[rrd-users] Re: rrd-users PROBLEM
oetiker at ee.ethz.ch
Tue Aug 10 16:51:33 MEST 1999
Today you sent me mail regarding [rrd-users] rrd-users PROBLEM:
*> > > *> With the help of rrdgraph command I can get .gif/.png file . Instead of
*> > > *> this I want as my database is being updated, my graph on the screen
*> > > *> should be updated according to the changes in database by the time. I
*> > > *> don't want to create gif/png file . Actually I want this for real time
*> > > *> plotting. How I can do this thing.
*> > >
*> > > not sure what you expect to see ... a movie ? for updating you must uyse
*> > > rrdtool update
*> > >
*> > > cheers
*> > > tobi
*> > duh,...
*> > lemme guess
*> > you are talking about making the web page reload the graph
*> > thats not a rrdtool problem at all. You'd be wanting to play with .meta files
*> > and expiries. the mail tool I'll (eventually) submit uses that technique but
*> > be aware, its something your web server would have to supportand your browser to
*> > understand,
*> > Tobi, I think he's refering to the 5 minute update feature you had with mrtg
*> > Phil
*> > =--=
*> I should have appended this
*> <META HTTP-EQUIV="Refresh" CONTENT="300" >
*> <META HTTP-EQUIV="Pragma" CONTENT="no-cache" >
*> <META HTTP-EQUIV="Expires" CONTENT="Tue Aug 10 10:15:10 BST 1999">
*> Basically it says 'Update this page every 5 minutes'
*> 'Do not cache this page cos that would be daft'
*> 'Assuming you keep a decent NTP clock, this page
*> will self destruct at...'
*> The only fun to be had is the dynamic rebuilding of the 'Expires' line
if you use rrd_cgi these things will be added automatically in the HTTP
header portion of the page ...
*> If you use shell, you can get it by using something like
*> FUTURE=`$GNUDATE --date="+5 minutes"`
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