format.

The timezone name can include specification of summer time; if so, then this will automatically be handled by the system time routines (IE you get all this for free!)

To find out how to specify the timezone correctly, in Fedora/RHEL use the command 'tzselect'.  This runs you through a bunch of menus and finally outputs the value you should use to specify the timezone you selected.  In your case, for Netherlands, on a RedHat Fedora system, it should be:

Timezone[targetname]: Europe/Amsterdam

and this will be converted by the OS routines to the correct timezone rules.  The timezone name is case sensitive and punctuation/space sensitive and should be given EXACTLY as specified else it wont work (in your example, you replaced the / with a comma and so it failed and defaulted to GMT)

Other operating systems will need to specify things differently; for example, under AIX Auckland's timezone is specified as "NZST-12NZDT,M9.5.0,M4.1.0"


From: mrtg-bounces at lists.oetiker.ch [mailto:mrtg-bounces at lists.oetiker.ch] On Behalf Of Nick Price
Sent: Wednesday, 7 October 2009 9:18 p.m.
To: mrtg at lists.oetiker.ch
Subject: Re: [mrtg] FW: TimeZones

1.   I installed MRTG as per the documentation from MRTG  it didn't ask for RRDTool

2.   I selected my location during the install of fedora I haven't done anything else since then

3.   Timezone[myIPaddress_1]:Amsterdam, Europe   ... and the other  Timezone[myIPaddress_1]London, Europe   have also tried GMT+1/ GMT+2  doesn't matter it only gives GMT  on both (for Amsterdam 2 hrs out)

4.   How do I tell if I am using a front end    I view the graphs from a web browser on other PC's  usually windows

5.   If I don't use "timezone" the graphs are set to the local time of the server  if I do use "timezone" the graphs are set to GMT regardless of what I try to tell it

Also is there a way once this works of MRTG automatically changing from summer to winter time. Date does differ from country to country


Can we have some more information?

 1.  Are you running MRTG natively or with RRDTool, and if with RRDTool, which frontend?
 2.  How have you defined the timezone in the server OS?
 3.  How have you defined the timezone in the MRTG cfg files?
 4.  If using a MRTG/RRD frontend, how have you defined the timezone in there?
 5.  How is it going wrong - is it just using the server timezone, or are individual graphs coming in the wrong timezone, or what?

I know this /can/ work with devices in different timezones and their graphs displaying relative to the device's timezone rather than the MRTG server's timezone.  Making it display relative to the browser's timezone is a bit harder.


From: mrtg-bounces at lists.oetiker.ch [mailto:mrtg-bounces at lists.oetiker.ch] On Behalf Of Nick Price
Sent: Wednesday, 7 October 2009 11:26 a.m.
To: mrtg at lists.oetiker.ch
Subject: [mrtg] FW: TimeZones

Hi All

I can't seem to get the timezone command to display the correct time

I'm running fedora 11 and mrtg 2.16.2

I am on CET  (central European time)  GMT +2

I monitor systems across 4 different time zones

If I don't use the timezone command it display my local time if I use the timezone command its 2 hrs behind my local time

I have tried using Amsterdam, Europe or GMT+2 it doesn't matter it is still the wrong time

Any ideas on how t get this to display the correct time

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