[rrd-users] Re: VRULE with dynamic time

Patrick Rother krd-rrd-users at roka.net
Wed Jun 6 15:30:52 MEST 2001

On Wed, Jun 06, 2001 at 02:32:56PM +0200, Alex van den Bogaerdt wrote:
> krd-rrd-users at roka.net wrote:
> > I would like to get an rrd graph over 60 hours, with a VRULE at one day ago.
> > 
> > I tried the following, but this doesn't seem to be supported.
> > ([ERROR: can't parse 't2#FF0000:'])
> > 
> > What can I do?
> > 
> > CDEF:t=NOW
> > CDEF:t2=t,86400,-
> > VRULE:t2#FF0000:
> This won't work.  You have to calculate "now" and "now-1d" in the
> front end.  The results can be given to RRDtool.
> CDEF:t=NOW   doesn't work (AFAIK)
> CDEF:t2=t,86400    won't work because of the previous error
> VRULE:t2#FF0000    won't work because t2 should be a number, not a var
> (this last thing is expected to change in the future).
> For now:  in your script calculate t and t2.  Then give "CDEF:${t2}#FF0000:"
> to RRDtool (where "${t2}" is parsed by your OS, not by RRDtool)

Thank you for this, it seems to work well.

t=`date -d "one day ago" +%s`


Thank you!


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