[rrd-users] Re: VRULE with dynamic time

[Alex van den Bogaerdt]

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)

HTH
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