mrtgsysinfo:
script that is executed on each system to report info
Linux version:
----------------------------------
#!/bin/sh
trap "/bin/echo Goodby;exit 0" 1 2 3 4 5 6 7 10 15
uptime
ps -ef|grep -v UID|wc -l
vmstat 1 2|grep -v procs|grep -v swpd
------------------------------------
Solaris version:
----------------------------------
#!/bin/sh
trap "/bin/echo Goodby;exit 0" 1 2 3 4 5 6 7 10 15
uptime
ps -ef|grep -v UID|wc -l
vmstat 1 2|grep -v procs|grep -v swap
mpstat 1 2| grep -v CPU
----------------------------------

Each system runs the script from inetd, so /etc/services &
/etc/inetd.conf need to be updated.
services:
# added by dmz for mrtg
stats           7260/tcp

inetd.conf:
# added by dmz 0330 for mrtg
stats   stream  tcp     nowait  nobody  /usr/local/bin/mrtgsysinfo      mrtgsysinfo

-------
Restart the inetd process and now you can telnet to port
7260 and get the info from the script.

Now comes the fun part.  MRTG was built do monitor
network load and is only setup to receive 2 values (in/out)
which we can use for our graph.  I'm sure it could be
modified to graph several values but I haven't dug into
it that much yet.

The mrtg format is:
value1
value2
uptime
hostname

Using this format a little perl program is used to logon
to a specified host and parse the stats info returning
various combinations.  I didn't convert the uptime so it
currently only returns 0 for uptime.  Note, this script
needs Net::Telnet.

mrtgnetload:
------------------------------------------
#!/usr/bin/perl
use Net::Telnet ();

sub usage() {
  print "Usage - mrtgnetload (host) (option) (linux|cpu#)\n";
  print "   (option) = load\n";
  print "              memory\n";
  print "              system_load\n";
  print "              user_load\n";
  print "              user_system_load\n";
  print "              idle_load\n";
  print "              cpu     (defaults to cpu1)\n";
  print "              cpuuser (defaults to cpu1)\n";
  print "              cpusys  (defaults to cpu1)\n";
  exit 0;
}

  $argc = @ARGV;
  if ( $argc < 2) {
    usage();
  }

  $linux = 0;
  $host = $ARGV[0];
  $option = $ARGV[1];
  $show_cpu = 0;
  if ( $ARGV[2] ) {
    if ( $ARGV[2] eq "linux") {
      $linux = 1;
    } else {
      $show_cpu = $ARGV[2];
      $show_cpu--;
    }
  }
  $port=7260;
 
  $t = new Net::Telnet ();
 
  $t->open(Host=>$host,Port=>$port,Timeout=>10);
  $count = 0;
  $cpu = 0;
  $line = $t->getline();
  while ( ! $t->eof ) {
    if ( $count == 0 ) {
      ( $junk, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $current_load, $junk, $junk) = split(" ", $line);
      $current_load =~ s/,//;

      $current_load = $current_load * 100;
    } elsif ( $count == 1) {
      ( $num_processes) = split(" ",$line);
    } elsif ( $count == 2 || $count == 3 ){
      if ( $linux ) {
        ( $junk, $junk, $junk, $junk, $free_swap, $free_mem, $memory_cache, $junk, $junk, $junk, $junk, $junk, $junk, $user_load, $system_load, $idle_load ) = split(" ", $line);
      } else {
        ( $junk, $junk, $junk, $free_swap, $free_mem, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $user_load, $system_load, $idle_load ) = split(" ", $line);
     }
    } else {
      ( $cpu_number[$cpu], $junk, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $junk, $cpu_user, $cpu_system, $cpu_wait, $cpu_idle) = split(" ", $line);
      $cpu_user[$cpu_number[$cpu]] = $cpu_user;
      $cpu_system[$cpu_number[$cpu]] = $cpu_system;
      $cpu_wait[$cpu_number[$cpu]] = $cpu_wait;
      $cpu_idle[$cpu_number[$cpu]] = $cpu_idle;
      $cpu++;
    }
    $count++;
    $line = $t->getline();
  }
  if ( $option eq "load" ) {
    print "$num_processes\n$current_load\n0\n$host\n";
  } elsif ( $option eq "memory" ) {
    print "$free_swap\n$free_mem\n0\n$host\n";
  } elsif ( $option eq "system_load" ) {
    print "$system_load\n$idle_load\n0\n$host\n";
  } elsif ( $option eq "user_load" ) {
    print "$user_load\n$idle_load\n0\n$host\n";
  } elsif ( $option eq "idle_load" ) {
    print "$num_processes\n$idle_load\n0\n$host\n";
  } elsif ( $option eq "user_system_load" ) {
    print "$user_load\n$system_load\n0\n$host\n";
  } elsif ( $option eq "cpu" ) {
    print "$cpu_user[$cpu_number[$show_cpu]]\n$cpu_system[$cpu_number[$show_cpu]]\n0\n$host\n";
  } elsif ( $option eq "cpuuser" ) {
    print "$cpu_user[$cpu_number[$show_cpu]]\n$cpu_idle[$cpu_number[$show_cpu]]\n0\n$host\n";
  } elsif ( $option eq "cpusys" ) {
    print "$cpu_system[$cpu_number[$show_cpu]]\n$cpu_idle[$cpu_number[$show_cpu]]\n0\n$host\n";
  } else {
   usage();
  }
---------------------------------------
now all that needs to be done is to configure mrtg.
Just follow the example below and create other entries
for the info you want depending on the graph you want.

#---------------------------------------------------------------

Target[hostname.load]: `/usr/local/bin/mrtgnetload hostname load`
Options[hostname.load]: gauge, nopercent
MaxBytes1[hostname.load]: 500
MaxBytes2[hostname.load]: 2500
Title[hostname.load]: System load of hostname
PageTop[hostname.load]:
System load of hostname
YLegend[hostname.load]: System Load
ShortLegend[hostname.load]:
Legend1[hostname.load]: System Processes
Legend2[hostname.load]: CPU Load X 100
LegendI[hostname.load]:  Processes 
LegendO[hostname.load]:  Load 

#---------------------------------------------------------------

have fun
:)
dmz