Sorry about formatting!
Strong cup of coffee required before proceeding
I have rrd setup as a service on a remote box using xinetd.
I have been able to echo command to this piping thru netcat, and been able
to do creates, updates, info, last, etc.
My end goal is to use rrdgraph against a remote rrdrsv, and show the
resulting graph in web interface thru PHP code.
I think I've uncovered a related bug whereby one cannot use spaces between
double quotes.
Examples as follow;
This works;
[root@nagios httpd]# echo `cat /tmp/rrdgraph` | nc 192.168.122.32 13900
[root@nagios httpd]# cat /tmp/rrdgraph graph sjw.png
DEF:var1=localhost/_HOST_.rrd:1:AVERAGE "CDEF:sp1=var1,100,/,12,*"
"CDEF:sp2=var1,100,/,30,*" "CDEF:sp3=var1,100,/,50,*"
"CDEF:sp4=var1,100,/,70,*" AREA:var1#FF5C00:"Round Trip Times "
AREA:sp4#FF7C00: AREA:sp3#FF9C00: AREA:sp2#FFBC00: AREA:sp1#FFDC00:
GPRINT:var1:LAST:"%6.2lf ms last " GPRINT:var1:MAX:"%6.2lf ms max "
GPRINT:var1:AVERAGE:"%6.2lf ms avg \n" LINE1:var1#000000:""
This does not work directly from command line, although it's exactly the
same code from /tmp/rrdgraph;
[root@nagios httpd]# echo "graph sjw.png
DEF:var1=localhost/_HOST_.rrd:1:AVERAGE "CDEF:sp1=var1,100,/,12,*"
"CDEF:sp2=var1,100,/,30,*" "CDEF:sp3=var1,100,/,50,*"
"CDEF:sp4=var1,100,/,70,*" AREA:var1#FF5C00:"Round Trip Times "
AREA:sp4#FF7C00: AREA:sp3#FF9C00: AREA:sp2#FFBC00: AREA:sp1#FFDC00:
GPRINT:var1:LAST:"%6.2lf ms last " GPRINT:var1:MAX:"%6.2lf ms max "
GPRINT:var1:AVERAGE:"%6.2lf ms avg \n" LINE1:var1#000000:""" | nc
192.168.122.32 13900
***snip****
ERROR: 'T' is not a valid function name
I've made the T in the command BOLD above to make it stand out. It's the
first letter of "Trip"
Now, when I remove the spaces from between the double quotes, it works;
[root@nagios httpd]# echo "graph sjw.png
DEF:var1=localhost/_HOST_.rrd:1:AVERAGE "CDEF:sp1=var1,100,/,12,*"
"CDEF:sp2=var1,100,/,30,*" "CDEF:sp3=var1,100,/,50,*"
"CDEF:sp4=var1,100,/,70,*" AREA:var1#FF5C00:"Round_Trip_Times "
AREA:sp4#FF7C00: AREA:sp3#FF9C00: AREA:sp2#FFBC00: AREA:sp1#FFDC00:
GPRINT:var1:LAST:"%6.2lf " GPRINT:var1:MAX:"%6.2lf "
GPRINT:var1:AVERAGE:"%6.2lf" LINE1:var1#000000:""" | nc 192.168.122.32 13900
....so, maybe I've found a bug here???
So, when I use the command line above, sjw.png gets created on the remote
server. If I change the sjw.png for a -, I see PNG style splat on the screen
as I would hope for. Now to sew this into a PHP script;
********
<? P H P
//set the document header so that this renders as an image
header("Content-type: image/png");
//this is the shell command that you want to execute
// $cmdString = 'echo `cat /tmp/rrdgraph` | /usr/bin/nc 192.168.122.32
13900';
//$cmdString = '`cat /tmp/rrdgraph` | /usr/bin/nc 192.168.122.32 13900';
<******** If I store the rrd "graph" commands in a file, I get a 0 back, but
no PNG is created, nor any errors.
$cmdString = ' echo "graph - DEF:var1=localhost/_HOST_.rrd:1:AVERAGE
"CDEF:sp1=var1,100,/,12,*" "CDEF:sp2=var1,100,/,30,*"
"CDEF:sp3=var1,100,/,50,*" "CDEF:sp4=var1,100,/,70,*"
AREA:var1#FF5C00:"Round_Trip_Times " AREA:sp4#FF7C00: AREA:sp3#FF9C00:
AREA:sp2#FFBC00: AREA:sp1#FFDC00: GPRINT:var1:LAST:"%6.2lf "
GPRINT:var1:MAX:"%6.2lf " GPRINT:var1:AVERAGE:"%6.2lf" LINE1:var1#000000:"""
| nc 192.168.122.32 13900 '; <*******This one is closest to working I
think
// $cmdString = 'echo "graph - DEF:var1=localhost/_HOST_.rrd:1:AVERAGE
CDEF:sp1=var1,100,/,12,* CDEF:sp2=var1,100,/,30,* CDEF:sp3=var1,100,/,50,*
CDEF:sp4=var1,100,/,70,* AREA:var1#FF5C00:"Round Trip Times "
AREA:sp4#FF7C00: AREA:sp3#FF9C00: AREA:sp2#FFBC00: AREA:sp1#FFDC00:
GPRINT:var1:LAST:"%6.2lf ms last " GPRINT:var1:MAX:"%6.2lf ms max "
GPRINT:var1:AVERAGE:"%6.2lf ms avg \n" LINE1:var1#000000:"""|/usr/bin/nc
192.168.122.32 13900';
//if I can see a hard-coded test that works, I can add the support that
would be needed on our end
//execute command and direct output to browser
passthru($cmdString,$bool);
$debugstring = "CMD: $cmdString RETURNCODE: $bool \n";
//lets create a simple log for debugging, keep a running tail on this.
file_put_contents('/tmp/debugger.log',$debugstring,FILE_APPEND);
//file_put_contents('/tmp/debugger.log',$debugstring,'a'); <*****
changed the "a" to FILE_APPEND :)
?>
********
...when I check my PHP debug log, I see a zero, meaning everything is
"good"....but I see no graph displayed in my browser, nor any
/var/log/httpd/error_log message.
CMD: echo "graph - DEF:var1=localhost/_HOST_.rrd:1:AVERAGE
"CDEF:sp1=var1,100,/,12,*" "CDEF:sp2=var1,100,/,30,*"
"CDEF:sp3=var1,100,/,50,*" "CDEF:sp4=var1,100,/,70,*"
AREA:var1#FF5C00:"Round_Trip_Times " AREA:sp4#FF7C00: AREA:sp3#FF9C00:
AREA:sp2#FFBC00: AREA:sp1#FFDC00: GPRINT:var1:LAST:"%6.2lf "
GPRINT:var1:MAX:"%6.2lf " GPRINT:var1:AVERAGE:"%6.2lf" LINE1:var1#000000:"""
| nc 192.168.122.32 13900 RETURNCODE: 0
Perplexing. Anybody had any luck with getting around my "bug, and/or remote
PHP graph display????
Regs, Stephen
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