[rrd-users] Re: HRULEs at every midnight

Alex van den Bogaerdt alex at ergens.op.het.net
Thu Jan 16 15:26:35 MET 2003

On Thu, Jan 16, 2003 at 01:23:16PM +0100, Daniel VASARHELYI wrote:
> Hi!
> Is there a way to draw a HRULE at every midnight?

You mean VRULE.  Assuming you wrote VRULE:

Yes, there is.

You are programming a front-end.  It is your job to
let RRDtool know what to do.

RRDtool can draw a VRULE at any time you like.  The
approach to your goal is:

1: know what the start and end of your graph will be
2: know what the offset between local time and UTC is
3: compute the time for midnight on or before the start
   of your graph
4: compute the time for midnight on or after the end
   of your graph
5: create a VRULE statement for each of the times where
   time is between start and end *and* where time is
   first_midnight + n*86400
   (this is done inside a for-next loop, for instance)

Much of what looks like rudeness in hacker circles is not intended to give
offence. Rather, it's the product of the direct, cut-through-the-bullshit
communications style that is natural to people who are more concerned about
solving problems than making others feel warm and fuzzy.


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