I could run correctly mrtg by typing the command, but from the cron table it was
not working correctly.
the problem was that, when called by the cron, "snmpget" was not foung in the
env path, and so on no result were given back to mrtg, which just display
nothing...

apparently the "env" i used when logged, and the "env" used by cron is not the
same...

problen resolved by giving the whole path of snmpget in the perl script.

Im sure an unix guru would have solved that by giving good path when running as
a cron, but...

Thanks for your help,

Nicolas







(Embedded image moved to file: pic18954.pcx)

From:     Viana Gomes@BNP on 12/05/2000 12:48


To:  Nicolas PIGEAU

cc:

bcc:

Subject:  Re: [mrtg] problem using result from external script  (Document link
      not converted)


 Hi Nicolas.
 Have tried to run the script outside mrtg ?

You can try to "chomp" the variables...like this:
....
$getsnmp_1 =~ /^interfaces.ifTable.ifEntry.ifInErrors.\d+\s\D\sCounter:\s(\d+)/;
chomp $getsnmp_1;


I'had to use this trick with several of my scripts.

Best regards.
Viana Gomes
BNP Portugal





nicolas.pigeau@paribas.com on 12-05-2000 09:34:41

To:   mrtg@list.ee.ethz.ch
cc:    (bcc: Viana Gomes/DOI_SYSTEMS/LISBOA/BFI/BNP)
Subject:  [mrtg] problem using result from external script








Hi All,

Here is my (new) problem: using an external script to get "input errors" on two
interfaces and display them on the same graph.

I attached the script I created at the end of this mail.
I tested it, and it seems to me that the result are OK (I compared the result
with an snmpget, and quite surprisingly, the result is the same...)
But when I use it with MRTG, I get an:
 ""  Problem with Externale get '`/opt/mrtg-2.8.9/run/my_contrib/get_errors.pl
20.20.20.1 public 2 20.20.20.2 public 4`':
    Expected an INTEGER for 'out' but got ''  ""      (same problem with "in").

I compared my script with scripts found in the "contrib" folder, and I didn't
find any special trick to return the result...
And it looks like MRTG try to convert the result in an integer, but after that:
     1: the graph are empty or show "wrong" data.
     2: when checking the .log files, the data look wrong, as the first line
should be the last polled data, and it's not...

Any help, or anyone who had same kind of problem.....

Thanks,

Nicolas

ps: By the way, I found out using MRTG that "MaxBytes[]" is quite a dangerous
parameter: set too small, you don't get anything on the graph,
or worst, you think it's ok, but in fact all the graphs are "truncated"....



#!/usr/bin/perl
#get_errors.pl
if ( scalar(@ARGV) > 6 || scalar(@ARGV) == 0 )
   {
   print("USAGE: get_errors.pl IP_router_1 Community_name_1 mib_instance
IP_router_2 Community_name_2 mib_instance\n");
   exit(-1);
   }
$IP_1 = $ARGV[0];
$Com_nam_1 = $ARGV[1];
$mib_1 = $ARGV[2];
$IP_2 = $ARGV[3];
$Com_nam_2 = $ARGV[4];
$mib_2 = $ARGV[5];
$getsnmp_1 = `snmpget -c $Com_nam_1 -r 3 $IP_1 1.3.6.1.2.1.2.2.1.14.$mib_1`;
$getsnmp_1 =~ /^interfaces.ifTable.ifEntry.ifInErrors.\d+\s\D\sCounter:\s(\d+)/;
print $1."\n";
$getsnmp_2 = `snmpget -c $Com_nam_2 -r 3 $IP_2 1.3.6.1.2.1.2.2.1.14.$mib_2`;
$getsnmp_2 =~ /^interfaces.ifTable.ifEntry.ifInErrors.\d+\s\D\sCounter:\s(\d+)/;
print $1."\n";
print "--\n";
print $IP_1." instance ".$mib_1.", and ".$IP_2." instance ".$mib_2."
(ifInErrors).\n";
exit(0);
#EOF






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