I fixed my problem. Here's the answer, for those who might come later. So it wasn't rrdtool, and it also wasn't apache or cacti. The problem was in php.ini - PHP corrupted the data produced by rrdtool.
; Magic quotes for runtime-generated data, e.g. data from SQL, from exec(), etc. magic_quotes_runtime = Off And that's all it was. C. Falconer wrote, On 11/22/2010 03:50 PM: > I've had a problem for the past couple of months and its not obvious > what's at fault. I'm reasonably sure its not rrdtool though. > > ----------- > Problem: Cacti shows no graphs. > > If I get the rrdtool command line out of cacti's "graph debug" section, > and run that at the command line then I get the file at > http://criggie.org.nz/crap/cacti-good.png > > RRDTool Command: > /usr/bin/rrdtool graph - --imgformat=PNG --start=-86400 --end=-300 > --title='testhing for CF 3T - Ping Latency' --base=1000 --height=120 > --width=800 --alt-autoscale-max --lower-limit=0 > --vertical-label='milliseconds' --slope-mode --font TITLE:9: --font > AXIS:8: --font LEGEND:8: --font UNIT:8: > DEF:a="/var/www/html/cacti/rra/testhing_for_cf_3t_ping_1053.rrd":ping:AVERAGE > AREA:a#FFF200FF:"" > GPRINT:a:LAST:"Current\:%8.2lf %s" GPRINT:a:AVERAGE:"Average\:%8.2lf %s" > GPRINT:a:MAX:"Maximum\:%8.2lf %s" > > RRDTool Says: > > OK > > > So this works fine when pasted to a command line, and produces a valid > PNG file. > > ------------------------------------- > When I do a wget on the file > > wget -c > "http://192.168.100.198/cacti/graph_image.php?local_graph_id=821&rra_id=0&view_type=tree&graph_start=1290388765&graph_end=1290390565"; > -O cacti-bad.png > > I get the file at > http://criggie.org.nz/crap/cacti-bad.png > Which is an invalid PNG file > > > ----------------------------------- > Now, the two output PNGs differ > > cacti-bad.png > PNG image data, 1212437084 x 811347971, 135-bit > > cacti-good.png > PNG image data, 903 x 202, 8-bit/color RGBA, non-interlaced > > > $ ls -la *png > -rw-r--r-- 1 cf Domain Users 22180 Nov 19 13:34 cacti-bad.png > -rw-r--r-- 1 cf Domain Users 22860 Nov 19 13:35 cacti-good.png > > > > I've put an od -a at > http://rrdtool.pastebin.ca/1998463 > to show the differences. > > > > Now if I replace "\0" with nul in that file, its better but still not > right. > > $ cat cacti-bad.png | sed "s/\\\0/\x00/g" > cacti-sed.png > $ file cacti-sed.png > PNG image data, 903 x 230, 8-bit/color RGBA, non-interlaced > > > Therefore something is futzing with the data after it is generated by > rrdtool. > > ------------------------------------ > Other diagnostics: > > I have duplicated the entire cacti install to another host which is > similarly configured. It works perfectly and shows the graphs fine. > > ------------------------------------ > Details: > > Linux, Centos 5.5 running on an IBM x3250 in 32 bit mode > > # uname -srmopi > Linux 2.6.18-194.8.1.el5.centos.plusPAE i686 i686 i386 GNU/Linux > > # rpm -q rrdtool cacti php-gd httpd php > rrdtool-1.2.23-1.el5.rf > cacti-0.8.7f-1.3t > php-gd-5.1.6-27.el5 > httpd-2.2.3-43.el5.centos.3 > php-5.1.6-27.el5 > > > > > ------------------------------------- > Firstly I do not think rrdtool is the cause. I suspect its something to > do with the way apache's httpd is getting the data back > > > I have access to other servers configured basically the same way, and > they're all working fine. > > Cacti is continuing to poll correctly in the background. > > The problem seems to be rrdtool's output being fiddled before it hits > the end-user's browser. -- Craig Falconer The Total Team - Secure Networks for Serious Business Office: 0800 888 326 / +643 974 9128 Email: [email protected] Web: http://www.totalteam.co.nz/ _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
