[rrd-users] Re: HRULEs at every midnight

[Alex van den Bogaerdt]

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)

HTH
Alex
-- 
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.

http://www.tuxedo.org/~esr/faqs/smart-questions.html

--
Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:rrd-users-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/rrd-users
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi